PT-2025-45979 · Julia · Libssh2 Jll

Published 2025-10-27 · Updated 2025-10-27

OSV

In libssh2 v1.9.0 and earlier versions, the SSH MSG DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.

Exploit

Related Identifiers

JLSEC-2025-188

Affected Products

Libssh2 Jll

References · 13

• 🔥❌ https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498 · Exploit, Deleted
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TY7EEE34RFKCTXTMBQQWWSLXZWSCXNDB · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22H4Q5XMGS3QNSA7OCL3U7UQZ4NXMR5O · Vendor Advisory
• https://osv.dev/vulnerability/JLSEC-2025-188 · Vendor Advisory
• https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c · Note
• https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480 · Note
• https://lists.debian.org/debian-lts-announce/2019/11/msg00010.html · Note
• http://packetstormsecurity.com/files/172835/libssh2-1.9.0-Out-Of-Bounds-Read.html · Note
• https://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498 · Note
• https://lists.debian.org/debian-lts-announce/2023/09/msg00006.html · Note
• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html · Note
• https://lists.debian.org/debian-lts-announce/2021/12/msg00013.html · Note
• https://security.netapp.com/advisory/ntap-20220909-0004 · Note