# CVE-2026-39831: Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh

> Attackers can bypass physical touch requirements for FIDO/U2F security keys in Go SSH, enabling unattended authentication.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 22 May 2026
- **Updated:** 22 May 2026
- **Also known as:** AZL-87173, AZL-87206, AZL-87281, BELL-CVE-2026-39831, CLEANSTART-2026-CE49224, CLEANSTART-2026-CF84977, CLEANSTART-2026-DF11859, CLEANSTART-2026-EN30370, CLEANSTART-2026-HN45424, CLEANSTART-2026-PF01385, CLEANSTART-2026-PG51733, CLEANSTART-2026-SC37753, CLEANSTART-2026-SR68419, CLEANSTART-2026-UP46594, CLEANSTART-2026-VH09965, CLEANSTART-2026-XW40500, DEBIAN-CVE-2026-39831, ECHO-ddfd-3f0e-23e9, GHSA-89gr-r52h-f8rx, GO-2026-5019, MINI-22xv-7wr9-rq3h, MINI-23fg-xrx4-ww8q, MINI-24fx-x3c7-5xjh, MINI-24m7-784p-grf6, MINI-254j-m6jp-c6cq, MINI-2557-x98r-jcqp, MINI-25hw-9xc3-2q24, MINI-262h-f823-29g7, MINI-265g-xf59-c75x, MINI-2679-px45-84qr, MINI-26j5-jm53-2768, MINI-277g-6g4q-6fw6, MINI-27h7-hm43-rw5x, MINI-28j3-87fr-7wcg, MINI-28vc-8385-r4j7, MINI-298h-x9jg-gpwr, MINI-29c4-2vg7-r32r, MINI-29j6-7px3-r7wr, MINI-2cc9-fvjq-pgf8, MINI-2f8j-7fq5-vxf7, MINI-2fcw-j62j-3v66, MINI-2ffq-fw54-vrrr, MINI-2g6x-xhxm-2rfj, MINI-2gp8-6xmm-5pw3, MINI-2gx7-cwhh-p4g7, MINI-2h8w-3jf7-ccq4, MINI-2hrc-rg97-rpx2, MINI-2hw3-v674-hqxv, MINI-2j72-pwhw-m5qj, MINI-2mmf-56xw-cpx4, MINI-2p77-q29q-v8w9, MINI-2pc3-cf3r-mj3v, MINI-2pgf-jh83-8f75, MINI-2qqc-2rwx-w93f, MINI-2r2f-pgm3-6rcq, MINI-2rx6-mwfp-8r64, MINI-2v4q-66g7-rjw3, MINI-2vw5-r2pr-3p3w, MINI-2w4w-3w2r-wvgj, MINI-2w58-9cpx-2578, MINI-2w6f-www4-234j, MINI-2w7c-829h-wg9m, MINI-2wm4-9mhj-4jfm, MINI-2wxr-vrvm-qv58, MINI-2x27-xp4g-wp2m, MINI-2xj2-hv89-c5vh, MINI-337x-77j9-j5vj, MINI-338w-hxr7-5jjp, MINI-33cw-3963-mwvp, MINI-33qj-g39j-4pv4, MINI-33v5-hvc5-6vmr, MINI-33w6-3g9f-6pjm, MINI-33wh-29c8-hcr4, MINI-345r-9g28-7fhr, MINI-346p-fxvf-33x2, MINI-3522-8rhq-rwf6, MINI-356m-55rh-9fm2, MINI-357r-9frf-782h, MINI-35c4-c9gm-v845, MINI-364m-993g-xghv, MINI-3695-c7gf-57hg, MINI-369p-95v3-gh37, MINI-36cm-m4jh-xwqh, MINI-36v8-j5rj-g7g3, MINI-3732-pg6w-793c, MINI-375g-j29j-m9hf, MINI-376c-j6jh-28x5, MINI-377q-698c-2jfp, MINI-37pj-vvh