Bug 2490127 (CVE-2026-55200) - CVE-2026-55200 libssh2: libssh2 - Out-of-Bounds Write via Unchecked packet_length in transport.c
Summary: CVE-2026-55200 libssh2: libssh2 - Out-of-Bounds Write via Unchecked packet_le...
Keywords:
Status: NEW
Alias: CVE-2026-55200
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2491737 2491736 2491738
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-17 20:01 UTC by OSIDB Bzimport
Modified: 2026-06-29 15:58 UTC (History)
7 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-06-17 20:01:40 UTC 
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.
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