CVE-2026-42766 The advisory has been revoked - it doesn't affect any version of package openssl (opens in a new tab)
Threat Intelligence
This vulnerability is trending on Twitter; this may indicate a growing threat.
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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Test your applications- Snyk IDSNYK-UBUNTU2604-OPENSSL-17269145
- published10 Jun 2026
- disclosed9 Jun 2026
Introduced: 9 Jun 2026
NewCVE-2026-42766 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:26.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Ubuntu.
Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption.
Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service.
The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it was present.
An attacker who supplies such a CMS message to an application performing password-based CMS decryption can trigger an application crash, leading to a Denial of Service.
Applications that process password-encrypted CMS messages may be affected.
The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2026-42766
- https://github.com/openssl/security/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce
- https://github.com/openssl/security/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4
- https://github.com/openssl/security/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7
- https://github.com/openssl/security/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4
- https://github.com/openssl/security/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8
- https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce
- https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4
- https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7
- https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4
- https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8
- https://openssl-library.org/news/secadv/20260609.txt