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CVE-2026-50185— RustCrypto Cmov/CmovEq on aarch64 can produce wrong results if high-bits of registers are set

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 cmov是RustCrypto团队开源的一个Rust密码学库组件。 RustCrypto cmov 0.1.1版本至0.5.4之前版本存在处理逻辑错误漏洞，该漏洞源于aarch64架构中Cmov和CmovEq实现假设高位在加载小于寄存器大小的值时被零扩展，导致设置高比特位时可能产生错误输出。

AI Predicted 5.9 Difficulty: Easy EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
RustCrypto utils >= 0.1.1, < 0.5.4 affected
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I. Basic Information for CVE-2026-50185

Vulnerability Information
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Vulnerability Title
RustCrypto Cmov/CmovEq on aarch64 can produce wrong results if high-bits of registers are set
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. From 0.1.1 until 0.5.4, the aarch64 implementations of Cmov and CmovEq in cmov/src/backends/aarch64.rs assume high bits are zero-extended when loading values smaller than a register, so set high bits such as [8..] in a Cmov selector or [16..] of self or other in the u16 and i16 CmovEq implementations can cause left.cmovz(&right, condition) to produce incorrect output. This issue is fixed in version 0.5.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
依赖未定义、未指明或实现定义的行为
Source: CVE Program / CVE List V5
Vulnerability Title
RustCrypto cmov 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RustCrypto cmov是RustCrypto团队开源的一个Rust密码学库组件。 RustCrypto cmov 0.1.1版本至0.5.4之前版本存在处理逻辑错误漏洞，该漏洞源于aarch64架构中Cmov和CmovEq实现假设高位在加载小于寄存器大小的值时被零扩展，导致设置高比特位时可能产生错误输出。
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 >= 0.1.1, < 0.5.4 -

II. Public POCs for CVE-2026-50185

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III. Intelligence Information for CVE-2026-50185

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Patches & Fixes for CVE-2026-50185 (1)

Vendor Advisories for CVE-2026-50185 (1)

Vendor Pages for CVE-2026-50185 (1)

IV. Related Vulnerabilities

Same product: utils
Same vendor: RustCrypto
Same weakness: CWE-758

V. Comments for CVE-2026-50185

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