CVE-2026-76845

Local file overwrite via extraction symlink following

Published Aug 24, 2026 · Updated Aug 24, 2026

Link following in cthackers adm-zip 0.5.9 through 0.6.0 allows local users to overwrite files outside an extraction root. Utils.writeFileTo opens a sanitized destination with fs.openSync in write mode without rejecting a preexisting symbolic link, so extraction follows the link. Exploitation requires overwrite mode and control of a link inside a shared, reused, or predictable destination; the write is limited by the extracting process's file permissions.

CVSS severity6.8
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Link following in cthackers adm-zip 0.5.9 through 0.6.0 allows local users to overwrite files outside an extraction root. Utils.writeFileTo opens a sanitized destination with fs.openSync in write mode without rejecting a preexisting symbolic link, so extraction follows the link. Exploitation requires overwrite mode and control of a link inside a shared, reused, or predictable destination; the write is limited by the extracting process's file permissions.

The record

CVE
CVE-2026-76845
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
cthackers
Product
adm-zip
Classifications
CWE-59, CAPEC-132, T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 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=0.5.9 <=0.6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

cthackers · adm-zipversion=0.5.9 <=0.6.0

Published CVSS scores

6.5VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
CAPEC-132Symlink Attack
T1565.001Stored Data Manipulation

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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