CVE-2026-42765 Affecting openssl package, versions <3.6.3-r0
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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- published11 Jun 2026
- disclosed9 Jun 2026
Introduced: 9 Jun 2026
NewCVE-2026-42765 (opens in a new tab)How to fix?
Upgrade Wolfi openssl to version 3.6.3-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Wolfi.
See How to fix? for Wolfi relevant fixed versions and status.
Issue summary: When a partial-chain certificate verification is enabled together with OCSP response checking for the whole chain, a NULL dereference will happen if the verified chain does not have a self-signed trusted anchor, crashing the process.
Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service for an application.
When performing OCSP response checking for certificates in the verification chain, the code always tries to access the next certificate as the issuer. There is a check for a self-signed certificate. However with the partial chain verification enabled when the chain does not have a self-signed trusted anchor, the issuer will be NULL for the last certificate in the chain. A NULL pointer dereference then happens.
This issue affects only applications which enable both OCSP verification of the certificate chain (X509_V_FLAG_OCSP_RESP_CHECK_ALL) and partial chain verification (X509_V_FLAG_PARTIAL_CHAIN) in the certificate verification. Both flags are disabled by default. For that reason, we have assigned Low severity to the issue.
No FIPS modules are affected by this issue as the affected code is outside the OpenSSL FIPS module boundary.
References
- https://github.com/openssl/security/commit/14340b7fa1d444615486bc137014b064e64ec334
- https://github.com/openssl/security/commit/eb345da18ce2216b2f3ade9c2bc23e068487fa97
- https://github.com/openssl/openssl/commit/14340b7fa1d444615486bc137014b064e64ec334
- https://github.com/openssl/openssl/commit/eb345da18ce2216b2f3ade9c2bc23e068487fa97
- https://openssl-library.org/news/secadv/20260609.txt