CVE-2026-34610 is a type confusion vulnerability affecting the leancrypto cryptographic library, specifically versions prior to 1.7.1. It allows an attacker to craft a malicious X.509 certificate with a specially padded Common Name (CN) that, due to an incorrect length cast, can impersonate a legitimate identity during PKCS#7 verification, certificate chain matching, and code signing. Rated Medium with a CVSS score of 5.9, this vulnerability has a high integrity impact and can be exploited remotely, though it requires high attack complexity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion regarding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.7.1CPE matchmatch criteria | cpe:2.3:a:leancrypto:leancrypto:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
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