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CVE-2026-34610

5.9 · MEDIUM

The leancrypto library is a cryptographic library that exclusively contains only PQC-resistant cryptographic algorithms.

Published Apr 2, 2026leancryptoCWE-681EPSS 0.17%

Overview

CVE-2026-34610 is a medium-severity vulnerability affecting leancrypto leancrypto. It was published on April 2, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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) length. An attacker who crafts a certificate with CN = victim's CN + 256 bytes padding gets cn_size = (uint8_t)(256 + N) = N, where N is the victim's CN length. The first N bytes of the attacker's CN are the victim's identity. After parsing, the attacker's certificate has an identical CN to the victim's — enabling identity impersonation in PKCS#7 verification, certificate chain matching, and code signing. This issue has been patched in version 1.7.1.

Remediation

Check the references section for vendor advisories and patches from leancrypto. Update leancrypto to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
leancryptoleancrypto>= 0, < 1.7.1Affected

References

GitHubgithub.com/smuellerDD/leancrypto/commit/5cdcbe12bd6c3d6e87e969972a580b44a74c3a6aGitHubgithub.com/smuellerDD/leancrypto/releases/tag/v1.7.1GitHubgithub.com/smuellerDD/leancrypto/security/advisories/GHSA-636g-jxv4-v4gr

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34610?

CVE-2026-34610 is a medium-severity vulnerability affecting leancrypto leancrypto. It was published on April 2, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-34610?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-34610?

Check the references section for vendor advisories and patches from leancrypto. Update leancrypto to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34610?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34610 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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