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  4. CVE 2026 77207 null pointer dereference in pkcs7 bundle with no
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Back to active CVEs
High · CVSS 7.5CVE-2026-77207

Null Pointer Dereference in PKCS#7 bundle with no certificatesCVE-2026-77207

Answer in brief

CVE-2026-77207 records a High severity (CVSS 7.5) vulnerability in Null Pointer Dereference in PKCS#7 bundle with no certificates. The current sources do not mark it as known exploited. The current feed maps The Libreswan Project/libreswan (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 13, 2026Updated Oct 13, 2026Source checked Oct 13, 2026First seen by HOL Oct 13, 2026Material review Oct 13, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps The Libreswan Project/libreswan (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
The Libreswan Project/libreswangeneric>=4.7 <=5.3.2 || >=5.4 <=5.4Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for The Libreswan Project/libreswan.
  2. 2Review the reported fix. Source-reported solution: Upgrade to libreswan 5.3.3 or 5.4.1 or later. Patches are available at https://libreswan.org/security/CVE-2026-77207/

Evidence timeline and material changes

  1. Published upstream

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 13, 2026

Sources and claim methodology

  • Source referencelibreswan.org
  • Source referencelibreswan.org
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Denial of Service via sending bogus X.509 certificatesSame the libreswan project/libreswan package
  • IKEv2 pre-authentication Null Pointer Dereference in EAP codeSame the libreswan project/libreswan package
  • IKEv2 Use-After-Free bug when using IKE-over-TCPSame the libreswan project/libreswan package
  • Substance3D - Designer | NULL Pointer Dereference (CWE-476)Also CWE-476
  • Substance3D - Designer | NULL Pointer Dereference (CWE-476)Also CWE-476
  • CAI Content Credentials | Improper Input Validation (CWE-20)Same generic ecosystem

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-476, CWE-252
Source
CVE List V5
Source checked
Oct 13, 2026
References
2 linked sources
Open source record