9-2vgm, MINI-385x-jpr2-hmm2, MINI-38jg-v25x-37wg, MINI-39w2-fv6c-jj4j, MINI-39wh-xhj6-93mh, MINI-3c2x-474p-f267, MINI-3c75-3p97-hcgf, MINI-3ch7-3hrc-9gcm, MINI-3cmg-9f9g-4p25, MINI-3cx8-2mpf-cxm4, MINI-3f3r-x2g9-mqwg, MINI-3f99-x6mh-q4x3, MINI-3fr9-jq5m-83rr, MINI-3g4f-c7ch-ffrh, MINI-3g82-hrjp-889p, MINI-3ghg-x8cw-2gqm, MINI-3j55-pp7q-964f, MINI-3jph-jp44-c9j4, MINI-3jq3-7f4m-28jq, MINI-3jxw-ww9w-j2wc, MINI-3m27-rrqv-mhcg, MINI-3mvj-8jgr-gx3p, MINI-3mwg-5jqx-h3x6, MINI-3mx2-482m-x834, MINI-3p9c-p7fr-8fm5, MINI-3pjh-mr2q-g7vr, MINI-3ppr-qcc5-q52r, MINI-3qc8-pf5p-v32f, MINI-3qv6-vm2h-q8rg, MINI-3r6v-w4j8-frx5, MINI-3r7w-jg76-8rgm, MINI-3rgg-359x-qhr8, MINI-3v55-j4h7-p4rm, MINI-3vvm-h8jm-c45j, MINI-3xr3-62qv-fgg4, MINI-4264-xq57-3322, MINI-426f-226c-6vf3, MINI-42hc-vwgf-2f26, MINI-434j-7wfg-7g72, MINI-446c-vr9x-x5qw, MINI-45j6-w483-jqqw, MINI-45q7-8j47-vqhc, MINI-46g5-jfrw-p2xm, MINI-46mc-xmvx-c8r6, MINI-46rw-5qv9-7jhp, MINI-46v5-2xpg-3c34, MINI-47gq-5qh9-6vpg, MINI-47h3-584f-823w, MINI-485g-cq28-4fr6, MINI-486j-q562-9j8q, MINI-49fp-84p7-82cj, MINI-4fh9-hf2x-6rvv, MINI-4fmx-mg68-9m2g, MINI-4fw6-f4gf-xh8v, MINI-4ggj-89x2-mc3f, MINI-4ggp-p566-w4p9, MINI-4gh7-2g55-9257, MINI-4gqj-7mfx-p8cf, MINI-4hj2-7rp5-h7ph, MINI-4hq6-3448-835g, MINI-4m6j-w93m-7jpg, MINI-4mgq-v3pp-f44g, MINI-4mq7-7rrm-qf57, MINI-4pg4-49g9-7qrx, MINI-4pvh-r5j6-jphh, MINI-4qh2-rx98-r956, MINI-4qmj-cj73-9j3w, MINI-4r2f-34r4-qmw4, MINI-4rxj-g66v-27p7, MINI-4vfm-fx4h-6g4c, MINI-4vhh-4p2v-w9ph, MINI-4vhv-774m-93h3, MINI-4w4j-8vr4-jwfj, MINI-4w6p-h7x9-p3j5, MINI-4w76-6c58-fph9, MINI-4x27-wgmx-xgwx, MINI-4x52-459m-5xp3, MINI-4x8g-xch9-534c, MINI-4xg4-gf3j-56x7, MINI-4xg9-hgcc-36pv, MINI-525p-7f9f-rj4w, MINI-529v-c8qm-fhg6, MINI-52cv-7qhx-c9jv, MINI-5337-v9f9-4xc7, MINI-533h-mw29-fcf4, MINI-53jf-936m-mmm5, MINI-53qh-qpww-9cjj, MINI-5425-f62x-m4vg, MINI-556c-rw9c-8cpp, MINI-55g7-hr8c-x4vv, MINI-55j5-9fj2-7chq, MINI-55w2-h4fw-vrv3, MINI-5659-9858-qvjh, MINI-565r-h35v-6v59, MINI-569r-f99c-mfm9, MINI-574v-mp8v-vhx4, MINI-5762-p32q-mq9f, MINI-576j-88h6-qp65, MINI-5783-w98q-9ph4, MINI-57hc-qpxw-ggjq, MINI-57pv-5cwr-43g8, MINI-57w9-f55p-9rq8, MINI-586h-p6p6-qj5j, MINI-58xh-qrqf-88mr, MINI-597q-6qmx