NULL Pointer Dereference Affecting openssl package, versions [,3.0.20)[3.1.0,3.3.7)[3.4.0,3.4.5)[3.5.0,3.5.6)[3.6.0,3.6.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published8 Apr 2026
- disclosed7 Apr 2026
- creditIgor Morgenstern
Introduced: 7 Apr 2026
NewCVE-2026-28388 (opens in a new tab)How to fix?
Upgrade openssl to version 3.0.20, 3.3.7, 3.4.5, 3.5.6, 3.6.2 or higher.
Overview
Affected versions of this package are vulnerable to NULL Pointer Dereference in the delta CRL processing when the required CRLNumber extension is missing. An attacker can cause an application crash by supplying a specially crafted malformed CRL file.
Note:
This is only exploitable if the X509_V_FLAG_USE_DELTAS flag is enabled in the verification context, the certificate being verified contains a freshestCRL extension or the base CRL has the EXFLAG_FRESHEST flag set, and the application processes the attacker-supplied CRL.