{"id":"JLSEC-2026-661","summary":"libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in...","details":"libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in `ssh2_transport_read()` that fails to enforce upper bounds on `packet_length` field. Remote attackers can send crafted SSH packets with excessively large `packet_length` values to corrupt heap memory and achieve remote code execution.","modified":"2026-07-25T18:24:44.799211143Z","published":"2026-07-10T13:57:40.607Z","upstream":["CVE-2026-55200","GHSA-r8mh-x5qv-7gg2","EUVD-2026-37784"],"database_specific":{"license":"CC-BY-4.0","sources":[{"id":"CVE-2026-55200","imported":"2026-07-17T22:21:25.484Z","modified":"2026-07-14T22:17:17.183Z","published":"2026-06-17T20:17:28.667Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-55200","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55200","database_specific":{"status":"Analyzed"}},{"modified":"2026-06-30T15:30:33Z","published":"2026-06-17T21:34:39Z","url":"https://api.github.com/advisories/GHSA-r8mh-x5qv-7gg2","html_url":"https://github.com/advisories/GHSA-r8mh-x5qv-7gg2","id":"GHSA-r8mh-x5qv-7gg2","imported":"2026-07-17T22:21:25.640Z"},{"imported":"2026-07-17T22:21:33.410Z","modified":"2026-07-14T21:33:55Z","published":"2026-06-17T19:03:15Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-37784","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-37784","id":"EUVD-2026-37784"}]},"references":[{"type":"WEB","url":"https://github.com/advisories/GHSA-r8mh-x5qv-7gg2"},{"type":"WEB","url":"https://github.com/bikini/exploitarium/tree/main/libssh2-cve-2026-55200-poc"},{"type":"WEB","url":"https://github.com/libssh2/libssh2/commit/97acf3dfda80c91c3a8c9f2372546301d4a1a7a8"},{"type":"WEB","url":"https://github.com/libssh2/libssh2/pull/2052"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55200"},{"type":"WEB","url":"https://web.archive.org/web/20260623211210/https://github.com/bikini/exploitarium/tree/main/libssh2-cve-2026-55200-poc"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/libssh2-out-of-bounds-write-via-unchecked-packet-length-in-transport-c"}],"affected":[{"package":{"name":"LibSSH2_jll","ecosystem":"Julia","purl":"pkg:julia/LibSSH2_jll?uuid=29816b5a-b9ab-546f-933c-edad1886dfa8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.11.102+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-661.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/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"}]}