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CVE-2026-24850— ML-DSA Signature Verification Accepts Signatures with Repeated Hint Indices

Quick assessment

Affected
RustCrypto signatures
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RustCrypto signatures是RustCrypto开源的一个数字签名算法集合。 RustCrypto signatures 0.0.4版本至0.1.0-rc.4之前版本存在数据伪造问题漏洞，该漏洞源于签名验证实现错误地接受重复提示索引，可能导致签名验证绕过。

CVSS 5.3 · Medium EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1554 · Compromise Host Software Binary
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I. Basic Information for CVE-2026-24850

Vulnerability Information
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Vulnerability Title
ML-DSA Signature Verification Accepts Signatures with Repeated Hint Indices
Source: CVE Program / CVE List V5
Vulnerability Description
The ML-DSA crate is a Rust implementation of the Module-Lattice-Based Digital Signature Standard (ML-DSA). Starting in version 0.0.4 and prior to version 0.1.0-rc.4, the ML-DSA signature verification implementation in the RustCrypto `ml-dsa` crate incorrectly accepts signatures with repeated (duplicate) hint indices. According to the ML-DSA specification (FIPS 204 / RFC 9881), hint indices within each polynomial must be **strictly increasing**. The current implementation uses a non-strict monotonic check (`<=` instead of `<`), allowing duplicate indices. This is a regression bug. The original implementation was correct, but a commit in version 0.0.4 inadvertently changed the strict `<` comparison to `<=`, introducing the vulnerability. Version 0.1.0-rc.4 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
RustCrypto signatures 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RustCrypto signatures是RustCrypto开源的一个数字签名算法集合。 RustCrypto signatures 0.0.4版本至0.1.0-rc.4之前版本存在数据伪造问题漏洞，该漏洞源于签名验证实现错误地接受重复提示索引，可能导致签名验证绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
RustCrypto signatures >= 0.0.4, < 0.1.0-rc.4 -

II. Public POCs for CVE-2026-24850

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III. Intelligence Information for CVE-2026-24850

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Patches & Fixes for CVE-2026-24850 (1)

Vendor Advisories for CVE-2026-24850 (1)

Other References for CVE-2026-24850 (4)

IV. Related Vulnerabilities

Same product: signatures
Same vendor: RustCrypto
Same weakness: CWE-347

V. Comments for CVE-2026-24850

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