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Description

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` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.

PUBLISHED Reserved 2026-02-19 | Published 2026-03-17 | Updated 2026-03-18 | Assigner GitHub_M




HIGH: 7.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U

Problem types

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Product status

>= 22.0.0, < 26.0.0
affected

References

github.com/...penssl/security/advisories/GHSA-5pwr-322w-8jr4

github.com/...ommit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408

github.com/...c4e364c59930e53a270116249581eaa3/CHANGELOG.rst

cve.org (CVE-2026-27459)

nvd.nist.gov (CVE-2026-27459)

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