neqo-qpack has iInteger overflow in qpack dynamic table indexing
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- No fix listed
No CVSS vector from any source. Fix status from GitHub.
Summary
### 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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | neqo-qpack (crates.io) | up to 0.22.2 | — | No fix listed | GHSA-6w86-wgwq-rgq8 |
- neqo-qpack (crates.io) Vendor— Affected up to 0.22.2 Fixed in — No fix listed GHSA-6w86-wgwq-rgq8
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-03 Threatist record created from GHSA-6w86-wgwq-rgq8
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences