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THREAT OPS › Threat News › [NVD] CVE-2026-55200 (HIGH 8.1) — libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt h

[NVD] CVE-2026-55200 (HIGH 8.1) — libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt h

lownvdPublished 2026-06-17

CVE-2026-55200 CVSS: 8.1 HIGH Published: 2026-06-17T20:17:28.667

libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.

Indicators of compromise

CVE-2026-55200cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-55200