Excessive memory allocation in s2n-quic
CVE-2026-10740

6.9MEDIUM

Key Information:

Vendor

Aws

Status
S2n-quic
Vendor
CVE Published:
10 June 2026

What is CVE-2026-10740?

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.

Affected Version(s)

s2n-quic 0 <= 1.8.1

References

https://github.com/aws/s2n-quic/releases/tag/v1.82.0
patch
https://aws.amazon.com/security/security-bulletins/2026-0...
vendor-advisory
https://github.com/aws/s2n-quic/security/advisories/GHSA-...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.