# CVE-2026-27145: Inefficient candidate hostname parsing in crypto/x509 > An attacker can cause excessive CPU consumption during certificate hostname verification by providing a certificate with many DNS Subject Alternative Names. - **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 2 Jun 2026 - **Updated:** 18 Sep 2026 - **Also known as:** ALSA-2026:46394, AZL-89381, AZL-89384, AZL-98601, BELL-CVE-2026-27145, BIT-golang-2026-27145, CLEANSTART-2026-CF09706, CLEANSTART-2026-GO81749, CLEANSTART-2026-HS88612, CLEANSTART-2026-KA59020, CLEANSTART-2026-KP00708, CLEANSTART-2026-KU01035, CLEANSTART-2026-KY85414, CLEANSTART-2026-LG62775, CLEANSTART-2026-OG70620, CLEANSTART-2026-PD40538, CLEANSTART-2026-RO22308, CLEANSTART-2026-WI78458, CLSA-2026-1783955624, CLSA-2026-1784188646, CLSA-2026-1784190453, CLSA-2026-1784302739, DEBIAN-CVE-2026-27145, ECHO-8efc-c381-6569, GHSA-4279-q6mj-392r, GO-2026-5037, MINI-228f-mpc9-3pj5, MINI-22mc-fgmx-pwpf, MINI-2349-v654-9p99, MINI-2384-hj42-77h4, MINI-239j-6gqr-q78p, MINI-23cc-46v9-mgj9, MINI-24p4-f6wc-gxmc, MINI-24wg-m928-6wcq, MINI-2573-2jhq-vh6c, MINI-268w-4fgh-4f57, MINI-26h8-hpf3-w7g5, MINI-26hc-9rr4-4f7j, MINI-2736-5v6g-6c9x, MINI-27jv-jj3c-r9q2, MINI-28jf-54v6-hv35, MINI-28pp-9qp2-f9w6, MINI-293p-vgjg-wfhq, MINI-2946-ww35-w895, MINI-2993-fjh3-4g2r, MINI-29j4-cq4j-q47r, MINI-29j7-8cmg-2mx3, MINI-29wp-fqp8-vx3g, MINI-2cc9-ff9q-p62f, MINI-2f22-2xm9-8gvc, MINI-2fjm-f3cg-v7vj, MINI-2g5j-6gw8-7863, MINI-2gcc-4p3m-q335, MINI-2gxr-2j9g-ccqc, MINI-2hr6-q6mm-h642, MINI-2j7m-q84j-gf6x, MINI-2jm5-fvm5-7g69, MINI-2jv9-qfpq-hcxr, MINI-2m93-gj4j-rx29, MINI-2p9r-9xgm-xgv4, MINI-2prh-c6w4-x5cv, MINI-2rjv-vj52-j8vr, MINI-2rpw-7p8h-8x9j, MINI-2w2g-f3qx-x5w2, MINI-2wh7-qj5m-76hc, MINI-2xmc-9jpm-5jw9, MINI-3263-wj9h-f629, MINI-33h7-4h3g-vrcj, MINI-33vq-v3mm-v2mx, MINI-3438-pv2m-wr5c, MINI-3495-gqrf-wg98, MINI-34gw-rhjh-3vfr, MINI-34j8-vmg3-h3pm, MINI-34m7-chjg-7cxm, MINI-34q5-qx22-q44p, MINI-34wp-2g4r-gjqc, MINI-355v-3gv2-c393, MINI-35fr-2g5g-p4p9, MINI-36jm-gcxh-5468, MINI-36vh-469m-26x5, MINI-3742-c33r-wqx9, MINI-389q-9x4w-46gf, MINI-38h7-frw3-xq6r, MINI-38qg-7m7w-w46f, MINI-38qq-4pvw-pcx2, MINI-39p3-2rp6-7r6h, MINI-39r2-5h2q-wxw7, MINI-3c56-w36p-38f3, MINI-3cjq-264h-mf84, MINI-3cr4-r58h-4wvg, MINI-3f72-m83q-6jq7, MINI-3gxq-jvwx-9pq7, MINI-3gxw-9g8c-grpf, MINI-3hjp-32qq-gfrr, MINI-3hx2-686c-mj72, MINI-3j2c-fhf7-76wv, MINI-3jg7-jvpx-pp26, MINI-3jgh-87cq-2hfx, MINI-3jmj-v55q-rr77, MINI-3jvw-7rgm-39g3, MINI-3m5x-cqgx-xw7h, MINI-3mfh-mxxx-fj2r, MINI-3mmm-28p5-m2jm, MINI-3phh-qwg3-j9gf, MINI-3q78-p2rg-2xrv, MINI-3qvr-5m9c-fqvp, MINI-3r5v-8354-f6cw, MINI-3r9q-62fc-mhfh, MINI-3vj8-grmf-hvjh, MINI-3w4q-96fp-vhrq, MINI-3w6h-gpm9-2qgr, MINI-3wcq-f625-p25p, MINI-3wf2-2qv2-hh39, MINI-3wgj-j2wj-hvch, MINI-3wgx-cxcv-w3wc, MINI-3wwc-7jmw-48f4, MINI-3x35-6rh6-7m88, MINI-3x4r-j2q2-frjw, MINI-424f-w4w2-r5q2, MINI-4298-wfgf-62ww, MINI-42q8-gmf7-6prj, MINI-42xm-436j-qq2g, MINI-43j6-cjwg-wvr4, MINI-43rr-m962-2x3h, MINI-453h-c22f-fpjq, MINI-464x-2grf-p342, MINI-469j-49jj-x8jc, MINI-46cm-6j23-hwq3, MINI-46mg-3w93-w793, MINI-47qh-fj6x-7jv3, MINI-4843-6h5q-xcph, MINI-48h6-9wx3-wq6r, MINI-48hm-9hrg-xv85, MINI-492r-37xg-gqx6, MINI-493x-rhhj-rgh3, MINI-496c-49cm-whpf, MINI-49mj-qqj3-7cwp, MINI-49pj-7p4p-qf3m, MINI-4c5h-chfq-whcv, MINI-4cfj-757m-7rw6, MINI-4cw5-789r-vxm8, MINI-4f9p-cfrw-4jv3, MINI-4fv9-fvc8-xhfx, MINI-4g23-m6jv-jxhh, MINI-4g2h-vwvc-jqg6, MINI-4gm8-xmw9-x3g5, MINI-4h2v-2wq7-j965, MINI-4hjx-rv2x-jjrq, MINI-4hph-9v7m-g4w8, MINI-4jpc-8c8c-9238, MINI-4mgq-xwrp-4j5h, MINI-4mjf-xwm3-34jc, MINI-4q9x-wv3m-vvcp, MINI-4qh4-hq26-v758, MINI-4qjg-77v5-j445, MINI-4r3g-ww49-2wq7, MINI-4r4m-6f6f-gq24, MINI-4v3p-vw5f-c39g, MINI-4v75-p9vv-8996, MINI-4wjp-fqxg-v963, MINI-4wmq-4fmp-f647, MINI-4x4r-9qq3-g428, MINI-4x6c-8rh4-7432, MINI-4xgm-mmff-rvxh, MINI-523c-98q3-ccx7, MINI-52hf-3754-wp59, MINI-52mm-h833-w5fv, MINI-52mq-r6pv-f88q, MINI-52wp-q4h8-3jvf, MINI-5392-fcvr-v8q7, MINI-53qf-p9fg-9vjr, MINI-54qm-wgmp-xwmq, MINI-54xp-j4hp-8j99, MINI-555r-rrp7-8mwq, MINI-55x2-8fp7-g93f, MINI-5723-c2f9-939r, MINI-57fq-v8q5-wxhv, MINI-584f-3fw2-jhrm, MINI-587q-8xcq-ccx6, MINI-5889-4g3c-xhr3, MINI-58gv-p274-hxmm, MINI-58h7-4274-wfgg, MINI-58rv-r53x-vgx3, MINI-594h-hc86-cwpg, MINI-59fw-f8pm-8299, MINI-5