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CVE-2026-55199

MEDIUM · CVSS 5.9 EPSS %0.41 Public Exploit

Kaynak: NVD + CISA KEV + EPSS · Yayınlanma: 2026-06-17T20:17:28.520 · Çekilme zamanı: 2026-06-30T12:25:57.686182+00:00

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Detaylı analiz gerekiyor.

Public Exploit Sinyali

Bu CVE için açıklama veya referanslarda public exploit / PoC / GitHub / Metasploit sinyali tespit edildi.

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CVE
CVE-2026-55199
Severity
MEDIUM
CVSS
5.9
EPSS
%0.41
Exchange

Orijinal NVD Açıklaması

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.