CVE-2026-58051
mediumpriority · track · 0EPSS 0.003 · 20 %ileDEEUFRRUUSEPSS · scored 2026-10-26
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.8–8.3
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (14)
Products and version ranges known to be affected.
advisories (3)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-2099libssh2: Mehrere SchwachstellenDeutsch2026-06-28csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in libssh2 ausnutzen, um Dateien zu manipulieren, Speicherbeschädigungen zu verursachen, einen Denial-of-Service-Zustand auszulösen oder andere, nicht näher spezifizierte Auswirkungen zu erzielen.
- CERTFR-2026-AVI-1352Multiples vulnérabilités dans Oracle PeopleSoftFrançais2026-10-21vendor · certfrFR
- CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (9)
External citations — patches, advisories, analysis.
- https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poccnnvd
- https://github.com/libssh2/libssh2/blob/master/src/publickey.ccnnvd
- https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanupcnnvd
- https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-pocenisa_euvd
- https://github.com/libssh2/libssh2/blob/master/src/publickey.cenisa_euvd
- https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanupenisa_euvd
- https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-pocBroken Linknvd
- https://github.com/libssh2/libssh2/blob/master/src/publickey.cProductnvd
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