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TI-2023-20635 Aliases CVE-2023-39503GHSA-6xrg-qxjf-3xgp

Out-of-bounds read in PDF-XChange Editor

Priority LOW 25CWE-125Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

PDF-XChange Editor OXPS File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of PDF-XChange Editor. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of OXPS files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process. Was ZDI-CAN-20036.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00369 31st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
PDF-XChangePDF-XChange Editor9.5.366.0—No fix listedCNA
  • PDF-XChange Editor VendorPDF-XChange Affected 9.5.366.0 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:pdf-xchange:pdf-tools:9.5.366.0:*:*:*:*:*:*:*9.5.366.0VulnerablePDF-XChange
cpe:2.3:a:pdf-xchange:pdf-xchange_editor:9.5.366.0:*:*:*:*:*:*:*9.5.366.0VulnerablePDF-XChange
  • cpe:2.3:a:pdf-xchange:pdf-tools:9.5.366.0:*:*:*:*:*:*:* Versions 9.5.366.0 Vulnerable ·PDF-XChange
  • cpe:2.3:a:pdf-xchange:pdf-xchange_editor:9.5.366.0:*:*:*:*:*:*:* Versions 9.5.366.0 Vulnerable ·PDF-XChange

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-39503
  2. 2026-10-03 Alias added: GHSA-6xrg-qxjf-3xgp

References

Advisory 1

  • TI-2023-22476 Use after free in PDF-XChange Editor CVSS 3.1HIGH 7.8
  • TI-2023-22454 Use after free in PDF-XChange Editor CVSS 3.1HIGH 7.8
  • TI-2023-22453 Heap-based buffer overflow in PDF-XChange Editor CVSS 3.1HIGH 7.8
  • TI-2023-22451 Heap-based buffer overflow in PDF-XChange Editor CVSS 3.1HIGH 7.8
  • TI-2023-22445 Heap-based buffer overflow in PDF-XChange Editor CVSS 3.1HIGH 7.8
  • TI-2023-22444 Heap-based buffer overflow in PDF-XChange Editor CVSS 3.1HIGH 7.8
See all 171 →

Sources

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