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CVE-2025-5987

Medium

Elevated severity or exploit probability.

CVSS base
8.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
1.5%
73.0th percentile
CISA KEV
Not listed
Weakness / dates
CWE-393
Published 2025-07-07 · modified 2026-08-31

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.

Affected

libssh

References

Official: NVD · CVE.org