DEBIAN-CVE-2026-93599

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Source

https://security-tracker.debian.org/tracker/CVE-2026-93599

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93599.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-93599

Upstream

CVE-2026-93599

Published

2026-09-18T14:19:11Z

Modified

2026-09-19T05:00:32Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 CVSS Calculator

Summary

[none]

Details

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 named-bit BIT STRING whose content is exactly [0x00] (zero padding bits and no data bytes), so raw_bits.len() - 1 underflows on the empty slice and the subsequent index operation panics (subtract-with-overflow in debug, index-out-of-bounds in release). The condition is reachable through the public API BorrowedCertRevocationList::from_der() when a CRL contains an issuingDistributionPoint extension with such an onlySomeReasons value. Exploitation requires an application that explicitly opts in to CRL revocation checking by passing RevocationOptions to verify_for_usage() and that parses CRL bytes obtained from a source the attacker can influence; the default rustls configuration, which does not use RevocationOptions, is unaffected. A crafted CRL causes a denial of service via the panic. Fixed in 0.103.13 and 0.104.0-alpha.7.

References

https://security-tracker.debian.org/tracker/CVE-2026-93599

Affected packages

Debian:13 / rust-rustls-webpki

Package

Name: rust-rustls-webpki
Purl: pkg:deb/debian/rust-rustls-webpki?arch=source&distro=trixie

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.102.8-5

0.103.4-1

0.103.4-2

0.103.5-1

0.103.6-1

0.103.7-1

0.103.9+ds-1

0.103.9+ds-2

0.103.10+ds-1

0.103.13+ds-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93599.json"

Debian:14 / rust-rustls-webpki