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Medium, CVSS 4.4

webpki: CRLs not considered authoritative by Distribution Point due to faulty matching logic

GHSA-pwjx-qhcg-rvj4

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (rustls-webpki 0.104.0-alpha.5, 0.103.10), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • crates.io rustls-webpki

    Affected
    >= 0.104.0-alpha.1, < 0.104.0-alpha.5>= 0.102.0-alpha.0, < 0.103.10
    Fixed in
    0.104.0-alpha.5, 0.103.10

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.4 · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

If a certificate had more than one distributionPoint, then only the first distributionPoint would be considered against each CRL's IssuingDistributionPoint distributionPoint, and then the certificate's subsequent distributionPoints would be ignored. The impact was that correct provided CRLs would not be consulted to check revocation. With UnknownStatusPolicy::Deny (the default) this would lead to incorrect but safe Error::UnknownRevocationStatus. With UnknownStatusPolicy::Allow this would lead to inappropriate acceptance of revoked certificates. This vulnerability is thought to be of limited impact. This is because both the certificate and CRL are signed -- an attacker would need to compromise a trusted issuing authority to trigger this bug. An attacker with such capabilities could likely bypass revocation checking through other more impactful means (such as publishing a valid, empty CRL.) More likely, this bug would be latent in normal use, and an attacker could leverage faulty…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-pwjx-qhcg-rvj4

Agent brief

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# Patch Next advisory brief: GHSA-pwjx-qhcg-rvj4

Advisory: webpki: CRLs not considered authoritative by Distribution Point due to faulty matching logic
IDs: GHSA-pwjx-qhcg-rvj4
Record: https://patchnext.com/advisories/ghsa-pwjx-qhcg-rvj4 (revision 1, source checked 26 Oct 2026, 15:42 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: rustls-webpki 0.104.0-alpha.5, 0.103.10. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io rustls-webpki: affected >= 0.104.0-alpha.1, < 0.104.0-alpha.5; >= 0.102.0-alpha.0, < 0.103.10; fixed in 0.104.0-alpha.5, 0.103.10

## Suggested inspection (read-only)
- crates.io rustls-webpki: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on rustls-webpki.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-pwjx-qhcg-rvj4 (GitHub-reviewed advisory GHSA-pwjx-qhcg-rvj4 lists affected ranges: crates.io rustls-webpki >=0.104.0-alpha.1 =0.102.0-alpha.0 <0.103.10)

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