c6g-h579-2pg8, MINI-5ch5-cm59-6p37, MINI-5crx-xmr3-76vg, MINI-5cw8-mwgc-m96m, MINI-5f2r-6mjc-x2hm, MINI-5f77-3cmj-jmxc, MINI-5fg9-696m-wf5v, MINI-5fgr-frrg-9cj4, MINI-5fj6-jfqr-29v4, MINI-5g3m-99c2-r258, MINI-5g3q-pcm3-q346, MINI-5g53-8m9c-vghr, MINI-5h6g-x82g-2r45, MINI-5hg5-8vq6-2wm5, MINI-5hgp-jqj2-fqp3, MINI-5hr7-x849-6xwg, MINI-5j97-4fwh-4ffh, MINI-5m4v-f79q-grc4, MINI-5m5m-6gw3-v9f9, MINI-5m6g-g246-h8x9, MINI-5m74-p229-5wqc, MINI-5mmh-5239-qvmv, MINI-5mp5-7m64-mrqm, MINI-5p6j-pf5q-fv5w, MINI-5p8f-gp67-vf3j, MINI-5q32-qcqf-h66c, MINI-5r9m-jg8r-mfw7, MINI-5rj2-j3v3-gm9p, MINI-5rp6-68wc-pc8h, MINI-5rqm-7wj5-x6f3, MINI-5rqp-wg4x-8vm2, MINI-5v7q-wqx6-8c6h, MINI-5vcr-2qq2-g26x, MINI-5vwj-4mcj-988j, MINI-5wq3-x2wf-mp2v, MINI-5x64-5vw3-wjrp, MINI-5xvq-5f4j-mjj8, MINI-628v-7w8p-h9q8, MINI-62wr-gg7j-xqxf, MINI-632m-5r23-63gh, MINI-6343-p93w-9pq3, MINI-63gw-2xq7-6q8p, MINI-63mp-mpmc-h84w, MINI-6493-h6x6-jvfx, MINI-66cq-2chv-x278, MINI-66fq-xjx7-598p, MINI-66hx-9pc3-jcxw, MINI-66vm-873j-8qm7, MINI-66wj-hq58-rr88, MINI-672f-m5mx-9j87, MINI-6755-28g5-v75q, MINI-676h-mx8x-frf2, MINI-67qf-hwx9-7r4c, MINI-689v-q54x-94gp, MINI-6ch9-vww2-fj6j, MINI-6cpf-46jc-q3fj, MINI-6cq3-qhfc-cfpc, MINI-6f67-jfhq-829f, MINI-6fpv-9c9q-74v7, MINI-6fx4-929q-m5rq, MINI-6g26-8wgp-9qg5, MINI-6gj8-x93c-67w4, MINI-6gq2-p7wf-fp6j, MINI-6m65-9589-vg6c, MINI-6m9x-pw9f-c3g4, MINI-6mh6-cx3x-wmmp, MINI-6mqj-cwvq-rjp7, MINI-6p8r-j75f-7qvg, MINI-6px8-f64p-2w4q, MINI-6q5f-p55w-4rhx, MINI-6r2f-mc8c-479m, MINI-6r6j-rp5w-8jpc, MINI-6rmx-7jrj-f5xh, MINI-6rx3-mpjw-hjjw, MINI-6rx4-jw56-h3vx, MINI-6v93-vgf6-q884, MINI-6vg4-8p3c-mp3x, MINI-6w8h-m883-3qc3, MINI-72hr-qpch-w449, MINI-72jf-q9gm-m4wh, MINI-72m9-g9g5-9p86, MINI-72mw-5732-2www, MINI-72r2-9hjr-4pjh, MINI-72v5-q2fq-6f6p, MINI-72w3-4x2g-7859, MINI-73fx-4p4c-cv4r, MINI-742w-jmm3-7pmp, MINI-758m-8733-hqpx, MINI-759x-9jjh-mvhv, MINI-75mc-mwr9-3vpg, MINI-75pv-m47x-53hp, MINI-764v-4jxw-7cxx, MINI-76f4-84q8-7766, MINI-76g2-rpr6-f3pc, MINI-76wv-vc77-f9jc, MINI-77pq-9gwp-ggv7, MINI-77r5-2g34-7684, MINI-77w9-wgfh-wh89, MINI-78hx-mh3w-qmhc, MINI-78w5-4g2v-w5qq, MINI-78wg-mfq6-rvwc, MINI-792c-crw3-9vh4, MINI-79mm-j6q7-x2gr, MINI-7fjm-9mvx-xcgw, MINI-7fm5-hvrm-3p82, MINI-7fmv-j6c7-qh2p, MINI-7g3w-p22g-8gwm, MINI-7g5c-q493-fh6c, MINI-7g93-mm93-m8hr, MINI-7j79-78f4-fx45, MINI-7jc6-c5j8-5chh, MINI-7jmj-wr9g-xvhg, MINI-7jrv-92vm-h3j2, MINI-7m88-7574-hj7w, MINI-7p58-7ff2-j83f, MINI-7pjw-jxg6-242f, MINI-7pr2-22jq-xv48, MINI-7rqh-p2c3-95rp, MINI-7v4r-4gx9-79f9, MINI-7vqv-84h3-6c2g, MINI-8272-v7c2-7pqh, MINI-8349-rm7r-2wvp, MINI-8352-mwxh-9wr6, MINI-8354-hqmp-f4fp, MINI-845g-p7cj-mqhw, MINI-855f-hj82-99rw, MINI-8567-fj45-9w3w, MINI-85cp-vxrj-96wr, MINI-85qg-87vr-hc95, MINI-85qp-8g8w-hhfw, MINI-85x8-9wrj-4wgf, MINI-867r-r238-hqrp, MINI-86vq-fv5r-qjg4, MINI-86xp-wx8w-6w26, MINI-87qh-98vj-hw42, MINI-88g4-q4f2-2m97, MINI-88x3-65q7-pj36, MINI-899w-3vvg-q5rw, MINI-8f5x-5q94-jh7v, MINI-8fvc-f4c4-2hrc, MINI-8gf5-95m7-rm97, MINI-8ghg-cp24-g6r4, MINI-8jg7-8vw3-h25m, MINI-8jhr-386p-v9xg, MINI-8jxx-gxxw-g7w3, MINI-8m34-8gf3-h289, MINI-8mff-8j5r-3fcq, MINI-8q6j-775x-j628, MINI-8qgm-ccmg-62m7, MINI-8r5g-88r4-xv55, MINI-8rqv-v37c-mpxx, MINI-8v9c-95v6-q4w8, MINI-8v9w-mxxj-xmc5, MINI-8w33-ffhp-qp29, MINI-8wgv-47r7-849w, MINI-8wj5-frfx-w9wj, MINI-8wxc-mcmh-568h, MINI-8wxr-g6m7-23xg, MINI-8x6h-346j-pq9r, MINI-8xm4-pw9j-xx69, MINI-8xx3-622h-h7mv, MINI-928c-qr6r-42f7, MINI-92gm-cgff-4f9v, MINI-9352-gw9g-g455, MINI-935h-hpfj-fmx7, MINI-9383-96cq-hw82, MINI-939j-mc62-8c4q, MINI-93m3-4hcm-7cj3, MINI-93r7-2m6q-g683, MINI-93rx-p268-77ph, MINI-9443-vrjc-h7cf, MINI-945m-g7v9-5cc4, MINI-94gq-f6vr-9m3f, MINI-9524-vx4h-92ff, MINI-9569-h3jw-5r7c, MINI-95q3-h8wj-wgw6, MINI-965r-5f54-x3c2, MINI-968r-fp6q-jvfx, MINI-96r8-wrwh-hxvr, MINI-96wr-5v8x-4mxg, MINI-9725-rc7f-jpv9, MINI-97j6-c87w-55ch, MINI-988w-ggh8-x77h, MINI-98p7-5hxc-xv85, MINI-99h8-2vp8-c5qm, MINI-9c27-rh9w-74vw, MINI-9c42-565v-xpj5, MINI-9c4x-rp73-28q4, MINI-9cw2-v33m-rw8q, MINI-9f5j-h3q4-xf5g, MINI-9fgh-4jhh-f967, MINI-9fp8-p2gg-w854, MINI-9fq3-8pfr-p4c9, MINI-9g88-858x-95jg, MINI-9hxc-qrf7-v524, MINI-9j75-78gm-c95p, MINI-9j7c-489h-77gf, MINI-9jfg-gw9q-jhwf, MINI-9jw3-v6xv-h328, MINI-9jx3-q7c9-6h65, MINI-9m27-jj77-f9w3, MINI-9m4p-fg84-f8vf, MINI-9m6w-qh9v-xwxr, MINI-9p5x-qp3p-2chm, MINI-9pcc-h8hw-jm6w, MINI-9pmh-c354-7gcq, MINI-9prm-2frh-r56v, MINI-9qgg-wx8p-j5f6, MINI-9qgh-w296-hrp7, MINI-9qm3-gc22-j295, MINI-9qr5-w3px-w3fg, MINI-9r9g-hcm6-6pf5, MINI-9v2m-9cw2-vv5q, MINI-9vm8-g577-mpmc, MINI-9w7f-mjqh-2223, MINI-9wf9-xff8-8fhw, MINI-9xr8-2vqr-f9gh, MINI-9xx7-89cm-45mp, MINI-c2wx-9r74-2rgc, MINI-c35m-q227-px3x, MINI-c35q-3j7c-x6p5, MINI-c3p4-c9vj-p6g7, MINI-c4hg-f4wc-rxwv, MINI-c562-7867-rp23, MINI-c586-v9qv-jp9v, MINI-c59r-hx62-985h, MINI-c5rv-5383-rm33, MINI-c657-49hp-r5v6, MINI-c65f-fg3p-hvvg, MINI-c668-98fc-7vvg, MINI-c689-r6f5-wchm, MINI-c6hx-rhqg-7mvq, MINI-c7rf-h7ff-gcqv, MINI-c89f-cv5v-3mvg, MINI-c8h6-c5vg-3r4v, MINI-c8v7-w4vp-99qq, MINI-c9g2-r6cv-rq42, MINI-c9mh-h966-q852, MINI-c9vf-m99h-mf7c, MINI-c9vv-mxj5-x4rp, MINI-c9xp-c37r-gjpj, MINI-cc62-f3gg-4xwh, MINI-cfrp-xmvc-wv5v, MINI-cg26-wxvg-whr9, MINI-cg3p-pmxx-w5fj, MINI-cg4v-jm5v-j2w9, MINI-cgpc-vcv8-5432, MINI-cgpp-gw6f-4gf5, MINI-cgvw-mmg4-x74g, MINI-ch4w-vc2x-4r8f, MINI-ch6m-93g6-jxmh, MINI-ch86-fffr-hp62, MINI-ch88-8ppp-427p, MINI-chr7-34xr-7x52, MINI-chv5-4fj9-7587, MINI-cjm7-v96q-8x6r, MINI-cjp4-4392-qc34, MINI-cm39-g22j-p42p, MINI-cm6c-g8p8-pc3x, MINI-cmhh-69xv-hwr2, MINI-cmj4-2w33-f8q3, MINI-cmvq-pvw7-72rh, MINI-cp3p-qprp-4qw3, MINI-cp7c-2r4w-6fqr, MINI-cp7g-fpx6-xv3x, MINI-cphh-3r5r-8478, MINI-cpqv-jgvj-pgc7, MINI-cqg7-g865-g789, MINI-cqg7-h2r3-mcx4, MINI-cqvr-4x9r-6p6x, MINI-crmg-f8qh-2q47, MINI-cvch-r8pm-mgpv, MINI-cvf6-fqc6-pc96, MINI-cwc6-93m3-3x9p, MINI-cwm8-rvg9-6336, MINI-cwxc-4h3c-x4q6, MINI-cxc2-jqgc-mv7g, MINI-cxx2-xh8q-529m, MINI-f3hf-2f3m-5f6j, MINI-f42p-g5rf-597f, MINI-f4jc-gh7x-p67r, MINI-f6hj-w66c-2328, MINI-f6m8-hrf6-j5m3, MINI-f6p8-q7fh-4h6f, MINI-f7mr-39wq-cpr7, MINI-f7r4-3m92-6r98, MINI-f85q-f57f-4qc5, MINI-f9qf-9g8g-pmm5, MINI-f9v8-x4pw-pwrf, MINI-fc42-vhjf-cq6c, MINI-fcm7-86q6-35w8, MINI-ffrm-rg5q-hqm3, MINI-ffxr-x9p4-p3wp, MINI-fg62-p289-mgvc, MINI-fg8h-x7c9-rmvp, MINI-fgp6-rxm8-pv96, MINI-fgxm-ggxq-8r85, MINI-fh63-7q28-hf42, MINI-fh7g-wvcf-wxrw, MINI-fh8x-v3hr-33qp, MINI-fhh4-m658-hf4c, MINI-fhmv-5c6p-w4x9, MINI-fjm4-mq7j-8rvp, MINI-fjqx-q22f-h98x, MINI-fm5j-vvp8-jfxg, MINI-fmv2-5m9m-pfrr, MINI-fmv9-f766-rxgm, MINI-frc7-rwj4-m89m, MINI-fvxq-62jx-hc29, MINI-fw78-93c2-m7g9, MINI-fx3g-jfc4-474x, MINI-g24x-wcjf-4qh9, MINI-g2g3-f2qx-x2pf, MINI-g2qm-9hrr-j8f7, MINI-g353-97m7-v9p2, MINI-g3j4-9cp7-6xrw, MINI-g44v-3g4m-wc5c, MINI-g4pm-3596-cpph, MINI-g4r3-8jxf-h47w, MINI-g5qp-5x36-m864, MINI-g5qp-982q-729v, MINI-g7jx-6529-p8p6, MINI-g7xg-4fjm-2jvv, MINI-g88q-hr6x-5c93, MINI-g944-3wq7-2qgf, MINI-g9cm-rmf5-xh9w, MINI-g9q5-vc63-j4wx, MINI-gccx-xq7p-x97g, MINI-gcpf-949j-fg9w, MINI-gf4h-xmjc-q75q, MINI-gfmw-7vm7-f2vc, MINI-gg5q-3jm9-m6xh, MINI-gg7c-jcfv-6xw2, MINI-gg7g-2ghm-mgfq, MINI-gggh-qhc6-h736, MINI-ggvp-jjmp-rcwg, MINI-ggwv-r8mw-9cpr, MINI-gj37-4jgr-gp66, MINI-gj55-xj67-4q7r, MINI-gjf4-vhc8-7rg6, MINI-gjq2-734v-9xgw, MINI-gjwc-2373-76j6, MINI-gm8c-prf3-5q92, MINI-gq2g-gq25-wx36, MINI-gqw4-j76g-r357, MINI-gvqp-4qmg-6h78, MINI-gvwp-vvqq-rpp8, MINI-gw34-7cj6-8945, MINI-gx4h-xc3q-5c5v, MINI-gx54-4g99-h6w7, MINI-gxc4-3x7j-fqp2, MINI-h255-2v46-524x, 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MINI-vfxx-9px2-c22q, MINI-vg2w-66xr-vfpq, MINI-vg3h-v9gv-4j88, MINI-vg5j-pm55-2hqp, MINI-vh33-g37c-5236, MINI-vh3m-jp8f-fxcj, MINI-vhhf-pwv7-8gxc, MINI-vjgg-8jrx-84rc, MINI-vjrv-8cqq-4368, MINI-vm7c-cv5q-pg2h, MINI-vm9r-r34w-92h2, MINI-vmg4-j374-mr7r, MINI-vp3r-fq7j-7rrm, MINI-vpq9-hm2m-65xv, MINI-vpqp-qgr9-3cx5, MINI-vq4c-rm44-9h6p, MINI-vr4c-955r-85mc, MINI-vr4f-f6q2-q6pp, MINI-vr95-g86f-h23m, MINI-vrv8-x5qr-v382, MINI-vrww-v3r4-5r3p, MINI-vvgc-x636-p6jq, MINI-vw28-p8p5-8jh5, MINI-vw8m-5p9w-7grg, MINI-vw9h-48vx-7p2q, MINI-vwqr-gf45-8whq, MINI-vx25-p8g5-8hxx, MINI-vx8g-237h-fr7h, MINI-vxc3-5648-7ccf, MINI-vxx3-9g87-vp95, MINI-w2m9-89pr-6r9c, MINI-w2wm-4mqp-v7q4, MINI-w3pr-83jg-prgr, MINI-w423-4cqq-6q9h, MINI-w5p8-hc73-mh4c, MINI-w67g-gcr3-5cv2, MINI-w6c4-3wq9-wprf, MINI-w6hm-2w36-3qq9, MINI-w6x7-937c-pm6c, MINI-w7gv-cmvf-f4h9, MINI-w88m-9w84-q4qh, MINI-w8gg-vgvw-jccj, MINI-w9cv-33rp-j6x4, MINI-wch6-4qmh-rv62, MINI-wf9f-xc3f-9wxj, MINI-wfvg-g83x-rmjp, MINI-wg92-gcx3-7q8p, MINI-wgpv-f2x6-fj3q, MINI-wgv3-r7h5-w893, MINI-wh3m-f459-hwf4, MINI-whg7-hr85-79q7