-cm47, MINI-59fv-fj4v-742x, MINI-59g4-f3wg-cchv, MINI-5c4v-p3v5-wm5x, MINI-5c59-ph7j-p223, MINI-5cfm-7939-8mgc, MINI-5f2p-6444-hrch, MINI-5fg2-w76p-669q, MINI-5g49-xhq8-6f4q, MINI-5ggq-9hq8-6fq6, MINI-5h4c-cq6x-263g, MINI-5hcf-jg5m-7rv6, MINI-5hg7-fw85-fwfc, MINI-5j99-ff63-3vch, MINI-5jfv-f7r2-5wcr, MINI-5jp7-wc6q-wqmh, MINI-5jqq-hfc7-m2c7, MINI-5m3c-7wrp-wcmq, MINI-5m54-422j-828g, MINI-5m7c-hq9w-4h8f, MINI-5p2j-v5m9-rjv6, MINI-5p92-mw4v-f7v7, MINI-5pfc-c4vp-hrrh, MINI-5pfv-6rr9-9r4h, MINI-5pv7-m962-w493, MINI-5q52-5c3g-63pj, MINI-5q97-q7j3-g832, MINI-5qf7-x2fc-2vrv, MINI-5qgv-3r2p-h33j, MINI-5qvh-5crj-p9c5, MINI-5qw8-ppv8-72jg, MINI-5r3v-wjjx-v5r6, MINI-5r84-g5f3-pj27, MINI-5rhw-889c-w5pr, MINI-5rwx-gx2h-39w7, MINI-5v9h-mf32-h64q, MINI-5vq5-q6f6-7qwq, MINI-5x29-vh3g-8pgw, MINI-5xm5-53rj-w358, MINI-5xpj-mc8h-w33j, MINI-627g-xchg-w2jh, MINI-63jv-qwr9-4vv8, MINI-643j-53jh-7h69, MINI-64h4-wr55-fxq8, MINI-6634-3r4h-89r5, MINI-66cx-2qq5-rw55, MINI-66hr-8vh9-fx62, MINI-66hv-x8h7-3x3q, MINI-67v3-gjpg-qrvp, MINI-684x-f3jp-m85p, MINI-68q7-j6f5-64qh, MINI-68qw-mqwj-pqfc, MINI-68r6-3qch-f4vc, MINI-699c-52vv-7359, MINI-69qj-rqwv-9r52, MINI-69vw-3r52-9mq8, MINI-69x7-925h-94jv, MINI-6ccp-79fh-q9q6, MINI-6cgv-256c-4w3r, MINI-6cjm-64p2-4cx4, MINI-6cvr-63c3-rcvw, MINI-6cxh-999p-xmwp, MINI-6ff7-c96x-94w5, MINI-6fv3-fwmv-6f4v, MINI-6g6m-6fhp-qx3w, MINI-6gcp-h839-pq8m, MINI-6h2x-8mwv-3rwv, MINI-6h5q-gw43-4mw2, MINI-6h62-pgxv-76c6, MINI-6hjj-cj88-j65j, MINI-6hwq-cm75-jmvx, MINI-6j4h-95wv-w8fg, MINI-6mgx-p2wx-9h7x, MINI-6mhm-x89p-p7q9, MINI-6p6p-mxpr-j45x, MINI-6p7r-5pp6-qc6c, MINI-6pfw-cxq9-88pj, MINI-6pjm-8w7h-jw87, MINI-6qh7-8fph-f6hj, MINI-6r42-49c2-wrxp, MINI-6rr8-5pqp-3gg4, MINI-6rr8-m95m-w4jj, MINI-6w2h-m573-8fpr, MINI-6w6h-844h-9j36, MINI-6w73-r62r-w88c, MINI-6whh-j845-5wxc, MINI-6wv6-7388-r44h, MINI-6xgx-5v63-m7gc, MINI-6xh2-6r4f-x3qp, MINI-725h-jr66-w39g, MINI-7262-pjw3-wmmh, MINI-72v9-8pqx-wr23, MINI-732h-2q4h-33xc, MINI-733g-gfwp-wj8m, MINI-73cg-hvxw-7qrh, MINI-73f5-gh8r-fqpj, MINI-73ff-26f8-25wj, MINI-73q2-5c26-9h3j, MINI-73v2-r5rq-vcc2, MINI-73w2-2m55-36gq, MINI-7424-878h-9xj9, MINI-744x-6rgp-wxj4, MINI-749v-78g3-x9pp, MINI-74qf-m8wr-p3x7, MINI-74qm-98xm-