CVE Watch24 jul 2026

CVE-2026-66033

libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2_cipher_crypt() fu

CVSS

7.5

Alto

EPSS

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KEV

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Exploit Today

0-100

Publicado: 24 jul 2026 · Última mod.: 24 jul 2026 · CWE-125 · CWE-191

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2_cipher_crypt() function in src/openssl.c that allows a malicious SSH server to crash any connecting client by negotiating AES-GCM ciphers during handshake. Attackers can exploit the underflow in the expression computing blocksize minus aadlen minus authentication tag length to trigger an out-of-bounds read and a memcpy call with a near-SIZE_MAX length argument, causing immediate process crash before any authentication occurs.

Referencias oficiales

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