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CVE-2026-58051

8.3 high SSVC exploitation: poc Analyzed
NVD · CVE.org

libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 1

  1. First seenCVSS 8.3 · libssh2NVD modified 2026-10-25 17:10

Affected (CPE criteria) 1

  • cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*

References 3