GitHub Advisoryadvisory · crates.io

GHSA-6w86-wgwq-rgq8 neqo-qpack has iInteger overflow in qpack dynamic table indexing

MEDIUM Published 2026-03-04 Modified 2026-03-04 Official page ↗
Ecosystem
crates.io
Packages
neqo-qpack
Severity
Moderate
CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weaknesses
CWE-190
Reviewed
2026-03-04

Affected packages

• crates.io neqo-qpack: <= 0.22.2 (no fix yet)

Description

Summary An unsanitized qpack index can lead to an integer overflow, panicing in debug mode, accessing the wrong or no dynamic table entry in release mode. What does this mean for Firefox? Firefox runs Neqo in release mode. A malicious remote can cause its own QUIC connection to fail to use qpack, i.e. compression, or enter an inconsistent state. The remote can not crash Firefox, nor affect other QUIC connections. Details See fuzz report in https://github.com/mozilla/neqo/issues/3406. PoC See test in pull request. Impact All Firefox users. Though vulnerability likely scoped to same connection, i.e. low impact.

Related

Weakness · CWE (1)

  • CWE-190 Integer Overflow or Wraparound weakness

References