{"id":"GHSA-rp9h-rf7g-hwgr","revision":null,"records":[{"revision":"bf4cd7a6eca1453ba8caf53e6ccf9858","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-rp9h-rf7g-hwgr","aliases":[],"title":"s2n-tls has undefined behavior at process exit","description":"### Impact\ns2n-tls uses the Linux atexit function to register functions that clean up the global state when the process exits. In multi-threaded environments, the atexit handler may clean up state which is still in use by other threads. When this occurs, the exiting process may experience a segmentation fault or other undefined behavior. \n\nCustomers of AWS services do not need to take action. Applications using s2n-tls should upgrade to the most recent release of s2n-tls.\n\n**Impacted versions**: < v1.5.9.\n\n### Patches\nThe patch commit [493b771](https://github.com/aws/s2n-tls/commit/493b77167dc367c394de23cfe78a029298e2a254) is included in s2n-tls v1.5.9 [1]\n\n### Workarounds\nThe atexit handler may be disabled by calling `s2n_disable_atexit()` prior to initializing s2n-tls. The atexit handler is off by default in the patched versions. For further details, refer to [s2n-tls Usage Guide: Initialization and Teardown](https://github.com/aws/s2n-tls/blob/main/docs/usage-guide/topics/ch02-initialization.md).\n\nIf you have any questions or comments about this advisory, we ask that you contact AWS/Amazon Security via our vulnerability reporting page [2] or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.\n\n[1] https://github.com/aws/s2n-tls/releases/tag/v1.5.9\n[2] Vulnerability reporting page: https://aws.amazon.com/security/vulnerability-reporting\n","state":0,"publishedAt":"2024-11-14T15:45:55+00:00","modifiedAt":"2026-09-10T03:50:56.0396542+00:00","affected":[{"ecosystem":"crates.io","name":"s2n-tls","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.3.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/aws/s2n-tls/security/advisories/GHSA-rp9h-rf7g-hwgr","https://github.com/aws/s2n-tls/commit/493b77167dc367c394de23cfe78a029298e2a254","https://github.com/aws/s2n-tls","https://github.com/aws/s2n-tls/releases/tag/v1.5.9"],"sourceUrl":"https://github.com/advisories/GHSA-rp9h-rf7g-hwgr","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-rp9h-rf7g-hwgr","identifiers":["GHSA-rp9h-rf7g-hwgr"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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