CVE-2026-28387 Affecting compat-openssl10 package, versions *


Severity

Recommended
0.0
low
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.02% (6th percentile)

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  • Snyk IDSNYK-RHEL8-COMPATOPENSSL10-16000505
  • published13 Apr 2026
  • disclosed7 Apr 2026

Introduced: 7 Apr 2026

NewCVE-2026-28387  (opens in a new tab)
CWE-1341  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 compat-openssl10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream compat-openssl10 package and not the compat-openssl10 package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

Issue summary: An uncommon configuration of clients performing DANE TLSA-based server authentication, when paired with uncommon server DANE TLSA records, may result in a use-after-free and/or double-free on the client side.

Impact summary: A use after free can have a range of potential consequences such as the corruption of valid data, crashes or execution of arbitrary code.

However, the issue only affects clients that make use of TLSA records with both the PKIX-TA(0/PKIX-EE(1) certificate usages and the DANE-TA(2) certificate usage.

By far the most common deployment of DANE is in SMTP MTAs for which RFC7672 recommends that clients treat as 'unusable' any TLSA records that have the PKIX certificate usages. These SMTP (or other similar) clients are not vulnerable to this issue. Conversely, any clients that support only the PKIX usages, and ignore the DANE-TA(2) usage are also not vulnerable.

The client would also need to be communicating with a server that publishes a TLSA RRset with both types of TLSA records.

No FIPS modules are affected by this issue, the problem code is outside the FIPS module boundary.

CVSS Base Scores

version 3.1