# CVE-2026-33810: Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509 > Attackers can bypass certificate name constraints by exploiting case sensitivity in wildcard DNS SANs, allowing unauthorized access via trusted chains. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:** 8 Apr 2026 - **Updated:** 18 Sep 2026 - **Also known as:** ALSA-2026:57126, AZL-82328, AZL-82397, BELL-CVE-2026-33810, BIT-golang-2026-33810, CLEANSTART-2026-AZ32352, CLEANSTART-2026-CL14809, CLEANSTART-2026-GP83852, CLEANSTART-2026-GW80468, CLEANSTART-2026-HB21404, CLEANSTART-2026-PF50810, CLEANSTART-2026-PN22734, CLEANSTART-2026-UX94602, CLEANSTART-2026-UY47455, DEBIAN-CVE-2026-33810, ECHO-0a42-f74b-ef37, GHSA-fv83-x2xw-2j55, GO-2026-4866, MINI-225r-8pqg-gjq7, MINI-22ww-546v-v9m2, MINI-273w-hgq8-8364, MINI-28vj-whgq-6fqg, MINI-2958-mh28-4rv4, MINI-2c73-6937-hmmm, MINI-2f85-qc27-563c, MINI-2f87-3r2p-x4rh, MINI-2fh8-mqpr-284r, MINI-2gcx-3vhr-w2cf, MINI-2jjr-5cp6-9fh2, MINI-2mp2-w89h-w959, MINI-2p3m-575h-mpwj, MINI-2p6p-wj47-8rpx, MINI-2pm5-mwf6-g755, MINI-2q2p-4jc3-2xf9, MINI-2rwg-3j39-64f8, MINI-2vrf-53wg-6x27, MINI-2w72-h8qq-mw2w, MINI-33hw-m3rj-fmmh, MINI-33qf-679r-8gc9, MINI-35pc-hvxw-h8wq, MINI-35pq-rfcm-3pgg, MINI-36pr-6mw6-qhmp, MINI-38g6-g969-xxh5, MINI-38jj-7hx2-v2ch, MINI-3953-8qh5-f6cw, MINI-3gfm-48h8-f4j5, MINI-3gj3-h89m-2vwx, MINI-3jfp-c5cq-pg3v, MINI-3jj3-7jm6-299g, MINI-3jr6-x4xf-g4vg, MINI-3mc3-6qcv-w348, MINI-3qg4-h9fx-cj97, MINI-3qh8-f7g4-5528, MINI-3qhc-p9r5-ff53, MINI-3qw6-95c9-2g8p, MINI-3v64-38gp-w4x9, MINI-3vc6-r8gj-p7jh, MINI-3vcc-rc4f-67mm, MINI-3vfw-vghh-xgcr, MINI-3vh7-68mr-9pgp, MINI-3wgr-77xm-m4rf, MINI-3wpq-3cmp-h759, MINI-3xqc-rmg2-p47g, MINI-42m7-mc7r-ffh2, MINI-443x-pppp-5f7q, MINI-44x2-4m7c-m7vv, MINI-46rf-gjwp-cffm, MINI-46x9-q38x-42q4, MINI-47vh-qqmq-32j5, MINI-48pc-jcqf-hx7g, MINI-48xv-vpgm-gwqg, MINI-49g2-w2rr-cjwq, MINI-49h3-2m6x-gfqx, MINI-4f8v-88mf-3cc5, MINI-4g69-fqpr-frmw, MINI-4g8h-rg25-qm3h, MINI-4gcc-ffm6-3q89, MINI-4ghp-8jhj-ggrp, MINI-4gmm-f5xg-r53f, MINI-4gq7-r2wg-gjvf, MINI-4grq-phj7-jg2q, MINI-4h55-m38v-wrg5, MINI-4j8p-2q9j-p5w5, MINI-4jvg-m824-xcxc, MINI-4jwc-v6cx-w54m, MINI-4mh6-pq3g-2rm2, MINI-4mwh-m97w-6mh3, MINI-4q32-j7xq-cm9v, MINI-4qcw-6f4p-3qwq, MINI-4qq3-wm76-xv46, MINI-4r63-24f7-2v82, MINI-4rhw-hvh8-cx28, MINI-4wg7-xq7j-pgg3, MINI-4wvq-2q6q-jvh3, MINI-52jf-3639-w4q4, MINI-53xf-7g6h-r7j9, MINI-54xq-jvq2-qjxx, MINI-56q7-8rhm-j5fc, MINI-57q8-2gcv-gv8r, MINI-595x-vq25-xf3x, MINI-59rp-c3h4-fww7, MINI-5fq9-2wxm-hg9w, MINI-5fqv-3xx3-hgc9, MINI-5frc-7cx8-6mwr, MINI-5gf5-23hj-hhmq, MINI-5j79-x5hv-f8jg, MINI-5q7c-hjf3-9f5h, MINI-5v6w-r55q-h7p8, MINI-5wgv-crw3-rx73, MINI-5wv4-h7gf-gf2q, MINI-5xc8-mg2r-9q4v, MINI-648p-hx54-xgj6, MINI-65p6-r774-45rp, MINI-66cq-96mq-x3g5, MINI-66m8-968w-gqcr, MINI-66wm-q8hv-wfv4, MINI-67c8-grwx-qh8f, MINI-67wf-3mg3-fjjp, MINI-68fq-4q5w-m6w2, MINI-6958-vrq4-2r7g, MINI-69c6-6388-pfrc, MINI-69h8-fw26-hxcv, MINI-6c9x-xc6p-qmxq, MINI-6cqw-pm3v-5j7p, MINI-6cr8-h95f-mw27, MINI-6f8q-9429-39vw, MINI-6f9p-8vp7-v8fr, MINI-6fcg-mc52-6pfg, MINI-6fxg-x9c3-x3fv, MINI-6h7m-r2qg-44j6, MINI-6hqf-3j8f-pm5w, MINI-6j7v-3w88-w82g, MINI-6j8h-jf87-3qqj, MINI-6jg2-rv7h-39xf, MINI-6jxj-8246-2r9j, MINI-6mcc-j5wp-gw5j, MINI-6mf2-v7vv-hj3j, MINI-6mgh-xvc3-q7j3, MINI-6v99-f5qx-44qm, MINI-6vph-fwff-qcmx, MINI-6vq8-g5j8-x87g, MINI-6wxp-46jr-ppqj, MINI-6x82-7rrq-h86x, MINI-725q-286r-xhgg, MINI-727r-5g6h-rqph, MINI-746j-p89v-gm4x, MINI-74mv-4wfg-r7j6, MINI-758q-g3w3-v9g8, MINI-785q-2mjr-9fj2, MINI-78hg-f4qx-92qp, MINI-79mq-q36g-5h6f, MINI-79rw-fcr5-mfc8, MINI-7c25-5h3h-qfgw, MINI-7ch8-qph2-xmx2, MINI-7fw2-fjp5-2pj8, MINI-7grj-6fff-rqvc, MINI-7h98-2f36-55mc, MINI-7hcw-9xh4-pwhh, MINI-7mhq-43cx-8j7f, MINI-7mjm-h9j8-2c57, MINI-7p6w-qhrf-c927, MINI-7pfc-r4mv-986m, MINI-7q2g-rxv4-9vwp, MINI-7qhv-w4g3-9r5c, MINI-7qxr-pp38-j8xc, MINI-7r4g-r82g-fc87, MINI-7r64-862x-q9mg, MINI-7v89-7jm6-j42r, MINI-7w3v-xvv2-x38j, MINI-7w4j-r85v-4wmx, MINI-7w5m-mmg6-x5f7, MINI-7w94-q2h8-8wjg, MINI-7wvw-wqgj-4chm, MINI-8226-x3hp-8w8x, MINI-82c3-3472-pv32, MINI-8359-cmjp-c2w7, MINI-837r-fwj5-wggh, MINI-8545-p952-qx96, MINI-85rx-wr5v-jrxr, MINI-8735-wjj3-f93p, MINI-87m5-6jcj-5wfx, MINI-8829-m3h9-q935, MINI-8846-c887-jwjr, MINI-89pp-w7ph-6jwg, MINI-8c67-9jcj-4vrp, MINI-8c6m-83xg-55jj, MINI-8ccj-j2gp-4w87, MINI-8ch8-4fp6-qmqv, MINI-8cpm-vf25-fp3v, MINI-8gwx-96h3-jj26, MINI-8j7h-3p6x-wp5v, MINI-8jq4-9hqr-hcq6, MINI-8q5h-5rm7-8cqq, MINI-8qcm-cmw2-gxcv, MINI-8r6g-mc5g-3742, MINI-8rf4-hhmf-273