CVE-2026-34610

Katalog CVE

CVSS 5.9 · Medium EPSS 0,26%

Kerentanan Incorrect Conversion between Numeric Types pada leancrypto. Skor CVSS 3.1 5.9 (Medium) menurut github.com.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

2 April 2026

Terakhir diubah

24 Juli 2026

Status NVD

Analyzed

CVSS 3.1

5.9 (Medium), sumber github.com
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-681: Incorrect Conversion between Numeric Types

EPSS (30 hari)

0,26% peluang dieksploitasi; lebih tinggi dari 16,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/smuellerDD/leancrypto/security/advisories/GHSA-636g-jxv4-v4gr advisory vendor
• https://github.com/smuellerDD/leancrypto/commit/5cdcbe12bd6c3d6e87e969972a580b44a74c3a6a patch
• https://github.com/smuellerDD/leancrypto/releases/tag/v1.7.1 product · release notes