CVE-2026-107734

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/sumatrapdfreader/sumatrapdf/commit/398d23624362c60722d9709173a287ea53545b3b
https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-jf4v-rw66-j4w2
https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-jf4v-rw66-j4w2

Configurations

No configuration.

History

09 Oct 2026, 16:17

Type	Values Removed	Values Added
References	~~() https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-jf4v-rw66-j4w2 -~~	() https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-jf4v-rw66-j4w2 -

08 Oct 2026, 23:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-08 23:16

Updated : 2026-10-09 16:17

NVD link : CVE-2026-107734

Mitre link : CVE-2026-107734

CVE.ORG link : CVE-2026-107734

JSON object : View

Products Affected

No product.

CWE

CWE-20

Improper Input Validation

CWE-88

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

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