Is there a public exploit for CVE-2026-58051?

No public exploit for CVE-2026-58051 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-58051?

CVE-2026-58051 scores CVSS 8.3 (v4.0), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.28%.

What does CVE-2026-58051 affect?

CVE-2026-58051 affects libssh2 libssh2.

8.3 High

libssh2 through 1.11.1 grows its publickey list with SSH2REALLOC but does not zero-initialize new entries before parsing populates them, so…

CVE-2026-58051

libssh2 through 1.11.1 grows its publickey list with SSH2REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2publickeylistfree 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.

Assessment

CVSS: 8.3 (v4.0)
Severity: High
EPSS: 0.28% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 28 June 2026
Last updated: 10 November 2026
Affected: libssh2 · libssh2
Assigner: VulnCheck

CVSS vectorCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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