CVE-2026-55200

CVE Enrichment

CVSS: 9.2 CRITICAL
EPSS: 3.88%
EPSS Percentile: 90.13%
CISA KEV: Not listed

Description

libssh2 1.11.1, fixed in commit 97acf3d, 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.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: [email protected]
Published: 18-Jun-2026 03:17
Last Modified: 23-Oct-2026 02:17
EPSS Date: 2026-10-25
CWE: CWE-680

CVSS Vector


            CVSS:4.0                            AV:N /
                            AC:L /
                            AT:P /
                            PR:N /
                            UI:N /
                            VC:H /
                            VI:H /
                            VA:H /
                            SC:N /
                            SI:N /
                            SA:N /
                            E:X /
                            CR:X /
                            IR:X /
                            AR:X /
                            MAV:X /
                            MAC:X /
                            MAT:X /
                            MPR:X /
                            MUI:X /
                            MVC:X /
                            MVI:X /
                            MVA:X /
                            MSC:X /
                            MSI:X /
                            MSA:X /
                            S:X /
                            AU:X /
                            R:X /
                            V:X /
                            RE:X /
                            U:X

Affected Products / Versions

libssh2 / libssh2 Source: NVD CPE · affected
Version / affected range: 1.11.1
cpe:2.3:a:libssh2:libssh2:1.11.1:*:*:*:*:*:*:*

References

Last enrichment sync: 03-Nov-2026 06:43
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

[CVE identifiers ] vulnerable packages/critical findings – CVE-2026-55200, CVE-2026-32740, and 2 more CVEs mentioned in the Claude query/results. Sysdig shows AI agents tracing 2,731 vulnerability findings to one approved fix

CVE (1)

Vendors (1)

Products (5)

Tools (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.