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.
Scores
CVSS v3
9.8
EPSS
0.0003
EPSS Percentile
7.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-120
Status
published
Products (3)
pyca/pyopenssl
>= 22.0.0, < 26.0.0
pyopenssl/pyopenssl
22.0.0 - 26.0.0
pypi/pyopenssl
22.0.0 - 26.0.0PyPI
Published
Mar 18, 2026
Tracked Since
Mar 18, 2026