🛡️ CVE-2026-42767 — openssl

🟡 CVSS 5.9 — Medium ✅ No Known Exploit CWE-476 NVD
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-42767 is classified as CWE-476: NULL Pointer Dereference. A pointer that can be null is used without a check, crashing the process.

Affected software

CVE-2026-42767 is recorded against 2 packages.

  • openssl
  • unknown

Timeline and source

Published on 9 June 2026 and last revised on 23 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
github.com
github.com
github.com
openssl-library.org

CVE-2026-42767 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.9
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-476
Public Exploit ✅ No
Source NVD
Published 2026-06-09
Updated 2026-08-11
Modified 2026-07-23

Affected Packages

Software From version Fixed in
openssl — —
unknown — —

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