Loop with Unreachable Exit Condition ('Infinite Loop') Affecting libssh2-devel package, versions <1.11.0-150200.9.5.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.92% (57th percentile)

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  • Snyk IDSNYK-SLES155-LIBSSH2DEVEL-17999939
  • published17 Jul 2026
  • disclosed16 Jul 2026

Introduced: 16 Jul 2026

NewCVE-2026-55199  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade SLES:15.5 libssh2-devel to version 1.11.0-150200.9.5.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libssh2-devel package and not the libssh2-devel package as distributed by SLES. See How to fix? for SLES:15.5 relevant fixed versions and status.

libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not apply to CPU-bound loops.

CVSS Base Scores

version 3.1