EUVD-2026-82897
GHSA-8hrm-p5h4-6vcx
Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Requires a compromised trusted issuing authority (PR:H) and a specific multi-distributionPoint/non-default-policy condition (AC:H); impact is accepting revoked certs, so I:H and C:N/A:N.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 contain faulty CRL authority-matching logic that compares only the first distributionPoint against each CRL's IssuingDistributionPoint, ignoring additional distributionPoints. Attackers with a compromised trusted issuing authority can present revoked certificates that pass revocation checks under UnknownStatusPolicy::Allow, or cause incorrect errors under the default deny policy.
AnalysisAI
CRL revocation-check bypass in rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 can cause revoked X.509 certificates to be accepted when a relying application uses the non-default UnknownStatusPolicy::Allow, because the CRL authority-matching logic compares only a certificate's first distributionPoint against each CRL's IssuingDistributionPoint and ignores any additional distributionPoints. Exploitation requires an attacker who has already compromised a trusted issuing CA (a high-privilege position, consistent with the CVSS PR:H vector) plus a target certificate that carries more than one CRL distributionPoint; the default UnknownStatusPolicy::Deny fails safe by returning Error::UnknownRevocationStatus instead of accepting the certificate. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires ALL of: (1) an attacker who has compromised a trusted issuing certificate authority, since both the certificate and CRL are signed; (2) a target certificate presenting more than one CRL distributionPoint, so that the faulty first-only matching skips the authoritative distributionPoint; and (3) the relying party running rustls-webpki before 0.103.10 or 0.104.0-alpha.5 with CRL revocation checking enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuinely low-priority issue despite a mid-range 5.9 CVSS 4.0 score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patches are available: upgrade rustls-webpki to 0.103.10 (for the 0.102.x/0.103.x line) or to 0.104.0-alpha.5 (for the 0.104.0 alpha line), as documented in GHSA-pwjx-qhcg-rvj4 (https://github.com/rustls/webpki/security/advisories/GHSA-pwjx-qhcg-rvj4) and corroborated by VulnCheck (https://www.vulncheck.com/advisories/rustls-webpki-before-0.103.10-crl-revocation-check-bypass). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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