--- id: CVE-2026-111943 title: Distrust compromised intermediate certificates in crypto/x509 summary: >- On 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. To defend against the narrower set of cases that may remain affected, a de… 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' cvssSource: adp cwe: - CWE-299 - CWE-295 vendor: Go standard library product: crypto/x509 affected: - crypto/x509 < 1.26.10 - crypto/x509 >= 1.27.0-0 < 1.27.3 ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-10-30T13:08:09.750640Z' exploitAvailable: true published: '2026-10-21' updated: '2026-10-30' sourceUpdated: '2026-10-30T13:08:13.559Z' source: CVEORG sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111943' 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://pkg.go.dev/vuln/GO-2026-6809' - 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' tags: - cve.org - exploit-available - osv - go - rust - csaf - vex - red-hat epss: 0.00396 epssPercentile: 0.33949 exploits: github: 6 githubRepos: - 'https://github.com/phpc0de/CVE-2026-111943-Remediator' - 'https://github.com/majiayu000/trustsweep' - 'https://github.com/andersundsehr/ca-trust-audit' checkedAt: '2026-11-05T16:08:07.468Z' aliases: - GO-2026-6809 - BIT-golang-2026-111943 - RUSTSEC-2026-0381 - RUSTSEC-2026-0382 - RUSTSEC-2026-0383 ecosystem: go patched: - stdlib 1.27.3 ingestedAt: '2026-10-21T01:37:07.998Z' --- ## Overview On 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. To 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. ## Affected - `crypto/x509 < 1.26.10` - `crypto/x509 >= 1.27.0-0 < 1.27.3` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Package advisory (CVE-2026-111943) Affected packages: - `stdlib >= 1.27.0-0, < 1.27.3` Patched in: - `stdlib 1.27.3` Source: https://osv.dev/vulnerability/GO-2026-6809 ## Vendor advisories - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **RHSA-2026:85899** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85899) - **RHSA-2026:86029** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86029)