rxqr, MINI-74r8-2xv2-gpjw, MINI-752f-cvqg-xwgc, MINI-75g3-fjm2-3695, MINI-762q-32hh-m555, MINI-765f-76fq-g8c4, MINI-76mg-24f2-qm9x, MINI-76p2-53rw-r5pm, MINI-7738-cm37-fxh3, MINI-77hp-3gg9-93p6, MINI-77vc-3gx9-wm65, MINI-77xg-mhfc-6qgc, MINI-7895-fhpv-9fjx, MINI-78f9-jqmv-3v5g, MINI-78pc-pq83-5vjj, MINI-79g6-h2vp-ggxw, MINI-79wr-qm93-fc36, MINI-7c2p-9689-9457, MINI-7ccq-8jgh-6cqw, MINI-7f6f-fw9g-xhhj, MINI-7gmr-5mp7-c92g, MINI-7h8m-32qf-qp47, MINI-7hrc-5248-mmcf, MINI-7j8x-967h-87r4, MINI-7j9j-rwpr-2c59, MINI-7j9v-5rhx-6x9v, MINI-7m22-5hv2-8928, MINI-7m2r-vjp7-72r9, MINI-7m74-hjgw-rmqr, MINI-7mcm-p4pr-pf4m, MINI-7mf2-qm2p-jf6g, MINI-7mpx-g7rm-9hp9, MINI-7mv9-7wqh-2cqh, MINI-7p59-35wj-mjp8, MINI-7p95-wwcg-93m4, MINI-7pjp-vc7v-xgff, MINI-7qm9-vvrf-fv3q, MINI-7qq5-g9vh-p84w, MINI-7qq8-r97q-2xfc, MINI-7qv3-8j44-gf43, MINI-7r49-32mx-rp22, MINI-7r92-j455-hrwr, MINI-7rgc-qhqr-hpwr, MINI-7w4m-3c33-vpc3, MINI-7x5p-52w6-87c6, MINI-7x8w-v36m-69mw, MINI-7xc9-6gvx-rrmj, MINI-7xg3-2h8f-ppmc, MINI-7xv4-9mw3-7r2x, MINI-822c-gjr2-3276, MINI-8253-wmgv-m9rr, MINI-827x-vxq6-965w, MINI-82hc-xjrc-8gq8, MINI-82rx-pq3r-q9fx, MINI-82w3-6h9q-6grh, MINI-832x-5pfw-w3p5, MINI-833x-w32h-v8g7, MINI-83c7-fx6j-5rcp, MINI-83g9-44c7-52j8, MINI-83q2-ff62-4hgw, MINI-843j-cw63-7hmx, MINI-8453-hmcw-4c54, MINI-847x-f3hw-3rrj, MINI-8494-28rp-wm56, MINI-858r-4qr6-m2ff, MINI-85hx-jf7j-c278, MINI-85ww-w8w4-qr37, MINI-8687-f634-m8g3, MINI-8687-w3vr-jvwj, MINI-868p-68pm-r74w, MINI-86c6-mh6x-9f6p, MINI-86mv-jvq2-4gpv, MINI-879g-c29m-jmx8, MINI-884f-qm66-8xwf, MINI-8c9x-jxp9-32v6, MINI-8f32-cc8h-wvvf, MINI-8f4r-x2m6-vwpr, MINI-8ffm-6f3q-fpp5, MINI-8fjg-wr5m-jgg4, MINI-8fjx-3jc4-rf75, MINI-8fp6-83rw-43g3, MINI-8fxw-vf8g-v625, MINI-8g2f-4p3w-pvw9, MINI-8g3m-rvrg-29j3, MINI-8gqv-c58j-84xw, MINI-8h9j-v48v-vh7v, MINI-8hvq-3j5h-hrpj, MINI-8j9f-cpq8-prhg, MINI-8jcg-574p-jpcw, MINI-8jgj-58c7-f8wq, MINI-8mc6-w8vc-8jv9, MINI-8mp7-jrq8-hhw3, MINI-8ph4-xp32-c525, MINI-8qp2-6p39-934r, MINI-8qpj-fgp9-5cf2, MINI-8qpr-g6rj-m3pm, MINI-8qq5-q697-wcww, MINI-8qrw-gqqx-w5m6, MINI-8r2m-6gc4-vx2v, MINI-8r2p-rh64-ch35, MINI-8r5p-qq6w-8jg4, MINI-8rcj-pc3h-p89q, MINI-8rg9-73xh-j3f8, MINI-8rpf-hvfj-765x, MINI-8vph-7239-phgw, MINI-8vrm-frww-9753, MINI-8wmc-2p9f-86ch, MINI-8wr6-266w-xv7j, MINI-8wx6-wcxx-r864, MINI-8xhp-7qcw-4vmr, MINI-8xj7-xcxh-98g3, MINI-8xp8-g8h5-hvr2, MINI-8xv5-ffx7-87pg, MINI-92j5-54h5-56mv, MINI-92r4-gmc2-5296, MINI-936g-wwx6-5mg5, MINI-93cq-rjq3-6rf7, MINI-93g9-5492-68gj, MINI-93wc-wwc3-3p5g, MINI-9484-4mc9-c234, MINI-948j-84wj-fcf8, MINI-94r2-qr52-2fch, MINI-94rm-jrr3-45vf, MINI-94v4-34mj-586v, MINI-94v9-hcf7-87hm, MINI-94wg-w923-4c3m, MINI-964p-4r54-vrvh, MINI-965c-659h-jfhv, MINI-96vg-5w9m-6h4c, MINI-9733-xp8h-wq2f, MINI-973m-vv7j-8pw4, MINI-974c-j2v4-x9jp, MINI-97q7-m27j-67jf, MINI-97vq-pm88-q8qc, MINI-97wg-mrj9-4324, MINI-97xv-jjg5-29p3, MINI-985x-h9q2-f48v, MINI-98fr-qq55-hq33, MINI-992f-2r4c-8gc3, MINI-99rj-cjcp-m7xc, MINI-9c54-cc24-j7xf, MINI-9cmp-c4g8-4x2h, MINI-9cx4-wxvp-9p7w, MINI-9ghx-hp63-f5g9, MINI-9gmg-6hhc-w428, MINI-9gv3-3w2g-693w, MINI-9hg9-vgmm-5pr8, MINI-9hx7-vjjc-x9gc, MINI-9j24-g4xq-5m48, MINI-9m29-wgp8-gw2p, MINI-9m2q-r7fj-pv78, MINI-9mc7-p6rq-jj8p, MINI-9mmw-w3m9-q8wp, MINI-9p24-vjq5-cjpw, MINI-9p92-qmrf-jr98, MINI-9pmp-5g7p-ww86, MINI-9v3f-3j3x-wrm7, MINI-9vp7-ch5w-mmc7, MINI-9w67-8qcm-cxw5, MINI-9w98-666h-6cg8, MINI-9x39-f9jq-9xg5, MINI-c269-j46m-cqg7, MINI-c273-36c8-g79q, MINI-c294-wccg-fr3q, MINI-c2mj-xp4w-52wc, MINI-c2pr-3cq4-qjf4, MINI-c48w-3xh8-2qh9, MINI-c5ph-r998-58rp, MINI-c688-v4rq-7vpc, MINI-c6gp-gxpp-gfww, MINI-c7mw-ggpg-gvqq, MINI-c8p6-8h8r-hr9v, MINI-c8qv-v5vj-g6xq, MINI-c9c7-8c9p-9468, MINI-c9mv-3383-7pvm, MINI-c9r4-5fw5-cjch, MINI-c9vc-j3hm-5vgj, MINI-cc78-h493-pxg8, MINI-cc83-3p9g-xp45, MINI-cc8g-fq4p-rjhq, MINI-cch4-4972-qgff, MINI-ccj3-gpcf-r3qf, MINI-ccpv-v6fh-w927, MINI-ccq6-w7h2-v558, MINI-cfmh-29mm-pqxg, MINI-cfpr-8xg6-8w52, MINI-cg4x-jxr9-5g4r, MINI-cgp6-x63x-68mp, MINI-ch93-rvm4-qc68, MINI-chgq-cqrg-cpm6, MINI-chm4-gfh9-hghh, MINI-cm2x-vhrc-7jxp, MINI-cm54-39h3-x752, MINI-cmfg-3xc3-qhw4, MINI-cmg5-67p8-mxr5, MINI-cpc4-vrw5-786j, MINI-cppg-w8qx-32pp, MINI-cpqx-x592-962q, MINI-cq22-vjhg-jm8h, MINI-cq97-9wmq-59wx, MINI-cq9f-9pgm-8h7v, MINI-cqq6-6rvh-9rfj, MINI-crgp-6fcc-grqh, MINI-crqm-hf2h-6g5q, MINI-crr4-wp7w-j6pm, MINI-cv5f-jprx-8f9p, MINI-cv6x-428g-xx74, MINI-cvf5-cpx8-854h, MINI-cvh9-ph5c-rh2f, MINI-cvpq-mhvm-j63g, MINI-cvq6-vpmj-m82p, MINI-cvv4-8h28-phj9, MINI-cvxc-xj8x-3jfp, MINI-cw67-vc74-93x9, MINI-cwg3-g2ww-c64x, MINI-cwhm-f3qm-5h32, MINI-cwwx-3j4q-25j5, MINI-cxp6-6jf5-jx66, MINI-cxr2-c7hf-j4gr, MINI-f234-q7hv-mjhx, 