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TI-2026-69814 Aliases CVE-2026-107734

SumatraPDF: SyncTeX Argument Injection in Inverse Search Enables Arbitrary Command Execution via External Editors

Priority HIGH 66CWE-20Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-88.

Summary

SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, an attacker-controlled SyncTeX source filename is substituted for the %f placeholder in an external editor command line without safe Windows argument quoting, and the resulting command line is passed to CreateProcessW(). A user with an external editor configured or auto-detected who opens a PDF with a crafted .synctex.gz file and invokes inverse search can inject command-line flags; the resulting impact depends on the target editor interpreting those flags and can include unintended editor actions or code execution through a malicious extension. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.002 9th 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
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
sumatrapdfreadersumatrapdfup to 3.5.2—No fix listedCNA
  • sumatrapdf Vendorsumatrapdfreader Affected up to 3.5.2 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:sumatrapdfreader:sumatrapdf:*:*:*:*:*:*:*:*——sumatrapdfreader
  • cpe:2.3:a:sumatrapdfreader:sumatrapdf:*:*:*:*:*:*:*:* Versions — — ·sumatrapdfreader

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-09 Threatist record created from CVE-2026-107734
  2. 2026-10-10 CISA SSVC decision points changed
  3. 2026-10-10 Priority changed: MEDIUM → HIGH

References

Other 2

  • 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-2026-69819 Argument injection in SumatraPDF selection translation on Windows CVSS 4.0HIGH 7.1
  • TI-2026-69813 Null pointer dereference in SumatraPDF CmdExec crashes the reader CVSS 4.0MEDIUM 6.8
  • TI-2026-21058 SumatraPDF: Heap out-of-bounds read in MOBI header parser. CVSS 4.0MEDIUM 6.8
See all 26 →

Sources

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