Vulnerability · Published Jun 9, 2026 · Assigned by openssl
CVE-2026-42767NULL Pointer Dereference in CRMF EncryptedValue Decryption
Medium 5.9
In plain English
A medium-severity null pointer dereference in OpenSSL from OpenSSL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | openssl | 1:3.5.5-4.el10_2.alma.1 | ALSA-2026:25237 |
| AlmaLinux:9 | openssl | 1:3.5.5-4.el9_8 | ALSA-2026:25239 |
| AlmaLinux:10 | openssl-devel | 1:3.5.5-4.el10_2.alma.1 | ALSA-2026:25237 |
| AlmaLinux:9 | openssl-devel | 1:3.5.5-4.el9_8 | ALSA-2026:25239 |
| AlmaLinux:10 | openssl-libs | 1:3.5.5-4.el10_2.alma.1 | ALSA-2026:25237 |
| AlmaLinux:9 | openssl-libs | 1:3.5.5-4.el9_8 | ALSA-2026:25239 |
| AlmaLinux:10 | openssl-perl | 1:3.5.5-4.el10_2.alma.1 | ALSA-2026:25237 |
| AlmaLinux:9 | openssl-perl | 1:3.5.5-4.el9_8 | ALSA-2026:25239 |
| Alpine:v3.22 | openssl | 3.5.7-r0 | ALPINE-CVE-2026-42767 |
| Alpine:v3.23 | openssl | 3.5.7-r0 | ALPINE-CVE-2026-42767 |
| Alpine:v3.24 | openssl | 3.5.7-r0 | ALPINE-CVE-2026-42767 |
| Debian:12 | openssl | 3.0.22-1~deb12u1 | DEBIAN-CVE-2026-42767 |
| Debian:13 | openssl | 3.5.6-1~deb13u2 | DEBIAN-CVE-2026-42767 |
| Debian:14 | openssl | 3.6.3-1 | DEBIAN-CVE-2026-42767 |
| Rocky Linux:10 | openssl | 1:3.5.5-4.el10_2 | RLSA-2026:25237 |
| Rocky Linux:9 | openssl | 1:3.5.5-4.el9_8 | RLSA-2026:25239 |
| Ubuntu:24.04:LTS | edk2 | no fix listed | UBUNTU-CVE-2026-42767 |
| Ubuntu:25.10 | edk2 | no fix listed | UBUNTU-CVE-2026-42767 |
| Ubuntu:26.04:LTS | edk2 | no fix listed | UBUNTU-CVE-2026-42767 |
| Ubuntu:26.10 | edk2 | no fix listed | UBUNTU-CVE-2026-42767 |
| Ubuntu:26.04:LTS | edk2-hwe | no fix listed | UBUNTU-CVE-2026-42767 |
| Ubuntu:26.10 | edk2-hwe | no fix listed | UBUNTU-CVE-2026-42767 |
| Ubuntu:22.04:LTS | openssl | 3.0.2-0ubuntu1.25 | UBUNTU-CVE-2026-42767 |
| Ubuntu:24.04:LTS | openssl | 3.0.13-0ubuntu3.11 | UBUNTU-CVE-2026-42767 |
| Ubuntu:25.10 | openssl | 3.5.3-1ubuntu3.4 | UBUNTU-CVE-2026-42767 |
| Ubuntu:26.04:LTS | openssl | 3.5.5-1ubuntu3.2 | UBUNTU-CVE-2026-42767 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- OpenSSL Advisory vendor-advisory
- 4.0.1 git commit patch
- 3.6.3 git commit patch
- 3.5.7 git commit patch
- 3.4.6 git commit patch
- 3.0.21 git commit patch