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MINI-rmjx-7pqr-8m23, MINI-rmm5-8jwg-j8q3, MINI-rmmw-3jww-hq26, MINI-rp4c-6qf2-r3vg, MINI-rpc6-m8vf-rv75, MINI-rpmj-6wr5-rm5j, MINI-rpph-598r-h4v6, MINI-rpv6-m23f-9wc2, MINI-rr4q-jqpp-xq2x, MINI-rrcc-ghw6-2c8c, MINI-rrwx-mgj4-ggq3, MINI-rv52-wff6-w4gr, MINI-rvc8-8jqp-8q9v, MINI-rvm2-qvwj-7545, MINI-rvrm-vfvr-6p3r, MINI-rwp9-76rj-8pqw, MINI-rwqc-r54j-2gp5, MINI-rx3f-grm4-vfcf, MINI-rx47-php5-jxvp, MINI-rxg7-r377-xqpw, MINI-v24p-h8pc-xmh8, MINI-v2jp-mcgv-89hm, MINI-v339-fr39-vmvq, MINI-v3fx-wcf9-qq76, MINI-v3m9-jcrj-5jgg, MINI-v3vp-mmf8-5fhg, MINI-v43p-9rqm-hfxp, MINI-v4pg-p46f-8hfw, MINI-v53q-9pqc-898x, MINI-v57x-2q39-ggg9, MINI-v5cp-pxc8-w77w, MINI-v5mv-9v8x-g8wg, MINI-v5mx-6v92-8qx5, MINI-v644-524h-83rf, MINI-v676-3w88-wgq2, MINI-v8rp-hfw6-2mrc, MINI-v9w4-h796-2236, MINI-vc27-qmj7-w8rf, MINI-vf9g-265v-89ph, MINI-vfh3-77hf-4xx6, MINI-vfjf-42f6-7qfx, MINI-vfm2-mxq4-p7jx, MINI-vfq7-j9jr-w4vh, MINI-vfr5-qppp-4hm5, MINI-vg5w-87rx-34jc, MINI-vh7v-347f-fwf6, MINI-vhrh-7m6q-j8h9, MINI-vjcj-935m-3p2p, MINI-vjhh-x96x-cfg5, MINI-vjv7-m52v-3cqh, MINI-vjw3-wm3q-7fmw, MINI-vjwg-mf4v-44c5, MINI-vjxx-3fr6-9fr4, MINI-vm7x-mv9p-4q74, MINI-vm8c-qw9g-qw8m, MINI-vm9c-fv2c-rv68, MINI-vmg4-mv72-q94x, MINI-vqg9-fxp7-vmmp, MINI-vqmc-x87g-9gfc, MINI-vqrc-qhwr-98jp, MINI-vr26-26xp-x79r, MINI-vr3r-v2v6-pcc9, MINI-vr5m-98hq-wrqx, MINI-vr9h-c936-2hfr, MINI-vrf5-hvmw-gc88, MINI-vrvp-g6fj-jgxg, MINI-vvcc-fc42-h6q7, MINI-vw6w-qhf6-6w86, MINI-vw8c-4jpf-4hhq, MINI-vwj8-jc6r-c3vx, MINI-vx26-294r-2p5p, MINI-vx5c-w4gc-7xpp, MINI-vxr8-fp85-c3v4, MINI-w246-8983-vmr6, MINI-w2gj-h35c-h83r, MINI-w2pr-57gh-95mh, MINI-w2xp-gc95-xcqh, MINI-w34g-2r3w-pf5r, MINI-w393-fcwf-vp4q, MINI-w3cw-8527-2rgh, MINI-w3g2-mjg2-gq2f, MINI-w47x-c34w-cxg6, MINI-w495-4c48-h2gh, MINI-w4v8-7prr-6xhv, MINI-w4x6-w2f5-hj4q, MINI-w5g6-x4m2-787x, MINI-w635-xpxc-xxj3, MINI-w64c-xcfc-2v2v, MINI-w6cq-3w64-mhf7, MINI-w6j6-wx4p-8jpq, MINI-w