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CVE-2026-55199 libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler

🗓️ 17 Jun 2026 18:44:18Reported by VulnCheckType 
cvelist
 cvelist
🔗 www.cve.org👁 35 Views

Pre-authentication DoS in libssh2 via SSH_MSG_EXT_INFO; extension count 0xFFFFFFFF triggers CPU loop.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
githubexploit
GithubExploit
Exploitarium-Detections
28 Jun 202621:36
githubexploit
alpinelinux
AlpineLinux
CVE-2026-55199
17 Jun 202618:44
alpinelinux
cbl_mariner
CBLMariner
CVE-2026-55199 affecting package libssh2 for versions less than 1.11.1-4
8 Jul 202616:02
cbl_mariner
cgr
Chainguard
CVE-2026-55199 vulnerabilities
14 Jul 202614:17
cgr
circl
Circl
CVE-2026-55199
17 Jun 202622:46
circl
cve
CVE
CVE-2026-55199
17 Jun 202618:44
cve
debian
Debian
[SECURITY] [DSA 6365-1] libssh2 security update
25 Jun 202618:20
debian
debiancve
Debian CVE
CVE-2026-55199
17 Jun 202618:44
debiancve
nessus
Tenable Nessus
Debian dsa-6365 : libssh2-1-dev - security update
26 Jun 202600:00
nessus
nessus
Tenable Nessus
Fedora 44 : libssh2 (2026-ca858b3ed8)
29 Jun 202600:00
nessus
Rows per page
[
  {
    "vendor": "libssh2",
    "product": "libssh2",
    "defaultStatus": "unaffected",
    "packageURL": "pkg:github/libssh2/libssh2",
    "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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