Vulnerability-Lookup

FKIE_CVE-2026-50722

Vulnerability from fkie_nvd - Published: 2026-07-02 22:16 - Updated: 2026-07-09 15:47

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected.

References

URL	Tags
d42dc95b-23f1-4e06-9076-20753a0fb0df	https://libreswan.org/security/CVE-2026-50721/CVE-2026-50721.txt	Vendor Advisory, Mailing List
d42dc95b-23f1-4e06-9076-20753a0fb0df	https://libreswan.org/security/CVE-2026-50722/	Vendor Advisory
d42dc95b-23f1-4e06-9076-20753a0fb0df	https://libreswan.org/security/CVE-2026-50722/CVE-2026-50722.txt	Vendor Advisory
d42dc95b-23f1-4e06-9076-20753a0fb0df	https://www.rfc-editor.org/rfc/rfc8017	Technical Description

Impacted products

	Vendor	Product	Version
	libreswan	libreswan	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://github.com/libreswan/libreswan",
          "defaultStatus": "unaffected",
          "packageName": "libreswan",
          "product": "libreswan",
          "programRoutines": [
            {
              "name": "RSA_authenticate_hash_signature_pkcs1_1_5_rsa"
            }
          ],
          "repo": "https://github.com/libreswan/libreswan",
          "vendor": "The Libreswan Project",
          "versions": [
            {
              "lessThanOrEqual": "5.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.3.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libreswan:libreswan:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0D5C4D8F-3003-4ACA-A065-E03AEE680115",
              "versionEndExcluding": "5.3.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected."
    }
  ],
  "id": "CVE-2026-50722",
  "lastModified": "2026-07-09T15:47:00.690",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-50722",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-06T18:12:19.317302Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-02T22:16:43.550",
  "references": [
    {
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
      "tags": [
        "Vendor Advisory",
        "Mailing List"
      ],
      "url": "https://libreswan.org/security/CVE-2026-50721/CVE-2026-50721.txt"
    },
    {
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://libreswan.org/security/CVE-2026-50722/"
    },
    {
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
      "tags": [
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      "url": "https://libreswan.org/security/CVE-2026-50722/CVE-2026-50722.txt"
    },
    {
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
      "tags": [
        "Technical Description"
      ],
      "url": "https://www.rfc-editor.org/rfc/rfc8017"
    }
  ],
  "sourceIdentifier": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        },
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ],
      "source": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
      "type": "Secondary"
    }
  ]
}

CVE-2026-50722 (GCVE-0-2026-50722)

Vulnerability from cvelistv5 – Published: 2026-07-02 21:34 – Updated: 2026-07-07 17:02

Title

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

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-347 - Improper Verification of Cryptographic Signature
CWE-617 - Reachable Assertion

Assigner

libreswan

References

4 references

URL	Tags
https://libreswan.org/security/CVE-2026-50722/CVE…	vendor-advisory
https://libreswan.org/security/CVE-2026-50722/	patch
https://libreswan.org/security/CVE-2026-50721/CVE…	related
https://www.rfc-editor.org/rfc/rfc8017	technical-description

Impacted products

1 product

Vendor	Product	Version
The Libreswan Project	libreswan	Affected: 0 , ≤ 5.3 (semver) Unaffected: 5.3.1 (semver)

