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CVE-2026-55199

🗓️ 17 Jun 2026 18:44:18Reported by VulnCheckType 
cve
 cve
🔗 web.nvd.nist.gov👁 5 Views

CVE-2026-55199 affects libssh2 up to version 1.11.1. The vulnerability lies in the SSH_MSG_EXT_INFO handler (src/packet.c), where return values from _libssh2_get_string() are unchecked. During key exchange, a malicious SSH server can set nr_extens...

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
Circl
CVE-2026-55199
17 Jun 202622:46
circl
Cvelist
CVE-2026-55199 libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler
17 Jun 202618:44
cvelist
EUVD
EUVD-2026-37782
17 Jun 202618:44
euvd
NVD
CVE-2026-55199
17 Jun 202620:17
nvd
Positive Technologies
PT-2026-50527
17 Jun 202600:00
ptsecurity
Vulners
CNA
Node
libssh2libssh2Range01.11.1
[
  {
    "vendor": "libssh2",
    "product": "libssh2",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "0",
        "status": "affected",
        "versionType": "semver",
        "lessThanOrEqual": "1.11.1"
      },
      {
        "status": "unaffected",
        "version": "17626857d20b3c9a1addfa45979dadcee1cd84a4",
        "versionType": "git"
      }
    ],
    "repo": "https://github.com/libssh2/libssh2"
  }
]

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17 Jun 2026 20:17Current
5.3Medium risk
Vulners AI Score5.3
CVSS 3.15.9
CVSS 48.2
5