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CVE-2026-50722 IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload

🗓️ 02 Jul 2026 21:34:41Reported by libreswanType 
cvelist
 cvelist
🔗 www.cve.org👁 5 Views

Libreswan IKEv2 RSA-SHA1 auth flaw enables impersonation and denial of service with a small exponent.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-50722
2 Jul 202621:34
attackerkb
ATTACKERKB
CVE-2026-50721
2 Jul 202621:44
attackerkb
Circl
CVE-2026-50722
2 Jul 202623:21
circl
CVE
CVE-2026-50722
2 Jul 202621:34
cve
EUVD
EUVD-2026-41440
2 Jul 202621:34
euvd
EUVD
EUVD-2026-41441
2 Jul 202621:44
euvd
NVD
CVE-2026-50722
2 Jul 202622:16
nvd
Positive Technologies
PT-2026-55315
2 Jul 202600:00
ptsecurity
Positive Technologies
PT-2026-55316
2 Jul 202600:00
ptsecurity
[
  {
    "vendor": "The Libreswan Project",
    "product": "libreswan",
    "packageName": "libreswan",
    "collectionURL": "https://github.com/libreswan/libreswan",
    "repo": "https://github.com/libreswan/libreswan",
    "versions": [
      {
        "version": "0",
        "status": "affected",
        "lessThanOrEqual": "5.3",
        "versionType": "semver"
      },
      {
        "version": "5.3.1",
        "status": "unaffected",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected",
    "programRoutines": [
      {
        "name": "RSA_authenticate_hash_signature_pkcs1_1_5_rsa"
      }
    ]
  }
]

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