Libssh: invalid return code for chacha20 poly1305 with openssl backend
CVE-2025-5987 is fixed in 7 products on 1 platform, first by RHSA-2026:0427, released April 26, 2025. It is not reported as exploited. Patch Radar priority: High.
A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSLlibrary. If an attacker manages to exhaust the heap space, this error isnot detected and may lead to libssh using a partially initialized ciphercontext. This occurs because the OpenSSL error code returned aliases withthe SSH_OK code, resulting in libssh not properly detecting the errorreturned by the OpenSSL library. This issue can lead to undefined behavior,including compromised data confidentiality and integrity or crashes.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libssh · Debian 12.15 (bookworm) | 0.10.6-0+deb12u2 | DEBIAN-CVE-2025-5987 | Jul 7, 2025 |
| libssh · Debian 13.5 (trixie) | 0.11.2-1 | DEBIAN-CVE-2025-5987 | Jul 7, 2025 |
| libssh · Debian 14 | 0.11.2-1 | DEBIAN-CVE-2025-5987 | Jul 7, 2025 |
| libssh · RHEL 10 | 0.11.1-4.el10_0.1 | RHSA-2026:0427 | Apr 26, 2025 |
| libssh · RHEL 9 | 0:0.10.4-17.el9_7 | RHSA-2025:23483 | Jan 16, 2026 |
| libssh · almalinux 9 | 0.10.4-17.el9_7 | ALSA-2025:23483 | Dec 17, 2025 |
| libssh · amzn 2023 | 0.10.6-1.amzn2023.0.2 | ALAS2023-2025-1155 | Aug 18, 2025 |
| libssh · ol 10 | 0:0.11.1-5.el10_1 | ELSA-2025-23484 | Dec 17, 2025 |
| libssh · ol 9 | 0:0.10.4-17.el9_7 | ELSA-2025-23483 | Dec 18, 2025 |
| libssh · rocky 10 | 0:0.11.1-5.el10_1 | RLSA-2025:23484 | Dec 18, 2025 |
| libssh · rocky 9 | 0:0.10.4-17.el9_7 | RLSA-2025:23483 | Dec 19, 2025 |
| libssh-4 · Ubuntu 24.04.5 LTS (noble) | 0.10.6-2ubuntu0.1 | libssh-4 0.10.6-2ubuntu0.1 | Jun 24, 2025 |
| libssh-4 · Ubuntu 24.10 (oracular) | 0.10.6-3ubuntu1.1 | libssh-4 0.10.6-3ubuntu1.1 | Jun 25, 2025 |
| libssh-4 · Ubuntu 25.04 (plucky) | 0.11.1-1ubuntu0.1 | libssh-4 0.11.1-1ubuntu0.1 | Jun 25, 2025 |
| libssh-config · RHEL 9 | 0:0.10.4-17.el9_7 | RHSA-2025:23483 | Jan 16, 2026 |
| libssh-config · almalinux 10 | 0.11.1-5.el10_1 | ALSA-2025:23484 | Dec 17, 2025 |
| libssh-config · almalinux 9 | 0.10.4-17.el9_7 | ALSA-2025:23483 | Dec 17, 2025 |
| libssh-config · amzn 2023 | 0.10.6-1.amzn2023.0.2 | ALAS2023-2025-1155 | Aug 18, 2025 |
| libssh-config · ol 10 | 0:0.11.1-5.el10_1 | ELSA-2025-23484 | Dec 17, 2025 |
| libssh-config · ol 9 | 0:0.10.4-17.el9_7 | ELSA-2025-23483 | Dec 18, 2025 |
| libssh-debuginfo · amzn 2023 | 0.10.6-1.amzn2023.0.2 | ALAS2023-2025-1155 | Aug 18, 2025 |
| libssh-debugsource · amzn 2023 | 0.10.6-1.amzn2023.0.2 | ALAS2023-2025-1155 | Aug 18, 2025 |
| libssh-devel · RHEL 9 | 0:0.10.4-17.el9_7 | RHSA-2025:23483 | Jan 16, 2026 |
| libssh-devel · almalinux 9 | 0.10.4-17.el9_7 | ALSA-2025:23483 | Dec 17, 2025 |
| libssh-devel · amzn 2023 | 0.10.6-1.amzn2023.0.2 | ALAS2023-2025-1155 | Aug 18, 2025 |
| libssh-devel · ol 10 | 0:0.11.1-5.el10_1 | ELSA-2025-23484 | Dec 17, 2025 |
| libssh-devel · ol 9 | 0:0.10.4-17.el9_7 | ELSA-2025-23483 | Dec 18, 2025 |
| libssh-gcrypt-4 · Ubuntu 24.04.5 LTS (noble) | 0.10.6-2ubuntu0.1 | libssh-gcrypt-4 0.10.6-2ubuntu0.1 | Jun 24, 2025 |
| libssh-gcrypt-4 · Ubuntu 24.10 (oracular) | 0.10.6-3ubuntu1.1 | libssh-gcrypt-4 0.10.6-3ubuntu1.1 | Jun 25, 2025 |
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