{"affected":[{"defaultStatus":"affected","product":"libssh2","source":"CNA: VulnCheck","vendor":"libssh2","versions":[{"lessThanOrEqual":"1.11.1","status":"affected","version":"0","versionType":"semver"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]}],"cveId":"CVE-2026-58051","cwes":["CWE-908"],"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.","epss":{"date":"2026-11-09","percentile":0.2022,"score":0.00277},"exploits":[{"kind":"exploit","source":"CNA: VulnCheck","url":"https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc"}],"kev":null,"metrics":[{"score":6.5,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},{"score":8.3,"severity":"high","source":"CNA: VulnCheck","vector":"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","version":"4.0"}],"modifiedAt":1794314939666,"publishedAt":1782610374283,"references":[{"source":"CNA: VulnCheck","tags":["exploit","third-party-advisory"],"url":"https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/libssh2/libssh2/blob/master/src/publickey.c"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup"},{"source":"ADP: siemens-SADP","tags":[],"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}],"remediation":[],"revision":"4f36a2d06e668c18e01299b550565891088999aea44cd03eceaa6d794679c043","sources":[{"modifiedAt":1794314939666,"name":"CNA: VulnCheck","retrievedAt":1794316721137,"url":"https://www.cve.org/CVERecord?id=CVE-2026-58051"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794316749271,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-58051"}],"ssvc":{"assessedAt":1782737370651,"automatable":"no","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"libssh2 - Free of Uninitialized Pointer in publickey List Cleanup","updatedAt":1794316749271}