c, MINI-8rhq-4rr3-hpmr, MINI-8rx7-j7q2-77r7, MINI-8w8x-f5q6-hwvf, MINI-8x67-7xc7-mvm8, MINI-927h-6j9v-68mq, MINI-92vx-g33w-27fw, MINI-93mm-xgfj-39q7, MINI-94g6-4x4x-5h2r, MINI-94r4-27cw-4rrc, MINI-95vm-8v5r-g2jf, MINI-96xx-r2qr-6gqg, MINI-97qw-6r2g-464c, MINI-989h-qv47-jw99, MINI-99j9-pp58-v7m8, MINI-99wv-7qg3-j283, MINI-9f9c-x8q3-4whm, MINI-9g4q-rx54-2r4r, MINI-9gcj-gjq6-h86m, MINI-9h39-rx9g-4cjw, MINI-9h6f-xqp3-4r8v, MINI-9h7x-cg59-8g44, MINI-9j2j-qpp7-wgxq, MINI-9p45-hvhw-4x88, MINI-9pcm-v6vh-4hw7, MINI-9pwr-w227-68qh, MINI-9qcf-9vqq-vm74, MINI-9r4f-733m-8xq9, MINI-9rcj-2xxm-phch, MINI-9v5r-rj28-35f6, MINI-9vc5-j5qj-j69p, MINI-c2ph-2gq5-mr4q, MINI-c5c3-hm9p-x2mf, MINI-c5v3-6wgw-fvf3, MINI-c788-63h8-87gr, MINI-c83q-jx4f-vwc2, MINI-c849-384j-69pc, MINI-c8cw-9v76-5q4j, MINI-c8x4-5rrh-jj3j, MINI-ccwq-7r9q-fjqw, MINI-cfmp-mp7g-wvc9, MINI-cg6h-9p9f-vvmq, MINI-cghp-w3g6-59q7, MINI-ch98-7q7h-958c, MINI-cjmr-4xr9-hf42, MINI-cpfp-rpg4-mjfj, MINI-cq58-v79w-j4f3, MINI-cw97-p7x3-xm2q, MINI-cwvv-g6wp-595f, MINI-cxqr-53fh-fxcc, MINI-cxrc-xfhv-cg3p, MINI-cxwm-8hf8-wmc2, MINI-f229-c993-59rj, MINI-f2hm-9684-8ww7, MINI-f3jj-7f5v-2vgh, MINI-f3r3-m7xv-39jv, MINI-f475-xh67-4v4m, MINI-f4x7-p9px-8m5f, MINI-f59m-5rcv-9c9q, MINI-f5q9-f986-w32g, MINI-f654-8m79-6243, MINI-f68r-q9hw-r64c, MINI-f79w-6fx8-523j, MINI-f7rp-5rwq-4f6r, MINI-fcxj-w32w-jfpw, MINI-ffpj-52gh-5rjq, MINI-fg4f-83mg-vr5q, MINI-fg66-rqpx-8rxv, MINI-fgvf-gxf7-qq34, MINI-fhrg-6jpp-8xx7, MINI-fmfw-58cg-9fcm, MINI-fmm9-rxxj-84qx, MINI-fmp7-pmwh-j889, MINI-fmw3-hjx4-49j9, MINI-fp33-wrm8-g47g, MINI-fpx7-rpv3-53c7, MINI-fq85-68c4-hcm4, MINI-fq9g-3m43-cvqh, MINI-fqqm-m2wr-w7q6, MINI-fr3c-xh93-6gjr, MINI-frg3-g54q-7c5v, MINI-fx3v-wfch-7f95, MINI-fxmh-h39r-9v95, MINI-fxqw-5q7v-7jqm, MINI-g2pv-vfxx-wv28, MINI-g3g9-88gx-3v8x, MINI-g4jx-2p4r-jqjc, MINI-g55q-pvj7-6672, MINI-g577-9wj4-5q8x, MINI-g59c-h6ww-cr8r, MINI-g5v5-5pch-9pvc, MINI-g6gj-r5w4-9wc5, MINI-g6r3-xvgh-5f6c, MINI-g7j7-hmcf-2x2j, MINI-g86w-rhgj-q5vr, MINI-gc45-986v-v6p9, MINI-gcq4-6hxf-vg3v, MINI-gcv3-4wj4-9prg, MINI-gfg9-r92h-cfxg, MINI-gggf-w994-w3r2, MINI-ggqj-7q86-wpfw, MINI-gh53-837c-grrr, MINI-gh83-78c9-rw82, MINI-ghg6-v3gj-453g, MINI-gjmv-9jpq-r53w, MINI-gmfj-5f29-qrxw, MINI-gmq7-38xr-g2vh, MINI-gq35-wh8g-rq8g, MINI-gqgp-9rwq-3v4v, MINI-grmm-hwv4-fffv, MINI-grrh-3phg-3f8j, MINI-gw62-fvjf-2mpf, MINI-gw6r-hp8h-fwg3, MINI-h2q6-qg96-68jr, MINI-h2v2-2698-8m2w, MINI-h45v-f9c5-fq44, MINI-h4wg-2wf2-998r, MINI-h5gf-4rjx-v23w, MINI-h63w-hcqv-8wc8, MINI-h6hf-58h5-p78c, MINI-h7m8-3q55-w8cw, MINI-h87j-c247-25mh, MINI-h8fc-4hwx-5pmf, MINI-h9g6-hp6f-xwvw, MINI-h9j4-3586-p26x, MINI-h9qh-79qq-g66p, MINI-hcmw-2hgj-54qh, MINI-hf6x-pf36-5pqx, MINI-hf82-p379-89g9, MINI-hf9v-p3hv-cqjq, MINI-hfq2-g92v-8wx3, MINI-hg27-j8j2-72h3, MINI-hg7q-xgf2-qpcr, MINI-hhv4-q493-3jm8, MINI-hjm7-5cg7-p39g, MINI-hmhc-49c7-hmf4, MINI-hmp7-fg9j-gv3h, MINI-hp4c-pw75-868w, MINI-hq7v-h6rh-3qfh, MINI-hrp5-5f9r-x568, MINI-hrqq-vhfv-7x96, MINI-hv8w-xqh6-53gh, MINI-hwxp-gw58-366m, MINI-hx34-v483-29gg, MINI-hxcv-x5hh-q939, MINI-j3vh-38h9-f433, MINI-j4vv-v89c-m42q, MINI-j5vx-xv6f-p3gf, MINI-j62j-xxmm-6xc6, MINI-j84h-97fh-6p7h, MINI-jc5x-hrvv-cv88, MINI-jfxv-x7x9-wm3g, MINI-jh4m-f8mw-fm58, MINI-jm4g-xg59-vjwp, MINI-jp97-cm78-pv35, MINI-jq5h-c4jh-m9hp, MINI-jqg9-g745-3x9g, MINI-jqjw-cg3q-xjcw, MINI-jw62-4gmr-hhwm, MINI-jwpf-4gcq-54vr, MINI-jwxx-m67m-qr67, MINI-jx54-c2p7-r98x, MINI-m275-4r97-2rvg, MINI-m33j-4q7c-rvgq, MINI-m3mf-6gxm-8878, MINI-m49r-6j7v-6fgx, MINI-m4g3-78f2-fqmr, MINI-m4hm-g394-h4rh, MINI-m58g-4p86-8wwc, MINI-m5ch-7xwc-355g, MINI-m69h-v6qr-6q4f, MINI-m6c4-gv23-mp73, MINI-m6f7-g4c4-5xpv, MINI-m94h-cpqv-5x77, MINI-mcxg-r4v5-ccmr, MINI-mfm7-fq5r-gw4r, MINI-mh5v-72q8-jrc3, MINI-mh8x-8ph8-759r, MINI-mjcj-c7gq-66j7, MINI-mv85-7gxj-3gfg, MINI-mv9m-xhc6-r7h3, MINI-mwv9-qjxg-9fxp, MINI-p3pf-xj97-h222, MINI-p4mc-985h-mx3q, MINI-p528-v3rp-fcg6, MINI-p57c-mfr2-qhx6, MINI-p5g6-mf58-vmhr, MINI-p5h9-xfqv-jr4c, MINI-p6j3-mw8q-986f, MINI-p6r5-w8v8-mmc6, MINI-p7g5-r449-hmfx, MINI-p7rm-hv56-v37g, MINI-p7wp-r79m-m38v, MINI-p859-7xjg-w8xx, MINI-p8x5-gpx7-24fr, MINI-p8xp-m4mm-frf9, MINI-pc6p-23q8-6hcq, MINI-pcmh-pwcc-f966, MINI-pf7g-238c-3mqw, MINI-pff7-738m-m6p8, MINI-pg87-crxg-29p5, MINI-pg89-wffw-c4pf, MINI-pgjq-r45h-65r9, MINI-phgm-6j4g-qq22, MINI-pm36-h4qx-vw43, MINI-pppj-8xwh-wmrv, MINI-ppq5-6j7c-gmhv, MINI-pq33-vwf5-v6vc, MINI-pq7q-r9mp-5hwh, MINI-pr8j-45hw-hxv5, MINI-prwg-99gc-p6h3, MINI-pv49-xr3j-453q, MINI-pv7v-pm7g-6pcw, MINI-q27h-