Bug 2448503 (CVE-2026-27459) - CVE-2026-27459 pyOpenSSL: DTLS cookie callback buffer overflow
Summary: CVE-2026-27459 pyOpenSSL: DTLS cookie callback buffer overflow
Keywords:
Status: NEW
Alias: CVE-2026-27459
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2448652 2448655
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-18 00:02 UTC by OSIDB Bzimport
Modified: 2026-03-18 16:49 UTC (History)
52 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-03-18 00:02:08 UTC 
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.
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