PT-2026-50527 · Libssh2+1 · Libssh2+1
CVSS v4.0
8.2
High
| Vector | AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
Name of the Vulnerable Software and Affected Versions
libssh2 versions prior to 1.11.1
Description
A pre-authentication denial of service issue exists in the SSH MSG EXT INFO handler within
src/packet.c. A malicious SSH server can trigger a CPU exhaustion loop on the client by sending a crafted extension count value. Specifically, by setting nr extensions to 0xFFFFFFFF during key exchange, the client enters a tight CPU loop for over 60 seconds because return values from the libssh2 get string() function are unchecked and session timeouts do not apply to CPU-bound loops.Recommendations
Update to the version containing commit 1762685.
Exploit
Fix
DoS
Infinite Loop
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Weakness Enumeration
Related Identifiers
Affected Products
Linuxmint
Libssh2