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CVE-2026-107732: SumatraPDF: Markup/command-link injection into UI notification text

• Severity: high (CVSS 8.4 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-08 · updated 2026-10-13
• Weakness: CWE-94

Description

SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, untrusted document paths and PDF link targets are interpolated into notification text that ParseTip() interprets as trusted tip markup. When a user clicks an injected link, ExecuteTipLink() dispatches its CmdExec command and can execute an attacker-selected local program in the user's context. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.

Affected products

• sumatrapdfreader sumatrapdf: through 3.6.1

References

• https://github.com/sumatrapdfreader/sumatrapdf/commit/8b680387ed69e3504ef296e09d6e032f81076af8
• https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-2wv2-qm2f-vmxh

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