PatchRadar

← Browse

CVE-2026-27459

Medium

Elevated severity or exploit probability.

CVSS base
9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
0.7%
51.9th percentile
CISA KEV
Not listed
Weakness / dates
CWE-120
Published 2026-03-18 · modified 2026-09-10

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.

Affected

pyopenssl

References

Official: NVD · CVE.org