PT-2026-31037 · Openssl+3 · Openssl+3
Igor Morgenstern
·
Published
2026-04-07
·
Updated
2026-05-04
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CVE-2026-28388
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
OpenSSL versions 3.0 through 3.6
Description
A NULL pointer dereference can occur during the processing of a delta CRL containing a Delta CRL Indicator extension if the required CRL Number extension is missing. This can lead to a denial of service. Exploitation requires the X509 V FLAG USE DELTAS flag to be enabled, the certificate being verified to contain a freshestCRL extension or the base CRL to have the EXFLAG FRESHEST flag set, and an attacker providing a malformed CRL. The issue is limited to denial of service and cannot be escalated to code execution or memory disclosure.
Recommendations
OpenSSL versions 3.0 through 3.6: Update to a newer version that contains a fix for this vulnerability.
Fix
DoS
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Ibm Aix
Linuxmint
Openssl
Ubuntu