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TI-2026-69813 Aliases CVE-2026-107733

Null pointer dereference in SumatraPDF CmdExec crashes the reader

Priority MEDIUM 63CWE-476Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-476.

Summary

SumatraPDF 3.6.1 and earlier is a multi-format reader for Windows. Its CmdExec handling passes a null current-tab pointer to RunWithExe, which dereferences it (CWE-476). A local process in the same interactive Windows session, at an integrity level at least equal to SumatraPDF's, can send CmdExec over DDE or WM_COPYDATA while no document tab is open, which abruptly terminates the process and loses unsaved state.

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

Description from the CNA

SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, FrameOnCommand() handles CmdExec by passing a null current-tab pointer to RunWithExe(), which dereferences WindowTab::filePath. A local process in the same interactive Windows session, at an integrity level greater than or equal to SumatraPDF's under Windows UIPI, can dispatch CmdExec over DDE or WM_COPYDATA while no document tab is open, causing abrupt process termination and loss of unsaved state. 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 0.00156 4th 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
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
sumatrapdfreadersumatrapdfup to 3.6.1—No fix listedCNA
  • sumatrapdf Vendorsumatrapdfreader Affected up to 3.6.1 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

The sources list no fixed version for SumatraPDF.

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

Timeline

  1. 2026-10-09 Threatist record created from CVE-2026-107733
  2. 2026-10-10 Priority changed: MEDIUM → LOW
  3. 2026-10-14 CISA SSVC decision points changed
  4. 2026-10-14 Priority changed: LOW → MEDIUM

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-2026-69814 SumatraPDF: SyncTeX Argument Injection in Inverse Search Enables Arbitrary Command Execution via External Editors CVSS 4.0HIGH 7.1
  • 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