What is CVE-2026-34610?

CVE-2026-34610 is a medium-severity vulnerability in Smuellerdd Leancrypto, classified under Incorrect Conversion between Numeric Types. CVSS score: 5.9/10. Published 2026-04-02.

How severe is CVE-2026-34610?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Smuellerdd Leancrypto

CVE-2026-34610

The leancrypto library is a cryptographic library that exclusively contains only PQC-resistant cryptographic algorithms. Prior to version 1.7.1, lc_x509_extract_name_segment() casts size_t vlen to uint8_t when storing the Common Name (CN)…

EPSS: 0.000 (6.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Smuellerdd Leancrypto — versions < 1.7.1

Weakness classification (CWE)

CWE-681 — Incorrect Conversion between Numeric Types

References

https://github.com/smuellerDD/leancrypto/security/advisories/GHSA-636g-jxv4-v4gr (x_refsource_CONFIRM)
https://github.com/smuellerDD/leancrypto/commit/5cdcbe12bd6c3d6e87e969972a580b44a74c3a6a (x_refsource_MISC)
https://github.com/smuellerDD/leancrypto/releases/tag/v1.7.1 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34610?: CVE-2026-34610 is a medium-severity vulnerability in Smuellerdd Leancrypto, classified under Incorrect Conversion between Numeric Types. CVSS score: 5.9/10. Published 2026-04-02.
How severe is CVE-2026-34610?: Medium severity. CVSS v3 base score is 5.9 out of 10.