Credits

Yeonghyeon Choi Duyeong Kim Andrew Cagney (The Libreswan Team)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-50722",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-06T18:12:19.317302Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-07T17:02:06.722Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/libreswan/libreswan",
          "defaultStatus": "unaffected",
          "packageName": "libreswan",
          "product": "libreswan",
          "programRoutines": [
            {
              "name": "RSA_authenticate_hash_signature_pkcs1_1_5_rsa"
            }
          ],
          "repo": "https://github.com/libreswan/libreswan",
          "vendor": "The Libreswan Project",
          "versions": [
            {
              "lessThanOrEqual": "5.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.3.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "Any server or client that accepts RSA-based IKEv2 connections via the default authby= settings is vulnerable to denial of service. Authentication bypass additionally requires the use of RSA keys with weak exponents (e=3). IKEv2 by default allows ECDSA, RSA-SSA-PSS, and RSA PKCS#1 1.5 as fallback due to Microsoft Windows not supporting RSASSA-PSS."
        }
      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Yeonghyeon Choi"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Duyeong Kim"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "Andrew Cagney (The Libreswan Team)"
        }
      ],
      "descriptions": [
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          "supportingMedia": [
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              "value": "\u003cp\u003eLibreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected.\u003c/p\u003e"
            }
          ],
          "value": "Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "No known exploitation in the wild. The authentication bypass requires the target to use RSA keys with weak exponents (e=3), which have been disallowed by most cryptographic libraries for at least a decade. The denial-of-service attack is exploitable against any IKEv2 configuration using default authby= settings that permit RSA PKCS#1 v1.5 fallback."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-463",
          "descriptions": [
            {
              "lang": "en",
              "value": "Denial of Service via assertion failure in pluto daemon when processing malformed RSA PKCS#1 v1.5 AUTH payloads"
            }
          ]
        },
        {
          "capecId": "CAPEC-473",
          "descriptions": [
            {
              "lang": "en",
              "value": "Authentication bypass via Bleichenbacher-style signature forgery when weak RSA exponents (e.g., e=3) are in use"
            }
          ]
        }
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      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
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          },
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              "value": "Weak RSA exponent (e=3) in use, enabling Bleichenbacher signature forgery"
            }
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        },
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            },
            "type": "vendorSeverity"
          }
        }
      ],
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              "cweId": "CWE-347",
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              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
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        },
        {
          "name": "Libreswan CVE-2026-50722 Patches",
          "tags": [
            "patch"
          ],
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        },
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          "tags": [
            "related"
          ],
          "url": "https://libreswan.org/security/CVE-2026-50721/CVE-2026-50721.txt"
        },
        {
          "name": "RFC 8017 - PKCS #1: RSA Cryptography Specifications Version 2.2",
          "tags": [
            "technical-description"
          ],
          "url": "https://www.rfc-editor.org/rfc/rfc8017"
        }
      ],
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          "lang": "en",
          "supportingMedia": [
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              "base64": false,
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            }
          ],
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        }
      ],
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        "discovery": "EXTERNAL"
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      "taxonomyMappings": [
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          "taxonomyRelations": [
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          "lang": "en",
          "time": "2026-03-24T00:00:00.000Z",
          "value": "Libreswan notified of the issue via security@libreswan.org"
        },
        {
          "lang": "en",
          "time": "2026-06-16T00:00:00.000Z",
          "value": "Advanced notice given to supported customers and distributions"
        },
        {
          "lang": "en",
          "time": "2026-06-24T00:00:00.000Z",
          "value": "Public announcement and release of libreswan 5.3.1"
        }
      ],
      "title": "IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eIf Windows support is not needed, configure \u003ccode\u003eauthby=ecdsa\u003c/code\u003e or \u003ccode\u003eauthby=rsa-sha2\u003c/code\u003e (or both via \u003ccode\u003eauthby=ecdsa,rsa-sha2\u003c/code\u003e) to disallow the fallback of RSA PKCS#1 1.5. The \u003ccode\u003eleftauth=\u003c/code\u003e and \u003ccode\u003erightauth=\u003c/code\u003e settings can be updated similarly if those are in use instead of \u003ccode\u003eauthby\u003c/code\u003e.\u003c/p\u003e"
            }
          ],
          "value": "If Windows support is not needed, configure authby=ecdsa or authby=rsa-sha2 (or both via authby=ecdsa,rsa-sha2) to disallow the fallback of RSA PKCS#1 1.5. The leftauth= and rightauth= settings can be updated similarly if those are in use instead of authby."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
    "assignerShortName": "libreswan",
    "cveId": "CVE-2026-50722",
    "datePublished": "2026-07-02T21:34:41.413Z",
    "dateReserved": "2026-06-05T16:10:05.751Z",
    "dateUpdated": "2026-07-07T17:02:06.722Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

FKIE_CVE-2026-50722

CVE-2026-50722 (GCVE-0-2026-50722)

Tags

Sightings

Nomenclature