Reachable panic in certificate revocation list parsing
A panic was reachable when parsing certificate revocation lists via [`BorrowedCertRevocationList::from_der`] or [`OwnedCertRevocationList::from_der`]. This was the result of mishandling a syntactically valid empty `BIT STRING` appearing in the `onlySomeReasons` element of a `IssuingDistributionPoint` CRL extension. This panic is reachable prior to a CRL's signature being verified. Applications that do not use CRLs are not affected. Thank you to [@tynus3](https://github.com/tynus3) for the report.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-93599US | — | — | ||
rustls-webpki through 0.103.12 (and 0.104.0-alpha releases before 0.104.0-alpha.7) contains a reachable panic in bit_string_flags() in src/der.rs. The input guard fails to reject a… | ||||
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