{"id":"AZL-93393","summary":"CVE-2026-66034 affecting package libssh2 for versions less than 1.11.1-5","details":"libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an uninitialized pointer via the publickey subsystem. In libssh2_publickey_list_fetch(), the version 1 response parser reads a server-controlled comment_len value and advances the parse pointer without verifying sufficient bytes remain in the buffer, causing the out-of-bounds read to leak heap pointers from adjacent allocations defeating ASLR, followed by heap allocator state corruption when the error cleanup path frees an uninitialized pointer from a non-zeroed realloc() region.","modified":"2026-09-01T05:28:09Z","published":"2026-07-24T17:17:35Z","upstream":["CVE-2026-66034"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66034"}],"affected":[{"package":{"name":"libssh2","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/libssh2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-5"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-93393.json"}}],"schema_version":"1.9.0"}