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TI-2026-71238 Aliases CVE-2026-59976

Path traversal in ConvertX lets attackers write arbitrary files

Priority HIGH 70CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

ConvertX before 0.18.0 is affected. Its ImageMagick converter builds an output path from the unsanitized convert_to parameter, a path traversal flaw (CWE-22). An authenticated user, or an unauthenticated user when unauthenticated access is enabled, can supply traversal sequences in that parameter to write converted output to arbitrary container paths. This can overwrite files or cause denial of service.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

ConvertX is a self-hosted file conversion service. Prior to 0.18.0, the ImageMagick converter uses the unsanitized convert_to parameter to construct an output path. If an authenticated user, or an unauthenticated user when ConvertX is configured to allow unauthenticated access, uploads an extensionless image and supplies directory traversal sequences in convert_to through /convert, the constructed path escapes the intended output directory, allowing the attacker to write converted output to arbitrary container paths, potentially overwriting files or causing denial of service. This issue is fixed in version 0.18.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00769 55th percentileScored 2026-11-07
Fix Fixed ConvertX (C4illin): 0.18.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
C4illinConvertXbefore 0.18.00.18.0Patch availableCNA
  • ConvertX VendorC4illin Affected before 0.18.0 Fixed in 0.18.0 Patch available CNA

Remediation

ConvertX 0.18.0 fixes this issue, so users should upgrade to version 0.18.0 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA ConvertX (C4illin) Fixed in 0.18.0

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-59976
  2. 2026-10-13 Priority changed: MEDIUM → LOW
  3. 2026-10-13 CISA SSVC decision points changed
  4. 2026-10-13 Priority changed: LOW → HIGH
  5. 2026-10-19 EPSS moved to the 50th–90th percentile

References

Other 4

  • TI-2025-40881 ConvertX has Path Traversal that leads to Arbitrary File Write and Arbitrary Code Execution CVSS 3.1HIGH 8.8
  • TI-2026-19946 ConvertX Vulnerable to Arbitrary File Deletion via Path Traversal in `POST /delete` CVSS 3.1HIGH 8.1
  • TI-2026-67393 In ConvertX before 0.19.0, converters/calibre.ts does not block recipe files, and instead… CVSS 4.0CRITICAL 9.4
  • TI-2026-71239 Cross-site request forgery in ConvertX deletes conversion history CVSS 3.1HIGH 8.1
  • TI-2026-58743 ConvertX 0.17.0 Arbitrary File Read via LaTeX Input Directives CVSS 4.0HIGH 7.1
  • TI-2026-70674 Arbitrary file read in ConvertX via Pandoc converter CVSS 4.0HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences