CVE-2026-50185Public exploit

Incorrect conditional selection via unmasked register bits

Published Jul 17, 2026 · Updated Jul 17, 2026

Incorrect computation in RustCrypto cmov 0.1.1 through 0.5.3 allows attackers to obtain wrong Cmov or CmovEq results on AArch64 via narrowed inputs. The inline assembly in cmov/src/backends/aarch64.rs compares full registers without masking undefined upper bits of narrow inputs. Manifestation requires calling code to pass a narrowed value whose original high bits remain set; the conditional select can then preserve or move the wrong operand.

CVSS severity2.0
Low
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect computation in RustCrypto cmov 0.1.1 through 0.5.3 allows attackers to obtain wrong Cmov or CmovEq results on AArch64 via narrowed inputs. The inline assembly in cmov/src/backends/aarch64.rs compares full registers without masking undefined upper bits of narrow inputs. Manifestation requires calling code to pass a narrowed value whose original high bits remain set; the conditional select can then preserve or move the wrong operand.

The record

CVE
CVE-2026-50185
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-758
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.0GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-758Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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