pyOpenSSL DTLS cookie callback buffer overflow
If a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Cookie values that are too long are now rejected.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-27459US | critical9.8 | — | ||
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` retu… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/pyca/pyopensslPACKAGE
- https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rstWEB
- https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408WEB
- https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-27459ADVISORY
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