Read the docs
TI-2026-20920 Aliases CVE-2026-25880

Untrusted Search Path in SumatraPDF Reader (explorer.exe on Windows)

Priority LOW 35CWE-426Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-426.

Summary

SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, the PDF reader allows execution of a malicious binary (explorer.exe) located in the same directory as the opened PDF when the user clicks File → “Show in folder”. This behavior leads to arbitrary code execution on the victim’s system with the privileges of the current user, without any warning or user interaction beyond the menu click.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00229 13th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
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
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
sumatrapdfreadersumatrapdfup to 3.5.2—No fix listedCNA
  • sumatrapdf Vendorsumatrapdfreader Affected up to 3.5.2 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:sumatrapdfreader:sumatrapdf:*:*:*:*:*:*:*:*up to 3.5.2Vulnerablesumatrapdfreader
  • cpe:2.3:a:sumatrapdfreader:sumatrapdf:*:*:*:*:*:*:*:* Versions up to 3.5.2 Vulnerable ·sumatrapdfreader

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25880

References

Exploit 1

  • TI-2026-18936 SumatraPDF has an Untrusted Search Path in sumatrapdf/src/AppTools.cpp CVSS 3.1HIGH 8.6
  • TI-2025-35489 A null pointer dereference vulnerability was discovered in SumatraPDF 3.5.2 during the… CVSS 3.1HIGH 7.3
  • TI-2012-04514 SumatraPDF 2.1.1/MuPDF 1.0 allows remote attackers to cause an Integer Overflow in the… CVSS 3.1HIGH 7.8
  • TI-2026-19293 SumatraPDF's Integer Underflow in PalmDbReader Leads to Crash CVSS 3.1MEDIUM 5.5
  • TI-2023-16705 A buffer overflow in SumatraPDF Reader v3.4.6 allows attackers to cause a Denial of… CVSS 3.1MEDIUM 5.5
  • TI-2009-01521 Heap-based buffer overflow in the loadexponentialfunc function in mupdf/pdf_function.c in… CVSS 3.1MEDIUM 5.4
See all 12 →

Sources

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