CVE-2025-43294

Local sensitive-data disclosure via insufficient environment validation

Published Sep 15, 2025 · Updated Sep 15, 2025

Improper access control in MallocStackLogging in Apple macOS before 26 allows local users to read sensitive user data via an app. MallocStackLogging processes environment variables without sufficient validation, but Apple has not disclosed the affected variables, processing path, or data exposed. Exploitation requires a local low-privileged context and discloses data only; no integrity or availability impact is reported.

CVSS severity3.3
Low
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in MallocStackLogging in Apple macOS before 26 allows local users to read sensitive user data via an app. MallocStackLogging processes environment variables without sufficient validation, but Apple has not disclosed the affected variables, processing path, or data exposed. Exploitation requires a local low-privileged context and discloses data only; no integrity or availability impact is reported.

The record

CVE
CVE-2025-43294
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
Apple
Product
macOS
Classifications
CWE-284, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <26

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Apple · macOSversion=unspecified <26

Published CVSS scores

3.3CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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