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CVE-2026-23519— RustCrypto cmov: thumbv6m-none-eabi compiler emits non-constant time assembly when using cmovnz

Quick assessment

Affected
RustCrypto utils
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是RustCrypto开源的一个带关联数据算法的身份验证加密。 RustCrypto 0.4.4之前版本存在安全漏洞，该漏洞源于编译器生成非恒定时间汇编代码。

AI Predicted 5.3 Difficulty: Easy EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-23519

Vulnerability Information
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Vulnerability Title
RustCrypto cmov: thumbv6m-none-eabi compiler emits non-constant time assembly when using cmovnz
Source: CVE Program / CVE List V5
Vulnerability Description
RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewritten as branches by the compiler. Prior to 0.4.4, the thumbv6m-none-eabi (Cortex M0, M0+ and M1) compiler emits non-constant time assembly when using cmovnz (portable version). This vulnerability is fixed in 0.4.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
RustCrypto 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RustCrypto是RustCrypto开源的一个带关联数据算法的身份验证加密。 RustCrypto 0.4.4之前版本存在安全漏洞，该漏洞源于编译器生成非恒定时间汇编代码。
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 utils < 0.4.4 -

II. Public POCs for CVE-2026-23519

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III. Intelligence Information for CVE-2026-23519

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Patches & Fixes for CVE-2026-23519 (1)

IV. Related Vulnerabilities

Same product: utils
Same vendor: RustCrypto
Same weakness: CWE-208

V. Comments for CVE-2026-23519

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