6hh4-436g, MINI-q28h-32h7-cj28, MINI-q2c3-j86m-v959, MINI-q2pf-xvff-xm46, MINI-q446-m4hr-vwxq, MINI-q466-pvw9-h736, MINI-q4f7-38hh-q38p, MINI-q4w8-v429-gfmv, MINI-q579-9qpc-8cfg, MINI-q5gq-h2v8-rh9w, MINI-q5w8-3c83-39f3, MINI-q74x-ffjg-59j4, MINI-q7rm-944c-fm88, MINI-q848-5g35-6gqp, MINI-q879-4477-xph5, MINI-q8pf-9w2v-jw54, MINI-qcjh-qw47-fww2, MINI-qfvh-4mpj-v37r, MINI-qg3v-pjc8-6j36, MINI-qg52-f668-r3m7, MINI-qhmf-c39x-hrg9, MINI-qjp9-qvjw-9p5q, MINI-qjqw-8qgg-wh5c, MINI-qm4r-7hpj-q68r, MINI-qm5c-gjjj-f937, MINI-qprv-36q2-pwq7, MINI-qr23-3j52-vx66, MINI-qr5r-p2qj-g3fh, MINI-qrjw-2rv5-rq4f, MINI-qrvj-vmw6-q6r7, MINI-qrvr-mg57-qm5j, MINI-qv4q-xc8g-27pc, MINI-qv8m-5xww-6693, MINI-qv9g-h38m-jvc2, MINI-qvjm-6q9r-rmv9, MINI-qvjw-h23m-2pcm, MINI-qw9f-g872-256q, MINI-qxrc-wgqw-v799, MINI-r3mh-9f6j-59fp, MINI-r4hg-qmm9-5hq8, MINI-r5c3-gpq3-3p7f, MINI-r5qf-23jj-j8mv, MINI-r679-4fq8-gqfv, MINI-r6cg-j944-v57m, MINI-r79v-2hxv-6cw2, MINI-r7cq-9vm9-85r8, MINI-r7h7-9j35-9c9m, MINI-r84m-427v-7852, MINI-r8ch-p7q6-xgpg, MINI-r994-hhf5-8ppw, MINI-rgg5-rf8g-whfc, MINI-rgwf-8vx8-p592, MINI-rj36-q676-4mmr, MINI-rj98-4g4h-vcm8, MINI-rjc4-rh8x-64rc, MINI-rm46-5xm6-4c6v, MINI-rmg3-9g8x-hqxf, MINI-rpr7-gwxf-cr8p, MINI-rpwf-wjgw-h2jv, MINI-rq45-7j37-6f4h, MINI-rq5p-jw4c-6ww7, MINI-rq76-rffh-gpm8, MINI-rqwp-62cp-4wp8, MINI-rr42-h2xx-3pfm, MINI-rrc5-wm46-92wg, MINI-rv57-9j2h-gmc3, MINI-rwmj-7h56-qg7g, MINI-rx6q-h494-7x9q, MINI-v2gm-8fgc-4j25, MINI-v392-23x6-6xm7, MINI-v3g6-7x46-qvp9, MINI-v4wc-g5xv-g7wr, MINI-v644-2wh3-3rv9, MINI-v6hh-pf76-c6h8, MINI-v6vw-4xx9-hq6m, MINI-v7jc-35pp-v5gx, MINI-v8v8-xm3j-xgw6, MINI-v95r-hm34-wgr8, MINI-v9f4-9gpq-w4h7, MINI-vf4w-gvf4-mpf9, MINI-vg36-cf6r-rp96, MINI-vgm9-cj5q-q9wq, MINI-vhx6-5r2h-3863, MINI-vjpg-jphr-5xc8, MINI-vm5r-r947-3cjw, MINI-vm8r-qwjq-c47x, MINI-vpqq-gc8x-9hr5, MINI-vr5r-hv8p-8vvj, MINI-vr6g-66g2-4h7w, MINI-vrj2-wp4p-6487, MINI-vwg2-hr7h-wx7c, MINI-w28h-g7cr-5vqx, MINI-w594-37vj-3252, MINI-w6rj-32j8-j6p5, MINI-wcfg-r5p9-mvgr, MINI-wf4f-vm2h-7cr2, MINI-wffm-v4r6-7672, MINI-wfph-w7wm-m4vr, MINI-wgj5-qhp8-8vfr, MINI-wj3c-qcw6-v7pw, MINI-wj96-3m4c-p5cm, MINI-wm7c-ffx8-qgxj, MINI-wpf9-vjjp-5j74, MINI-wq8c-9c97-f9wg, MINI-wr9g-gw26-437g, MINI-wrcm-pcjj-vvcj, MINI-wrx7-mwcf-7