🛡️ CVE-2023-39969 — uthenticode

🔴 CVSS 9.0 — Critical ✅ No Known Exploit CWE-347 NVD
9.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

uthenticode is a small cross-platform library for partially verifying Authenticode digital signatures. Version 1.0.9 of uthenticode hashed the entire file rather than hashing sections by virtual address, in violation of the Authenticode specification. As a result, an attacker could modify code within a binary without changing its Authenticode hash, making it appear valid from uthenticode's perspective. Versions of uthenticode prior to 1.0.9 are not vulnerable to this attack, nor are versions in the 2.x series. By design, uthenticode does not perform full-chain validation. However, the malleability of signature verification introduced in 1.0.9 was an unintended oversight. The 2.x series addresses the vulnerability. Versions prior to 1.0.9 are also not vulnerable, but users are encouraged to upgrade rather than downgrade. There are no workarounds to this vulnerability.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2023-39969 is classified as CWE-347: Improper Verification of Cryptographic Signature. A signature is not checked correctly, so forged or modified content is accepted as genuine.

Affected software

CVE-2023-39969 is recorded against 1 package.

  • uthenticode (fixed in 1.0.9)

Timeline and source

Published on 9 August 2023 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
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github.com
github.com
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Details

Severity CRITICAL
CVSS Score 9.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE CWE-347
Public Exploit ✅ No
Source NVD
Published 2023-08-09
Updated 2026-08-11
Modified 2026-06-17

Affected Packages

Software From version Fixed in
uthenticode — 1.0.9

Similar Threats

Exploit Protection

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