CVE-2024-27876Public exploit

Arbitrary file write via archive extraction race

Published Sep 16, 2024 · Updated Apr 2, 2026

Arbitrary file write in Apple Compression on affected iOS, iPadOS, macOS, and visionOS releases allows attackers to abuse archive extraction. In libAppleArchive's concatExtractPath(), concurrent extraction creates a symlink after lstat64 but before mkdir, whose failure is ignored before the file write. A user must unpack the crafted archive; the write follows the symlink to a path reachable within the extracting process's sandbox.

CVSS severity5.5
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in Apple Compression on affected iOS, iPadOS, macOS, and visionOS releases allows attackers to abuse archive extraction. In libAppleArchive's concatExtractPath(), concurrent extraction creates a symlink after lstat64 but before mkdir, whose failure is ignored before the file write. A user must unpack the crafted archive; the write follows the symlink to a path reachable within the extracting process's sandbox.

The record

CVE
CVE-2024-27876
Published
Sep 16, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
iOS
Classifications
CWE-362, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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?

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

  1. Affected versionversion=0 <17.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=0 <17.7
Apple · iOS and iPadOSversion=0 <17.7; version=0 <18
Apple · visionOSversion=0 <2
Apple · macOSversion=0 <13.7; version=0 <14.7; version=0 <15; version=14 <14.7
Apple · iPadOSversion=0 <17.7

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
8.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1204.002Malicious File

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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