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CVE-2026-27459 is a buffer overflow in pyOpenSSL DTLS cookie generation callback handling. pyOpenSSL versions 22.0.0 through versions before 26.0.0 copy the value returned by an application-defined set_cookie_generate_callback into an OpenSSL-provided cookie buffer without rejecting values exceeding the DTLS cookie length limit of 256 bytes. An oversized callback return value can overrun that buffer. pyOpenSSL 26.0.0 rejects oversized cookie values and raises an error.
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No public exploit code observed for this vulnerability.
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15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A named vulnerability affecting pyOpenSSL packages on ZTE CGSL Main 7. The plugin assigns a CVSS v3.0 base vector of AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; however, the content does not describe the underlying flaw.
A DTLS cookie callback buffer overflow vulnerability.
A buffer overflow vulnerability in pyOpenSSL involving the DTLS cookie callback.
A buffer overflow vulnerability in pyOpenSSL involving the DTLS cookie callback.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.