CVE-2026-58051

6.5 Moyenne

Publiée le 28/06/2026 à 04:16 · Modifiée le 30/06/2026 à 19:42 · Analysée par le NVD · Source : disclosure@vulncheck.com

Description

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.

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Produits concernés

Scores CVSS

Version	Score	Source	Vecteur
4.0	8.3 Élevée	disclosure@vulncheck.com	`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X`
3.1	6.5 Moyenne	disclosure@vulncheck.com	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H`

Faiblesses (CWE)

CWE-908

Références

https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc Broken Link
https://github.com/libssh2/libssh2/blob/master/src/publickey.c Product
https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup Third Party Advisory

CVE-2026-58051

Description

Produits concernés

Scores CVSS

Faiblesses (CWE)

Références

Ailleurs