CVE-2026-10740

Excessive memory allocation in s2n-quic

State: Published
Severity: 6.9 Medium
Published: Jun 10, 2026
Updated: Jun 10, 2026
Reserved: Jun 3, 2026

Description

Unbounded memory allocation in the CRYPTO frame reassembler in s2n-quic before 1.8.2 may allow an unauthenticated remote actor to cause a denial of service (degraded availability) by sending crafted QUIC Initial packets.

To remediate this issue, users should upgrade to v1.8.2.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	AMZN
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	AMZN

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
s2n-quicAWS	1.8.1 and earlierAffected

References

https://github.com/aws/s2n-quic/releases/tag/v1.82.0patch
https://aws.amazon.com/security/security-bulletins/2026-042-aws/vendor-advisory
https://github.com/aws/s2n-quic/security/advisories/GHSA-9q54-f358-3fqfthird-party-advisory

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