CVE-2026-55200
A remote, anonymous attacker can exploit multiple vulnerabilities in libssh2 to conduct a denial of service attack or execute code.
CSIRTS triage
- What
- Multiple vulnerabilities in libssh2 can lead to denial of service or code execution.
- Who is affected
- Deployments of libssh2 are affected.
- Urgency
- Remediation is high urgency due to the potential for exploitation and high severity.
- Action
- Apply patches as soon as they are available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Moderate exploitation risk2.0% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 79% of all EPSS-scored CVEs.
Advisory coverage (4)
- high[UPDATE] [high] libssh2: Multiple vulnerabilitiescert-bund · 2026-08-25
- unknownDSA-6365-1 libssh2 - security updatedebian · 2026-06-25
- unknownNCSC-2026-0210 [1.01] [M/H] Vulnerabilities fixed in libssh2 by libsshncsc-nl · 2026-06-24
- highCVE-2026-55200: libssh2 - Out-of-Bounds Write via Unchecked packet_length in transport.cmsrc · 2026-06-09
External references
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[](https://www.csirts.com/cve/CVE-2026-55200)