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.

zetlyn/cve-nvd vulnerability cve CVE-2026-27459 cpe cpe:2.3:a:pyopenssl:pyopenssl:*:*:*:*:*:*:*:* known 2026-03-18

https://nvd.nist.gov/vuln/detail/CVE-2026-27459

Properties

cvss9.8
receipt
Source
NVD
Its words
9.8
Read by
field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since
2026-09-29 09:45 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
What the source handed over
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        "lang": "en",
        "value": "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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}
productpyopenssl
receipt
Source
NVD
Its words
pyopenssl
Read by
field:cve.affected[].affectedData[].product
Said since
2026-09-29 17:49 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
2026-09-29 17:49 UTCpyopenssl
2026-09-29 09:45 UTC—
What the source handed over
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}
statusModified
receipt
Source
NVD
Its words
Modified
Read by
field:cve.vulnStatus
Said since
2026-09-29 09:45 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
What the source handed over
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}
vendorpyca
receipt
Source
NVD
Its words
pyca
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-09-29 17:49 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
2026-09-29 17:49 UTCpyca
2026-09-29 09:45 UTC—
What the source handed over
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}

Text

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. pyOpenSSL es un envoltorio de Python para la biblioteca OpenSSL. A partir de la versión 22.0.0 y antes de la versión 26.0.0, si una devolución de llamada proporcionada por el usuario a set_cookie_generate_callback devolvía un valor de cookie superior a 256 bytes, pyOpenSSL desbordaría un búfer proporcionado por OpenSSL. A partir de la versión 26.0.0, los valores de cookie que son demasiado largos ahora son rechazados.