CVE-2026-42767

MEDIUM EPSS 26.8%
Published Jun 9, 20262w ago · Modified Jun 17, 20261w ago
5.9 CVSS 3.1
Medium
Find Similar
Published Jun 9, 2026 2w ago
Last Modified Jun 17, 2026 1w ago

Description

Issue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL pointer dereference in a CMP client application. Impact summary: A NULL pointer dereference causes a crash of the application and a Denial of Service. An attacker controlling a CMP server (or acting as a man-in-the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format) CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs, causing a crash of the CMP client. Applications that process untrusted CMP/CRMF messages may be affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS Details

Base Score
5.9
Exploitability
2.2
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
26.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 5

VendorProductVersionRange
opensslopenssl*≥3.0.0  –  <3.0.21
opensslopenssl*≥3.4.0  –  <3.4.6
opensslopenssl*≥3.5.0  –  <3.5.7
opensslopenssl*≥3.6.0  –  <3.6.3
opensslopenssl4.0.0any

References 6

  • github.com https://github.com/openssl/openssl/commit/61a86a8cd73546c9fea916f3d304c1293e05c046
    Patch
  • github.com https://github.com/openssl/openssl/commit/665d5254083affde9982efca7c41dd01cacc8774
    Patch
  • github.com https://github.com/openssl/openssl/commit/810b722f772652ad48042bcc7ab07e3414b11d0f
    Patch
  • github.com https://github.com/openssl/openssl/commit/b90ff3b1bd33b1c18e6a09936d097c2eddef8873
    Patch
  • github.com https://github.com/openssl/openssl/commit/e6f912907fc2ec82a0fd07aae55172c5e5e3d90d
    Patch
  • openssl-library.org https://openssl-library.org/news/secadv/20260609.txt
    Vendor Advisory

Remediation

  • github.com https://github.com/openssl/openssl/commit/61a86a8cd73546c9fea916f3d304c1293e05c046
    Patch
  • github.com https://github.com/openssl/openssl/commit/665d5254083affde9982efca7c41dd01cacc8774
    Patch
  • github.com https://github.com/openssl/openssl/commit/810b722f772652ad48042bcc7ab07e3414b11d0f
    Patch
  • github.com https://github.com/openssl/openssl/commit/b90ff3b1bd33b1c18e6a09936d097c2eddef8873
    Patch
  • github.com https://github.com/openssl/openssl/commit/e6f912907fc2ec82a0fd07aae55172c5e5e3d90d
    Patch