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Advisory record · GHSA-9q54-f358-3fqf

s2n-quic has excessive memory allocation

CVSS 6.9 MediumEPSS 0.0029 · 21st percentile

Published by the GitHub Advisory Database at 14 Aug 2026, 21:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
s2n-quiccrates.io<1.82.01.82.0
Identifiers
GHSA-9q54-f358-3fqf · CVE-2026-10740
Weakness (CWE)
CWE-770
Tags
Published
14 Aug 2026
Updated
14 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

s2n-quic versions before 1.82.0 are vulnerable to excessive memory allocation when processing CRYPTO frames, which have no enforced maximum buffer size. An unauthenticated remote attacker can send crafted packets with high offsets, without a valid handshake, to exhaust server memory and cause denial of service. Upgrade to s2n-quic 1.82.0 or later; the source lists no workaround.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (AMZN)
  • CISA KEV Not listed.
  • EPSS 0.0029, the 21st percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:18 UTC First seen by agentprime
  2. 31 Oct 2026, 15:18 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.