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Medium

SumatraPDF: Null-pointer dereference in `CmdExec` when no document tab is open

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-107733

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-107733

sumatrapdf

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "sumatrapdfreader",
    "product": "sumatrapdf",
    "versions": [
      {
        "status": "affected",
        "version": "<= 3.6.1"
      }
    ]
  }
]
Related CVEs
CVE-2026-107733

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#21343 · Revision 1
Added to Heist Feed
Publisher date
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