CVE-2025-5987
Libssh: invalid return code for chacha20 poly1305 with openssl backend
HIGH 8.1
At a glance
- Source
- NVD
- EPSS
- EPSS 1.73 % · percentile 78 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Modified
Description
A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code, resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior, including compromised data confidentiality and integrity or crashes.
Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2025:23483
- https://access.redhat.com/errata/RHSA-2025:23484
- https://access.redhat.com/errata/RHSA-2026:0427
- https://access.redhat.com/errata/RHSA-2026:0428
- https://access.redhat.com/errata/RHSA-2026:0430
- https://access.redhat.com/errata/RHSA-2026:0431
- https://access.redhat.com/errata/RHSA-2026:0702
- https://access.redhat.com/errata/RHSA-2026:0978
- https://access.redhat.com/errata/RHSA-2026:0980
- https://access.redhat.com/errata/RHSA-2026:0985
- https://access.redhat.com/errata/RHSA-2026:0996
- https://access.redhat.com/errata/RHSA-2026:1539
- https://access.redhat.com/errata/RHSA-2026:1541
- https://access.redhat.com/errata/RHSA-2026:3415
- https://access.redhat.com/security/cve/CVE-2025-5987
- https://bugzilla.redhat.com/show_bug.cgi?id=2376219
- https://www.libssh.org/security/advisories/CVE-2025-5987.txt
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | redhat |
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · secalert@redhat.com (Secondary) |
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · nvd@nist.gov (Secondary) |
European references
- ENISA EUVD · EUVD-2025-20227
- GCVE · GCVE-0-2025-5987
CERT-FR advisories
- CERTFR-2026-AVI-0469 — Multiples vulnérabilités dans Oracle MySQL · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0969 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0907 — Multiples vulnérabilités dans Oracle MySQL · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*≥ 0.10.0 < 0.11.2
Affected products
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |