{"id":"CVE-2026-111943","aliases":["GO-2026-6809","BIT-golang-2026-111943","RUSTSEC-2026-0381","RUSTSEC-2026-0382","RUSTSEC-2026-0383"],"title":"Distrust compromised intermediate certificates in crypto/x509","summary":"Distrust compromised intermediate certificates in crypto/x509","severity":"medium","cvss":6.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","vendor":"stdlib","product":"stdlib","ecosystem":"go","affected":["stdlib >= 1.27.0-0, < 1.27.3"],"patched":["stdlib 1.27.3"],"published":"2026-10-21","updated":"2026-10-29","sourceUpdated":"2026-10-29T10:55:54.096394276Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GO-2026-6809","references":[{"url":"https://go.dev/cl/851047"},{"url":"https://go.dev/issue/82345"},{"url":"https://groups.google.com/g/golang-announce/c/66pojueaQek"},{"url":"https://crates.io/crates/webpki-roots"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0381.html"},{"url":"https://github.com/rustls/webpki-roots/pull/133"},{"url":"https://emudhra.we-have-a-problem.com/"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2083449"},{"url":"https://crates.io/crates/rustls-webpki"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0382.html"},{"url":"https://github.com/rustls/webpki/pull/546"},{"url":"https://crates.io/crates/webpki-root-certs"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0383.html"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-111943.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-111943"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2556068"},{"url":"https://access.redhat.com/security/vulnerabilities/RHSB-2026-012"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-111943"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111943"},{"url":"https://github.com/golang/go/issues/82345"},{"url":"https://groups.google.com/g/golang-nuts/c/K22sG2AYnKU"},{"url":"https://access.redhat.com/errata/RHSA-2026:89884"},{"url":"https://access.redhat.com/errata/RHSA-2026:87040"},{"url":"https://access.redhat.com/errata/RHSA-2026:88397"},{"url":"https://access.redhat.com/errata/RHSA-2026:88317"},{"url":"https://access.redhat.com/errata/RHSA-2026:89892"},{"url":"https://access.redhat.com/errata/RHSA-2026:88262"},{"url":"https://access.redhat.com/errata/RHSA-2026:86093"},{"url":"https://access.redhat.com/errata/RHSA-2026:89751"},{"url":"https://access.redhat.com/errata/RHSA-2026:88316"},{"url":"https://access.redhat.com/errata/RHSA-2026:88280"},{"url":"https://access.redhat.com/errata/RHSA-2026:89752"},{"url":"https://access.redhat.com/errata/RHSA-2026:88336"},{"url":"https://access.redhat.com/errata/RHSA-2026:89832"},{"url":"https://access.redhat.com/errata/RHSA-2026:89761"},{"url":"https://access.redhat.com/errata/RHSA-2026:89760"},{"url":"https://access.redhat.com/errata/RHSA-2026:86203"},{"url":"https://access.redhat.com/errata/RHSA-2026:88188"},{"url":"https://access.redhat.com/errata/RHSA-2026:88189"},{"url":"https://access.redhat.com/errata/RHSA-2026:89741"},{"url":"https://access.redhat.com/errata/RHSA-2026:87246"},{"url":"https://access.redhat.com/errata/RHSA-2026:88339"},{"url":"https://access.redhat.com/errata/RHSA-2026:88394"},{"url":"https://access.redhat.com/errata/RHSA-2026:87245"},{"url":"https://access.redhat.com/errata/RHSA-2026:88340"},{"url":"https://access.redhat.com/errata/RHSA-2026:88395"},{"url":"https://access.redhat.com/errata/RHSA-2026:87041"},{"url":"https://access.redhat.com/errata/RHSA-2026:87732"},{"url":"https://access.redhat.com/errata/RHSA-2026:86973"},{"url":"https://access.redhat.com/errata/RHSA-2026:87042"},{"url":"https://access.redhat.com/errata/RHSA-2026:88332"},{"url":"https://access.redhat.com/errata/RHSA-2026:86196"},{"url":"https://access.redhat.com/errata/RHSA-2026:85899"},{"url":"https://access.redhat.com/errata/RHSA-2026:86029"},{"url":"https://pkg.go.dev/vuln/GO-2026-6809"}],"tags":["osv","go","rust","exploit-available","csaf","vex","red-hat","cve.org"],"epss":0.00299,"epssPercentile":0.2256,"exploits":{"github":5,"githubRepos":["https://github.com/phpc0de/CVE-2026-111943-Remediator","https://github.com/andersundsehr/ca-trust-audit","https://github.com/majiayu000/trustsweep"],"checkedAt":"2026-10-29T19:04:57.396Z"},"exploitAvailable":true,"cvssSource":"vendor","cwe":["CWE-295","CWE-299"],"ingestedAt":"2026-10-21T01:37:07.998Z","slug":"CVE-2026-111943","body":"## Overview\n\nOn most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action.\n\nTo defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy.\n\n## Affected packages\n\n- `stdlib >= 1.27.0-0, < 1.27.3`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `stdlib 1.27.3`\n\n## Vendor advisories\n\n- **RHSA-2026:89884** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:89884)\n- **RHSA-2026:87040** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87040)\n- **RHSA-2026:88397** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88397)\n- **RHSA-2026:88317** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88317)\n- **RHSA-2026:89892** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:89892)\n- **RHSA-2026:88262** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88262)\n- **RHSA-2026:86093** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86093)\n- **RHSA-2026:89751** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:89751)\n- **RHSA-2026:88316** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88316)\n- **RHSA-2026:88280** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88280)\n- **RHSA-2026:89752** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:89752)\n- **Red Hat VEX** · Important · affected: Ansible Automation Orchestrator 2026, OpenShift Developer Tools and Services, OpenShift Pipelines, OpenShift Serverless, OpenShift Service Mesh 3, Red Hat Ansible Automation Platform 2, … · no fix planned: Red Hat Hardened Images, Ansible Automation Orchestrator 2026, OpenShift Developer Tools and Services, OpenShift Pipelines, … · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-111943.json)\n- **RHSA-2026:88336** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88336)\n- **RHSA-2026:86203** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86203)\n- **RHSA-2026:88188** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88188)\n- **RHSA-2026:88189** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88189)\n- **RHSA-2026:86196** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86196)\n- **RHSA-2026:85899** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85899)\n- **RHSA-2026:86029** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86029)","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":37.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":227639,"id":"CVE-2026-111943","ts":1792685273467,"field":"exploit_available","old":"false","new":"true"},{"seq":227013,"id":"CVE-2026-111943","ts":1792584995059,"field":"cvss","old":null,"new":"6.8"},{"seq":227012,"id":"CVE-2026-111943","ts":1792584995059,"field":"severity","old":"none","new":"medium"}]}