Out-of-bounds Read Affecting openssl package, versions [4.0.0,4.0.1)
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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Test your applications- Snyk IDSNYK-UNMANAGED-OPENSSL-17277166
- published10 Jun 2026
- disclosed9 Jun 2026
- creditZero Day Initiative
Introduced: 9 Jun 2026
NewCVE-2026-42771 (opens in a new tab)How to fix?
Upgrade openssl to version 4.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read in X509_VERIFY_PARAM_set1_email(). An attacker supplying a malicious email address, such as a From: address during S/MIME validation, can cause an internal helper to use the wrong length when validating the local part, so the 64-octet limit is not enforced, crashing the application.