Incorrect Conversion between Numeric Types Affecting smuellerDD/leancrypto package, versions [,1.7.1)
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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- published13 Apr 2026
- disclosed2 Apr 2026
- creditSeunghyun Yoon, SunwooLee
Introduced: 2 Apr 2026
CVE-2026-34610 (opens in a new tab)How to fix?
Upgrade smuellerDD/leancrypto to version 1.7.1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Conversion between Numeric Types in the lc_x509_extract_name_segment() function. An attacker can impersonate another certificate's identity by crafting a certificate with a Common Name field that includes the victim's name followed by 256 bytes of padding, causing the length to be truncated and resulting in a certificate that appears to have the same identity as the victim during certificate verification processes.