6v5-wpjj-w3p8, MINI-w7cj-cc2q-jxf5, MINI-w84j-8hj2-hfqm, MINI-w8fv-fjgc-4gf6, MINI-w8mh-pfj7-mqv7, MINI-w8rf-94wv-qc6c, MINI-w96q-c79q-m9gg, MINI-w9ch-65cx-mf54, MINI-wc6c-gh6q-vg37, MINI-wcgr-3xm4-g97p, MINI-wf47-hmxf-jq39, MINI-wfg7-wpx6-qh24, MINI-wfjv-pf6q-749w, MINI-wfvc-665w-c8mh, MINI-wg3c-2x9r-46vw, MINI-wg44-8pr3-jmjv, MINI-wh58-f998-rff4, MINI-whgq-rcxc-cqmv, MINI-whj2-3r7c-hjw5, MINI-whrq-gx67-cwjm, MINI-wj78-jqf8-8797, MINI-wm2j-2fqw-fpwx, MINI-wm3j-q359-q47p, MINI-wq9p-fh9m-c7mh, MINI-wqc6-g68h-9g82, MINI-wqh8-cr2f-3wjc, MINI-wrfx-v7f6-3c8r, MINI-wrpv-g47g-8mc7, MINI-wv2j-3cqf-65r9, MINI-wvfj-hcpr-8w94, MINI-wvhv-j32x-96g3, MINI-ww46-pmvp-2372, MINI-wwcw-v54q-8c29, MINI-wwm4-88p2-536w, MINI-wxc4-j5j9-9pcg, MINI-wxc7-3rq7-35vh, MINI-wxh5-fhx9-2c8g, MINI-wxpj-2ch6-2mxv, MINI-x256-323r-94c7, MINI-x27r-mx66-v6vw, MINI-x2gw-4m7p-h59j, MINI-x2rj-p5q3-gvh4, MINI-x2x7-m3fg-xhfw, MINI-x3f3-75c2-p7rf, MINI-x3g9-rgh8-94q3, MINI-x3mq-pwcc-p4r6, MINI-x3p9-992g-75x4, MINI-x3vm-gfjp-4vh7, MINI-x3wv-2gqw-xch8, MINI-x42m-324v-vx8c, MINI-x442-7g3q-732q, MINI-x4hw-fh8f-39jp, MINI-x4p3-37cf-2gfm, MINI-x568-8mpg-v5f7, MINI-x5v9-mgj2-x3wh, MINI-x635-7jjr-7hrw, MINI-x6jc-rx9c-3v88, MINI-x6mx-85xm-qh29, MINI-x87f-hf3w-fffv, MINI-x8f8-85cq-9qfv, MINI-x8fh-wwg6-p65j, MINI-x8pj-gqq9-6c6c, MINI-x8rp-h823-xx7c, MINI-x9cm-hvx4-956h, MINI-x9jf-vx85-26mg, MINI-x9wr-jrj4-46r3, MINI-xc54-p6qm-7268, MINI-xf64-4xcg-6qcx, MINI-xf93-mj4v-8hwp, MINI-xf9w-466q-j9gv, MINI-xfcf-r93q-m96w, MINI-xfg6-xgc8-7vvm, MINI-xg2j-373f-px5m, MINI-xgm4-w4v8-fm9c, MINI-xgpm-vqrp-m25q, MINI-xgxx-q2xg-f9r9, MINI-xh6w-cq7p-82mj, MINI-xhfj-qg2p-rcrv, MINI-xm4x-q5mv-8cwf, MINI-xm5r-36jf-h9ph, MINI-xpcq-x3cx-74mw, MINI-xppf-f752-56jh, MINI-xq3q-375x-j5jh, MINI-xq6m-5xmg-q9ff, MINI-xqqq-vrq9-cccf, MINI-xr49-m85w-9jmx, MINI-xr7r-crg4-g8jq, MINI-xr9m-2876-cfqh, MINI-xrqr-6j6f-mffg, MINI-xvr3-xqqx-j22p, MINI-xvrp-mq7p-j733, MINI-xw46-hxqc-64jc, MINI-xwfq-6v3j-hjjw, MINI-xx92-m847-cq6r, ROOT-APP-GOBINARY-CVE-2026-39831, UBUNTU-CVE-2026-39831

## What is CVE-2026-39831?

CVE-2026-39831 is a critical vulnerability in golang.org/x/crypto/ssh, published on 22 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-39831?

