CVE-2026-59976Public exploitNetwork attack vectorHinoki check available

Arbitrary file overwrite via conversion output path traversal

Published Oct 12, 2026 · Updated Oct 12, 2026

Path traversal in C4illin ConvertX before 0.18.0 allows attackers to overwrite container files through ImageMagick conversion requests. The /convert endpoint accepts traversal sequences in convert_to and incorporates them into the output path for an extensionless image without restricting the destination directory. Exploitation requires authenticated access unless unauthenticated access is enabled; written content is conversion output, and overwriting critical files causes application or system crashes.

CVSS severity8.1
High
EPSS probability0.65%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Path traversal in C4illin ConvertX before 0.18.0 allows attackers to overwrite container files through ImageMagick conversion requests. The /convert endpoint accepts traversal sequences in convert_to and incorporates them into the output path for an extensionless image without restricting the destination directory. Exploitation requires authenticated access unless unauthenticated access is enabled; written content is conversion output, and overwriting critical files causes application or system crashes.

The record

CVE
CVE-2026-59976
Published
Oct 12, 2026
Updated
Oct 12, 2026
Vendor
C4illin
Product
ConvertX
Classifications
CWE-73, CWE-22, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 12, 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=< 0.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

C4illin · ConvertXversion=< 0.18.0

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-73External Control of File Name or Path
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1565.001Stored Data Manipulation

Public exploit references

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Technologies

Your stack

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Your stack

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