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Vulnerabilities / CVE-2026-27459

critical

CVE-2026-27459

pyOpenSSL: DTLS cookie callback buffer overflow

Published Modified CWE 120
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GHSA7.2CVSS: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
Red Hat8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD, Photon OS. Rated lower by GHSA (high), Red Hat (high), Azure Linux (high), Ubuntu (medium).

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.

Affected packages and fixed versions

SourcePackageFixed in
Photon OS 4.0python3-pyOpenSSL23.2.0-3.ph4
Photon OS 5.0python3-pyOpenSSL23.3.0-2.2.ph5
alpine 3.23py3-openssl26.1.0-r0
alpine 3.24py3-openssl26.1.0-r0
alpine edgepy3-openssl26.1.0-r0
Azure Linux 3.0pyOpenSSL0:24.2.1-2.azl3
chainguardairflow-2, airflow-3, authentik and 30 more2.11.2-r2 and 28 more
debian 12pyopensslno fix listed
debian 13pyopenssl25.0.0-1+deb13u1
debian 14pyopenssl26.0.0-1
echopyopenssl25.0.0-1+e2
echo pip::Echo OSVpyopenssl25.1.0+echo.1, 26.0.0
Show all 96 entries from 22 sources
SourcePackageFixed in
Photon OS 4.0python3-pyOpenSSL23.2.0-3.ph4
Photon OS 5.0python3-pyOpenSSL23.3.0-2.2.ph5
alpine 3.23py3-openssl26.1.0-r0
alpine 3.24py3-openssl26.1.0-r0
alpine edgepy3-openssl26.1.0-r0
Azure Linux 3.0pyOpenSSL0:24.2.1-2.azl3
chainguardairflow-22.11.2-r2
chainguardairflow-33.1.8-r8
chainguardauthentik2026.2.1-r4
chainguardauthentik-fips2026.2.1-r3
chainguardawx24.6.1-r31
chainguardaz2.84.0-r3
chainguarddatadog-agent-7.737.73.3-r23
chainguarddatadog-agent-7.747.74.1-r24
chainguarddatadog-agent-7.767.76.3-r41
chainguarddatadog-agent-7.777.77.3-r5
chainguarddatadog-agent-fips-7.717.71.2-r20
chainguarddatadog-agent-fips-7.737.73.3-r26
chainguarddatadog-agent-fips-7.747.74.1-r26
chainguarddatadog-agent-fips-7.767.76.3-r32
chainguarddatadog-agent-fips-7.777.77.3-r5
chainguarddatahub-ingestion1.5.0.1-r0
chainguarddbt-snowflake1.12.1-r0
chainguardggshield1.51.0-r1
chainguardgitlab-cng-18.718.7.5-r1
chainguardgitlab-cng-18.818.8.5-r2
chainguardgitlab-cng-18.918.9.2-r1
chainguardgitlab-cng-fips-18.718.7.5-r1
chainguardgitlab-cng-fips-18.818.8.5-r1
chainguardgitlab-cng-fips-18.918.9.2-r1
chainguardgitlab-cng-fips-19.019.0.2-r1
chainguardkeep0.51.0-r0
chainguardkeep-fips0.51.0-r0
chainguardlocalstack4.14.0-r4
chainguardmitmproxy12.2.3-r0
chainguardpy3-cassandra-medusa0.27.0-r5
chainguardrequest-12760.27.0-r6
chainguardsuperset-5.05.0.0-r20
chainguardsuperset-6.06.0.0-r4
debian 12pyopensslno fix listed
debian 13pyopenssl25.0.0-1+deb13u1
debian 14pyopenssl26.0.0-1
echopyopenssl25.0.0-1+e2
echo pip::Echo OSVpyopenssl25.1.0+echo.1, 26.0.0
minimosairflow-22.11.2-r0
minimosairflow-33.2.0-r0
minimosdatadog-agent-77.78.0-r0
minimosdatadog-agent-fips-77.78.0-r0
minimospy3-pyopenssl26.0.0-r0
pip::GitHub Security Advisory pippyopenssl26.0.0
rapidfort debian 12pyopenssl0:25.0.0-1+deb13u1, 0:26.0.0-1
rapidfort debian 13pyopenssl0:25.0.0-1+deb13u1, 0:26.0.0-1
rapidfort fedora 43kryoptic1.5.0-2.fc43
rapidfort fedora 43kryoptic-tools1.5.0-2.fc43
rapidfort fedora 43pyOpenSSL0:26.0.0-1.fc43
rapidfort fedora 43pyOpenSSL-doc26.0.0-1.fc43
rapidfort fedora 43python-cryptography0:46.0.5-1.fc43
rapidfort fedora 43python3-cryptography0:46.0.5-1.fc43
rapidfort fedora 43python3-pyOpenSSL0:26.0.0-1.fc43
rapidfort fedora 43rust-asn10.22.0-1.fc43
rapidfort fedora 43rust-asn1+default-devel0.22.0-1.fc43
rapidfort fedora 43rust-asn1+std-devel0.22.0-1.fc43
rapidfort fedora 43rust-asn1-devel0.22.0-1.fc43
rapidfort fedora 43rust-asn1_derive0.22.0-1.fc43
rapidfort fedora 43rust-asn1_derive+default-devel0.22.0-1.fc43
rapidfort fedora 43rust-asn1_derive-devel0.22.0-1.fc43
rapidfort fedora 43rust-cryptoki0.12.0-2.fc43
rapidfort fedora 43rust-cryptoki+default-devel0.12.0-2.fc43
rapidfort fedora 43rust-cryptoki+generate-bindings-devel0.12.0-2.fc43
rapidfort fedora 43rust-cryptoki+serde-devel0.12.0-2.fc43
rapidfort fedora 43rust-cryptoki-devel0.12.0-2.fc43
rapidfort fedora 43rust-cryptoki-sys0.5.0-2.fc43
rapidfort fedora 43rust-cryptoki-sys+bindgen-devel0.5.0-2.fc43
rapidfort fedora 43rust-cryptoki-sys+default-devel0.5.0-2.fc43
rapidfort fedora 43rust-cryptoki-sys+generate-bindings-devel0.5.0-2.fc43
rapidfort fedora 43rust-cryptoki-sys-devel0.5.0-2.fc43
rapidfort Oracle Linux 10pyOpenSSL26.2.0-2.el10_3
rapidfort Oracle Linux 10pyOpenSSL-doc26.2.0-2.el10_3
rapidfort Oracle Linux 10python3-pyOpenSSL26.2.0-2.el10_3
Red Hatpython-pyOpenSSLno fix listed
Red Hatpython3-pyOpenSSLno fix listed
Red Hatrhceph/rhceph-7-rhel9no fix listed
Red Hatrhceph/rhceph-8-rhel9no fix listed
Red Hatrhceph/rhceph-9-rhel9no fix listed
ubuntu 24.04pyopenssl23.2.0-1ubuntu0.1
ubuntu 25.10pyopenssl25.0.0-1ubuntu0.1
wolfiairflow-33.1.8-r8
wolfiaz2.84.0-r3
wolfidatadog-agent-7.737.73.3-r23
wolfidatadog-agent-7.747.74.1-r24
wolfidatadog-agent-7.767.76.3-r41
wolfidatadog-agent-7.777.77.3-r5
wolfiggshield1.51.0-r1
wolfimitmproxy12.2.3-r0
wolfipy3-cassandra-medusa0.27.0-r5
wolfisuperset-6.06.0.0-r4

References

All 31 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.