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CVE-2026-66033 libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation

🗓️ 24 Jul 2026 16:35:28Reported by VulnCheckType 
cvelist
 cvelist
🔗 www.cve.org👁 56 Views

CVE-2026-66033: libssh2 underflow during AES-GCM handshake causes client crash before auth.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-66033
24 Jul 202616:35
attackerkb
alpinelinux
AlpineLinux
CVE-2026-66033
24 Jul 202616:35
alpinelinux
cbl_mariner
CBLMariner
CVE-2026-66033 affecting package libssh2 for versions less than 1.11.1-5
29 Jul 202620:30
cbl_mariner
circl
Circl
CVE-2026-66033
24 Jul 202618:00
circl
cve
CVE
CVE-2026-66033
24 Jul 202616:35
cve
debiancve
Debian CVE
CVE-2026-66033
24 Jul 202616:35
debiancve
euvd
EUVD
EUVD-2026-48720
24 Jul 202616:35
euvd
mscve
Microsoft CVE
libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation
26 Jul 202608:04
mscve
nvd
NVD
CVE-2026-66033
24 Jul 202617:17
nvd
nessus
Tenable Nessus
openSUSE 16 Security Update : libssh2_org (openSUSE-SU-2026:21549-1)
13 Aug 202600:00
nessus
Rows per page
[
  {
    "defaultStatus": "affected",
    "vendor": "libssh2",
    "product": "libssh2",
    "packageURL": "pkg:github/libssh2/libssh2",
    "repo": "https://github.com/libssh2/libssh2",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "versionType": "semver",
        "lessThanOrEqual": "1.11.1"
      },
      {
        "status": "unaffected",
        "version": "a2ed82d40964bbc0d64cd717aa0a5a892117d2e6",
        "versionType": "git"
      }
    ]
  }
]

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28 Jul 2026 01:06Current
CVSS 3.17.5
CVSS 48.7
EPSS0.0037
56