Vulnerabilities CVE-2026-27459

CVE-2026-27459

High

Open

TLP:CLEAR

pyOpenSSL DTLS cookie callback buffer overflow

NVD CVE.org

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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.

Details

CVSS Score: 7.2
EPSS Score ⓘ: 0.70%

50.1th percentile
CVSS Vector: CVSS: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
Confidence: 90%
Published: Mar 17, 2026
Last Modified: Aug 12, 2026

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