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Affected Component
Analysis
libssh2
Exploitable
Name
CVE-2026-66033
Description
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.
CWEs
Published Date
Updated Date
Workaround
-
Analysis#
Vulnerability Ratings#
8.7
CVSSv4
7.5
CVSSv31
NaN
other
Others affected components#
Resolved with patches#
libssh2 (buildroot:master)
#
Title
Author
Resolve
1
openssl: fix potential OOB read/write with AES-GCM in
Viktor Szakats <commit@vsz.me>
CVE-2026-66033
libssh2 (yocto:master)
#
Title
Author
Resolve
1
openssl: fix potential OOB read/write with AES-GCM in
Viktor Szakats <commit@vsz.me>
CVE-2026-66033