3 open source packages ship an affected version, including golang.org/x/crypto. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `golang.org/x/crypto` | Go | All versions | 0.52.0 |
| `golang.org/x/crypto` | Go | All versions | 0.52.0 |
| `golang.org/x/crypto` | Go | All versions | 0.52.0 |

Products: Golang Crypto.

## How do I fix CVE-2026-39831?

Upgrade golang.org/x/crypto to 0.52.0 or later.

## Is CVE-2026-39831 being exploited?

There is no known exploitation of CVE-2026-39831 in the wild and no public exploit code.

## Other vulnerabilities in golang.org/x/crypto/ssh

- [CVE-2026-46595](https://insights.sbomify.com/CVE-2026-46595/): Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh (critical 10.0)
- [CVE-2026-39830](https://insights.sbomify.com/CVE-2026-39830/): Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh (critical 9.1)
- [CVE-2026-39832](https://insights.sbomify.com/CVE-2026-39832/): Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent (critical 9.1)
- [CVE-2026-39833](https://insights.sbomify.com/CVE-2026-39833/): Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent (critical 9.1)
- [CVE-2026-39834](https://insights.sbomify.com/CVE-2026-39834/): Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-39831 and fix it if it is affected.

What it is: CVE-2026-39831 is a critical vulnerability in golang.org/x/crypto/ssh, published on 22 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-39831 in the wild and no public exploit code.

Affected packages and fixed versions:
- golang.org/x/crypto (Go): affected all versions; fixed in 0.52.0
- golang.org/x/crypto (Go): affected all versions; fixed in 0.52.0
- golang.org/x/crypto (Go): affected all versions; fixed in 0.52.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-39831/ (Markdown: https://insights.sbomify.com/CVE-2026-39831/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-39831
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39831
- OSV: https://osv.dev/vulnerability/CVE-2026-39831

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-39831/
Summaries are generated and may contain mistakes; the official description above is the record.