CVE-2026-27459

CRITICAL

9.8

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.

Details CVE

Score CVSS v3.19.8

SeveriteCRITICAL

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie3/18/2026

Derniere modification3/25/2026

Sourcenvd

Observations honeypot0

Produits affectes

pyopenssl:pyopenssl

Faiblesses (CWE)

CWE-120

References

https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst(security-advisories@github.com)

https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408(security-advisories@github.com)

https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4(security-advisories@github.com)

Correlations IOC

Aucune correlation enregistree

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