{"id":"GHSA-9q54-f358-3fqf","summary":"s2n-quic has excessive memory allocation","details":"s2n-quic is a Rust implementation of the QUIC protocol. An unauthenticated user can attempt to exhaust server memory on an s2n-quic endpoint by sending crafted CRYPTO frames with high offsets. The buffer used for processing CRYPTO frames does not enforce a maximum size. In the worst case, a single 1200-byte packet can cause approximately 9.4 MB of allocation. By repeatedly sending such packets, the resulting memory pressure could cause denial of service. No valid handshake is required.\n\nImpacted versions: \u003c= v1.81.0\n\n### Patches\nThis issue has been addressed in s2n-quic version v1.82.0. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. \n\n### Workarounds\nThere is no workaround that fully mitigates this issue. Upgrading to the patched version is the recommended remediation.\n\n### References\nIf there are any questions or comments about this advisory, contact AWS Security via the [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.","aliases":["CVE-2026-10740"],"modified":"2026-08-14T22:00:07.674402828Z","published":"2026-08-14T21:44:19Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-08-14T21:44:19Z","nvd_published_at":"2026-06-10T19:16:32Z","cwe_ids":["CWE-770"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/aws/s2n-quic/security/advisories/GHSA-9q54-f358-3fqf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-10740"},{"type":"WEB","url":"https://aws.amazon.com/security/security-bulletins/2026-042-aws"},{"type":"PACKAGE","url":"https://github.com/aws/s2n-quic"},{"type":"WEB","url":"https://github.com/aws/s2n-quic/releases/tag/v1.82.0"}],"affected":[{"package":{"name":"s2n-quic","ecosystem":"crates.io","purl":"pkg:cargo/s2n-quic"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.82.0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 1.81.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-9q54-f358-3fqf/GHSA-9q54-f358-3fqf.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V4","score":"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"}]}