f7f, MINI-wv44-xmg9-wjr2, MINI-wv5h-36rx-v23v, MINI-wv6h-jfcm-57fg, MINI-wwhr-22p3-frm4, MINI-wxmj-g56c-87wf, MINI-x264-vr34-mj66, MINI-x2qw-w64x-9mj2, MINI-x2v4-7f4w-p84x, MINI-x37p-g9r5-8jpj, MINI-x3rq-vvcc-5x49, MINI-x3w9-3vrm-2hxw, MINI-x5gq-4f3r-wqwm, MINI-x7hr-r477-2pwf, MINI-x7r2-xrr9-qghf, MINI-x8g3-9h92-89xp, MINI-x98f-7j8c-qhgw, MINI-x9ch-vq9j-wp3m, MINI-xcpr-gxcp-4g23, MINI-xg64-5r22-72r7, MINI-xj6q-8qc9-wrmw, MINI-xj6r-ghpw-c7j3, MINI-xjw8-p93q-jggm, MINI-xm95-3vwc-g68r, MINI-xpfc-54jv-g96m, MINI-xpr7-66xj-hmfw, MINI-xq89-hpr9-w66h, MINI-xqcg-x4xg-4hjv, MINI-xqhm-7ghc-pfwc, MINI-xqxp-gp2m-x987, MINI-xrhj-x7p5-hqr5, MINI-xrm2-442c-6w42, MINI-xrrm-w6gg-wgqq, MINI-xv7f-3xg8-2qmp, MINI-xvg6-9m2r-693c, MINI-xvh2-878p-83fg, MINI-xvwj-7p9v-c9xp, MINI-xwg3-j2rr-q9r4, MINI-xwgx-xxfw-398w, MINI-xx9v-f8vx-h36m, RHSA-2026:57126, RHSA-2026:67134, RLSA-2026:57126, UBUNTU-CVE-2026-33810 ## What is CVE-2026-33810? CVE-2026-33810 is a high-severity authentication bypass vulnerability in Golang Go, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool. Weakness: CWE-295 (Improper Certificate Validation), CWE-1289 (Improper Validation of Unsafe Equivalence in Input) ## Which versions are affected by CVE-2026-33810? 2 open source packages ship an affected version, including golang and stdlib. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `golang` | Bitnami | From 1.26.0-0 | 1.26.2 | | `stdlib` | Go | From 1.26.0-0 | 1.26.2 | | `yggdrasil` | AlmaLinux:10 | All versions | 0.4.9.2-1.el10_2.2 | | `yggdrasil-devel` | AlmaLinux:10 | All versions | 0.4.9.2-1.el10_2.2 | | `yggdrasil` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.4.9.2-1.el10_2.2 | | `yggdrasil-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.4.9.2-1.el10_2.2 | | `yggdrasil-debugsource` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.4.9.2-1.el10_2.2 | | `yggdrasil-devel` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.4.9.2-1.el10_2.2 | | `yggdrasil-examples-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.4.9.2-1.el10_2.2 | | `yggdrasil` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.4.7-6.el10_0 | | `yggdrasil-debuginfo` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.4.7-6.el10_0 | | `yggdrasil-debugsource` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.4.7-6.el10_0 | | `yggdrasil-devel` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.4.7-6.el10_0 | | `yggdrasil-examples-debuginfo` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.4.7-6.el10_0 | | `yggdrasil` | Rocky Linux:10 | All versions | 0:0.4.9.2-1.el10_2.2 | Products: Golang Go. ## How do I fix CVE-2026-33810? Upgrade golang to 1.26.2 or later. ## Is CVE-2026-33810 being exploited? There is no known exploitation of CVE-2026-33810 in the wild and no public exploit code. ## Other vulnerabilities in Golang Go - [CVE-2020-0601](https://insights.sbomify.com/CVE-2020-0601/): Microsoft Windows CryptoAPI Spoofing (high 8.1, exploited in the wild) - [CVE-2026-27143](https://insights.sbomify.com/CVE-2026-27143/): Missing bound checks can lead to memory corruption in safe Go in cmd/compile (critical 9.8) - [CVE-2024-24790](https://insights.sbomify.com/CVE-2024-24790/): Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses in net/netip (critical 9.8) - [CVE-2023-39320](https://insights.sbomify.com/CVE-2023-39320/): Arbitrary code execution via go.mod toolchain directive in cmd/go (critical 9.8) - [CVE-2023-24540](https://insights.sbomify.com/CVE-2023-24540/): Improper handling of JavaScript whitespace in html/template (critical 9.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-33810 and fix it if it is affected. What it is: CVE-2026-33810 is a high-severity authentication bypass vulnerability in Golang Go, published on 8 Apr 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-2026-33810 in the wild and no public exploit code. Affected packages and fixed versions: - golang (Bitnami): affected from 1.26.0-0; fixed in 1.26.2 - stdlib (Go): affected from 1.26.0-0; fixed in 1.26.2 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-2026-33810/ (Markdown: https://insights.sbomify.com/CVE-2026-33810/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33810 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33810 - OSV: https://osv.dev/vulnerability/CVE-2026-33810 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-33810/ Summaries are generated and may contain mistakes; the official description above is the record.