CVE-2026-28388 Affecting libopenssl1_0_0 package, versions <1.0.2p-150000.3.108.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.89% (57th percentile)

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  • Snyk IDSNYK-SLES156-LIBOPENSSL100-17342570
  • published16 Jun 2026
  • disclosed15 Jun 2026

Introduced: 15 Jun 2026

CVE-2026-28388  (opens in a new tab)

How to fix?

Upgrade SLES:15.6 libopenssl1_0_0 to version 1.0.2p-150000.3.108.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libopenssl1_0_0 package and not the libopenssl1_0_0 package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

Issue summary: When a delta CRL that contains a Delta CRL Indicator extension is processed a NULL pointer dereference might happen if the required CRL Number extension is missing.

Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service for an application.

When CRL processing and delta CRL processing is enabled during X.509 certificate verification, the delta CRL processing does not check whether the CRL Number extension is NULL before dereferencing it. When a malformed delta CRL file is being processed, this parameter can be NULL, causing a NULL pointer dereference.

Exploiting this issue requires the X509_V_FLAG_USE_DELTAS flag to be enabled in the verification context, the certificate being verified to contain a freshestCRL extension or the base CRL to have the EXFLAG_FRESHEST flag set, and an attacker to provide a malformed CRL to an application that processes it.

The vulnerability is limited to Denial of Service and cannot be escalated to achieve code execution or memory disclosure. For that reason the issue was assessed as Low severity according to our Security Policy.

The FIPS modules in 3.6, 3.5, 3.4, 3.3 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