CVE-2026-27459
pyOpenSSL DTLS cookie callback buffer overflow
CVE-2026-27459 is fixed in 51 products on 1 platform, first by DEBIAN-CVE-2026-27459, released March 18, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
9.8
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0075
55th percentile
large cookie value can lead to a buffer overflow (bsc#1259808).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| kryoptic · Fedora 43 | 1.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| kryoptic-debuginfo · Fedora 43 | 1.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| kryoptic-debugsource · Fedora 43 | 1.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| kryoptic-tools · Fedora 43 | 1.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| kryoptic-tools-debuginfo · Fedora 43 | 1.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| pyOpenSSL · Fedora 43 | 26.0.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| pyOpenSSL-doc · Fedora 43 | 26.0.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| pyopenssl · Debian 13.5 (trixie) | 25.0.0-1+deb13u1 | DEBIAN-CVE-2026-27459 | Mar 18, 2026 |
| pyopenssl · Debian 14 | 26.0.0-1 | DEBIAN-CVE-2026-27459 | Mar 18, 2026 |
| python-cryptography · Fedora 43 | 46.0.5-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| python-cryptography-debugsource · Fedora 43 | 46.0.5-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| python-pyOpenSSL · opensuse-leap 15.6 | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 | Apr 7, 2026 |
| python-pyOpenSSL · opensuse-leap 16.0 | 25.0.0-160000.3.1 | OPENSUSE-SU-2026:20419-1 | Mar 25, 2026 |
| python-pyOpenSSL · sles 15.6 | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 | Apr 7, 2026 |
| python-pyOpenSSL · sles 15.7 | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 | Apr 7, 2026 |
| python-pyOpenSSL · sles 16.0 | 25.0.0-160000.3.1 | SUSE-SU-2026:20930-1 | Mar 25, 2026 |
| python3-cryptography · Fedora 43 | 46.0.5-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| python3-cryptography-debuginfo · Fedora 43 | 46.0.5-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| python3-openssl · Ubuntu 24.04.5 LTS (noble) | 23.2.0-1ubuntu0.1 | python3-openssl 23.2.0-1ubuntu0.1 | Apr 15, 2026 |
| python3-openssl · Ubuntu 25.10 (questing) | 25.0.0-1ubuntu0.1 | python3-openssl 25.0.0-1ubuntu0.1 | Apr 15, 2026 |
| python3-pyOpenSSL · Fedora 43 | 26.0.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-asn1 · Fedora 43 | 0.22.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-asn1+default-devel · Fedora 43 | 0.22.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-asn1+std-devel · Fedora 43 | 0.22.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-asn1-devel · Fedora 43 | 0.22.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-asn1_derive · Fedora 43 | 0.22.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-asn1_derive+default-devel · Fedora 43 | 0.22.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-asn1_derive-devel · Fedora 43 | 0.22.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki · Fedora 43 | 0.12.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki+default-devel · Fedora 43 | 0.12.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki+generate-bindings-devel · Fedora 43 | 0.12.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki+serde-devel · Fedora 43 | 0.12.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki-devel · Fedora 43 | 0.12.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki-sys · Fedora 43 | 0.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki-sys+bindgen-devel · Fedora 43 | 0.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki-sys+default-devel · Fedora 43 | 0.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki-sys+generate-bindings-devel · Fedora 43 | 0.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-cryptoki-sys-devel · Fedora 43 | 0.5.0-2.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+aead-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+cipher-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+default-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+dsa-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+ec-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+ecdh-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+ecdsa-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+eddsa-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+fpe-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+hkdf-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+keywrap-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+mac-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+num-bigint-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+primality-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+rsa_enc-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+rsa_sig-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof+xdh-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
| rust-wycheproof-devel · Fedora 43 | 0.6.0-1.fc43 | FEDORA-2026-9D5B9F45EC | Mar 19, 2026 |
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