, MINI-whvm-p7q3-m739, MINI-wj3w-2m2g-j7vq, MINI-wj75-r5f3-mg27, MINI-wj93-pw5f-6f86, MINI-wjfj-c76f-c93j, MINI-wjhp-6cqf-r96j, MINI-wjpm-rwf9-mg99, MINI-wmc9-3vrc-6vqf, MINI-wmpm-4c88-27r7, MINI-wp5q-x2xg-96gf, MINI-wpfr-xjqh-27hm, MINI-wph3-cc2j-gjvc, MINI-wpvw-w3h5-693g, MINI-wq23-fc6m-rg7g, MINI-wqf4-fr55-4qjj, MINI-wqfq-j3pj-33p6, MINI-wqwf-gxfm-qfvf, MINI-wqxf-rc3h-pgjr, MINI-wr22-4phv-hrm5, MINI-wv6p-j58x-pm5v, MINI-wvmv-8ww4-8gxq, MINI-wvp4-h3rw-qr9j, MINI-wvpv-pqxc-qqw4, MINI-wvqq-rrm2-q9vq, MINI-wwg2-32q5-mfvp, MINI-www5-48gw-3xh5, MINI-wwwc-f9mf-7jrf, MINI-wxpx-83r9-6hq9, MINI-x23j-jqh5-3462, MINI-x3pf-h24p-jh9g, MINI-x472-36fh-vvg4, MINI-x5j6-8ff7-rvvg, MINI-x5pq-594m-c53g, MINI-x5r8-7gmx-3mcp, MINI-x5vq-hvv7-pm74, MINI-x66c-9mm4-4wj5, MINI-x6c3-p7v8-m9hx, MINI-x6rw-4fg9-4r5r, MINI-x6w7-32wc-8cxf, MINI-x79m-x93x-54v9, MINI-x827-qqjw-98mg, MINI-x86g-cgq3-59jx, MINI-x86x-f23h-756f, MINI-x8f8-x32c-vqq9, MINI-x929-52j5-c3xq, MINI-x93r-vqcp-jjm5, MINI-x959-cv6p-322c, MINI-x9rc-mp4v-pchm, MINI-xcf2-r4rf-w7f4, MINI-xf39-48r2-mjxg, MINI-xf9x-65jm-rj5w, MINI-xfwx-h29j-2rm5, MINI-xg22-6q54-g8fq, MINI-xg3g-fh2m-x42j, MINI-xgpw-g79c-7gj6, MINI-xh2j-f22x-j34v, MINI-xh3j-ch99-97qc, MINI-xh77-wg8j-fvp6, MINI-xh8q-phwj-cfh2, MINI-xhr5-jpxj-7h83, MINI-xhwg-2gm6-4wcv, MINI-xjhc-hh8m-8vwm, MINI-xjq8-v769-6pjj, MINI-xm3p-686h-v3h8, MINI-xm7x-f4rj-w2cg, MINI-xp59-qxhx-qc9h, MINI-xp5m-ph89-w92c, MINI-xq5p-77gg-vxmv, MINI-xqhq-8qf3-8w58, MINI-xqxf-7rhx-xjwj, MINI-xv7p-p6hg-phjv, MINI-xvj5-pvmw-phh5, MINI-xwx8-4x8j-4252, MINI-xxv9-9v6h-7757, RHSA-2026:46394, RHSA-2026:53416, RLSA-2026:46394, UBUNTU-CVE-2026-27145 ## What is CVE-2026-27145? CVE-2026-27145 is a medium-severity denial of service vulnerability in Go standard library crypto/x509, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description (*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates. Weakness: CWE-606 (Unchecked Input for Loop Condition) ## Which versions are affected by CVE-2026-27145? 2 open source packages ship an affected version, including golang and stdlib. