Vulnerability-Lookup

GHSA-JF6R-WR9W-J67C

Vulnerability from github – Published: 2026-10-14 00:31 – Updated: 2026-10-14 00:31

Details

Libreswan has a null pointer dereference bug in the PKCS#7 handling code for IKE certificate authentication. When libreswan decodes an IKE CERT payload of type CERT_PKCS7_WRAPPED_X509, it guards the PKCS#7 blob with SEC_PKCS7ContainsCertsOrCrls() and then iterates the certificate list with SEC_PKCS7GetCertificateList(). The two NSS APIs disagree on a SignedData that carries a CRL but no certificates: ContainsCertsOrCrls() returns PR_TRUE (there is a CRL), so the guard passes, but GetCertificateList() returns NULL (there are no certificates). This causes libreswan to dereference a null pointer leading to a crash and restart. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. No remote code execution is possible. Continued exploitation can cause a denial of service.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-77207"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-252"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-13T22:18:26Z",
    "severity": "HIGH"
  },
  "details": "Libreswan has a null pointer dereference bug in the PKCS#7 handling code for IKE certificate authentication. When libreswan decodes an IKE CERT payload of type CERT_PKCS7_WRAPPED_X509, it guards the PKCS#7 blob with SEC_PKCS7ContainsCertsOrCrls() and then iterates the certificate list with SEC_PKCS7GetCertificateList(). The two NSS APIs disagree on a SignedData that carries a CRL but no certificates: ContainsCertsOrCrls() returns PR_TRUE (there is a CRL), so the guard passes, but GetCertificateList() returns NULL (there are no certificates). This causes libreswan to dereference a null pointer leading to a crash and restart. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. No remote code execution is possible. Continued exploitation can cause a denial of service.",
  "id": "GHSA-jf6r-wr9w-j67c",
  "modified": "2026-10-14T00:31:47Z",
  "published": "2026-10-14T00:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77207"
    },
    {
      "type": "WEB",
      "url": "https://libreswan.org/security/CVE-2026-77207"
    },
    {
      "type": "WEB",
      "url": "https://libreswan.org/security/CVE-2026-77207/CVE-2026-77207.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-77207 (GCVE-0-2026-77207)

Vulnerability from cvelistv5 – Published: 2026-10-13 21:28 – Updated: 2026-10-16 15:31

Title

Null Pointer Dereference in PKCS#7 bundle with no certificates

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-16 15:14 UTC

CWE

CWE-476 - Null Pointer Dereference
CWE-252 - Unchecked Return Value

Assigner

libreswan CNA under the mitre root

CNA scorecard – unranked: 8 records in the last 180 days, 10 needed details

References

2 references

URL	Tags
https://libreswan.org/security/CVE-2026-77207/CVE…	vendor-advisory
https://libreswan.org/security/CVE-2026-77207/	patch

Impacted products

1 product

Vendor	Product	Version
The Libreswan Project	libreswan	Affected: 4.7 , ≤ 5.3.2 (semver) Affected: 5.4 , ≤ 5.4 (semver) Unaffected: 5.3.3 (semver) Unaffected: 5.4.1 (semver)

Credits

Claude (Anthropic) David Korczynski (ADA Logics Ltd)

Show details on NVD website

JSON

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                "id": "CVE-2026-77207",
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                  },
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                "timestamp": "2026-10-16T15:14:50.209248Z",
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      "timeline": [
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          "lang": "en",
          "time": "2026-08-05T00:00:00.000Z",
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          "lang": "en",
          "time": "2026-09-24T00:00:00.000Z",
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        },
        {
          "lang": "en",
          "time": "2026-10-05T00:00:00.000Z",
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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.

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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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