🛡️ CVE-2026-55200 on Alpine — libssh2

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Distribution advisory

This page covers CVE-2026-55200 as tracked by Alpine, for the package libssh2. The fix is available in version 1.11.1-r3; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability low.

Affected software

ALPINE-CVE-2026-55200 is recorded against 2 packages.

  • libssh2 (fixed in 1.11.1-r3)
  • rust (fixed in 1.96.1-r0)

Timeline and source

Published on 17 June 2026 and last revised on 19 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-06-17
Updated 2026-08-12
Modified 2026-07-19
Fix URL N/A

Affected Packages

Software From version Fixed in
libssh2 — 1.11.1-r3
rust — 1.96.1-r0

Similar Threats

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