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `golang` | Bitnami | All versions | 1.25.11, 1.26.4 | | `stdlib` | Go | All versions | 1.25.11, 1.26.4 | | `go-fdo-client` | AlmaLinux:10 | All versions | 1.0.0-4.el10_2.5 | | `go-fdo-client` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.0.0-4.el10_2.5 | | `go-fdo-client-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.0.0-4.el10_2.5 | | `go-fdo-client-debugsource` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.0.0-4.el10_2.5 | | `host-metering` | Red Hat:rhel_els:7 | All versions | 0:1.4.0-8.el7_9 | | `host-metering-debuginfo` | Red Hat:rhel_els:7 | All versions | 0:1.4.0-8.el7_9 | | `host-metering-debugsource` | Red Hat:rhel_els:7 | All versions | 0:1.4.0-8.el7_9 | | `host-metering-selinux` | Red Hat:rhel_els:7 | All versions | 0:1.4.0-8.el7_9 | | `go-fdo-client` | Rocky Linux:10 | All versions | 0:1.0.0-4.el10_2.5 | ## How do I fix CVE-2026-27145? Upgrade golang to a fixed version for your release line: 1.25.11 or 1.26.4. ## Is CVE-2026-27145 being exploited? There is no known exploitation of CVE-2026-27145 in the wild and no public exploit code. Public exploit code: - CVE-2026-27145 - Draft (github_poc): https://github.com/HORKimhab/CVE-2026-27145 ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-27145 and fix it if it is affected. What it is: CVE-2026-27145 is a medium-severity denial of service vulnerability in Go standard library crypto/x509, published on 2 Jun 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-2026-27145 in the wild and no public exploit code. Affected packages and fixed versions: - golang (Bitnami): affected all versions; fixed in 1.25.11, 1.26.4 - stdlib (Go): affected all versions; fixed in 1.25.11, 1.26.4 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-2026-27145/ (Markdown: https://insights.sbomify.com/CVE-2026-27145/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27145 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27145 - OSV: https://osv.dev/vulnerability/CVE-2026-27145 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-27145/ Summaries are generated and may contain mistakes; the official description above is the record.