CVE-2026-107734 SumatraPDF - Command Injection

SumatraPDF <= 3.5.2 contains a command injection caused by unsafe substitution of attacker-controlled SyncTeX source filename in external editor command line, letting attackers inject command-line flags via crafted .synctex.gz files, exploit requires user to open PDF and invoke inverse search with configured external editor.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Command Injection
Impact
Remote Code Execution
CVSS vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Update to the latest version once a fix is available.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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