NULL Pointer Dereference Affecting openssl-devel package, versions <1:3.5.5-1.amzn2023.0.5


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

Social Trends
EPSS
0.35% (27th percentile)

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  • Snyk IDSNYK-AMZN2023-OPENSSLDEVEL-17415697
  • published23 Jun 2026
  • disclosed9 Jun 2026

Introduced: 9 Jun 2026

NewCVE-2026-42767  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 openssl-devel to version 1:3.5.5-1.amzn2023.0.5 or higher.
This issue was patched in ALAS2023-2026-1853.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl-devel package and not the openssl-devel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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 Base Scores

version 3.1