--- id: CVE-2026-42508 title: >- Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation summary: >- Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked. severity: critical cvss: 9.1 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N' cwe: - CWE-295 vendor: golang product: crypto affected: - crypto < 0.52.0 patched: - crypto 0.52.0 published: '2026-05-22' updated: '2026-09-15' sourceUpdated: '2026-09-15T12:17:45.777' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42508' references: - url: 'https://go.dev/cl/781220' label: security@golang.org - url: 'https://go.dev/issue/79568' label: security@golang.org - url: 'https://groups.google.com/g/golang-announce/c/a082jnz-LvI' label: security@golang.org - url: 'https://pkg.go.dev/vuln/GO-2026-5021' label: security@golang.org - url: 'https://access.redhat.com/errata/RHSA-2026:23262' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:23264' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:26546' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:26547' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:35833' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36648' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36651' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36796' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36797' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36808' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:37072' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:37123' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:37387' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:40118' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:40262' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:40945' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:41019' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:41031' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:41036' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:41064' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:41066' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:42146' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:42796' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:43052' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:43692' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:46885' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:47735' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:47737' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:49944' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:51033' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:51288' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:52857' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:52910' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:54400' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:57194' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:59467' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:60520' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:61314' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:65126' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:66022' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:66521' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:67450' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-42508' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2480688' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42508.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-42508' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42508' - url: 'https://github.com/advisories/GHSA-5cgq-3rg8-m6cv' - url: 'https://access.redhat.com/errata/RHSA-2026:70870' tags: - nvd - cve.org - csaf - vex - red-hat - ghsa - go - osv ssvc: exploitation: none automatable: 'yes' technicalImpact: total timestamp: '2026-05-22T18:43:40.584666Z' epss: 0.00654 epssPercentile: 0.49175 ecosystem: go scores: nvd: 9.1 adp: 9.1 vendor: 7.4 ingestedAt: '2026-06-26T16:43:14.192Z' aliases: - GO-2026-5021 - GHSA-5cgq-3rg8-m6cv --- ## Overview Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked. ## Affected - `crypto < 0.52.0` ## Remediation Upgrade past the affected range: - `crypto 0.52.0` ## Package advisory (CVE-2026-42508) Affected packages: - `golang.org/x/crypto/ssh/knownhosts < 0.52.0` Patched in: - `golang.org/x/crypto/ssh/knownhosts 0.52.0` Source: https://github.com/advisories/GHSA-5cgq-3rg8-m6cv ## Vendor advisories - **RHSA-2026:41019** · Red Hat · fixed in: RHEM 1.1 for RHEL 10, RHEM 1.1 for RHEL 9 · released 2026-07-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:41019) - **RHSA-2026:36796** · Red Hat · fixed in: RHEM 1.0 for RHEL 9 · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36796) - **RHSA-2026:37072** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:37072) - **RHSA-2026:35833** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-07-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:35833) - **RHSA-2026:51288** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51288) - **RHSA-2026:49944** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-08-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:49944) - **RHSA-2026:37123** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:37123) - **RHSA-2026:61314** · Red Hat · fixed in: Cluster Observability Operator 1.5.0 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61314) - **RHSA-2026:36808** · Red Hat · fixed in: DevWorkspace Operator 0.42 · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36808) - **RHSA-2026:66521** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.6 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66521) - **RHSA-2026:51033** · Red Hat · fixed in: OpenShift API for Data Protection 1.3 · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51033) - **Red Hat VEX** · Important · affected: cert-manager Operator for Red Hat OpenShift, External Secrets Operator for Red Hat OpenShift, OpenShift Pipelines, OpenShift Serverless, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, … · no fix planned: External Secrets Operator for Red Hat OpenShift, Red Hat OpenShift Container Platform 4, cert-manager Operator for Red Hat OpenShift, OpenShift Pipelines, … · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42508.json) - **RHSA-2026:59467** · Red Hat · fixed in: OpenShift API for Data Protection 1.4 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59467) - **RHSA-2026:67450** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67450) - **RHSA-2026:70870** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.5 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70870)