Quick answers
- Is CVE-2026-107732 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-107732 being exploited in the wild.
- How severe is CVE-2026-107732?
- Informational severity, published 8 October 2026.
- Which products and versions are affected?
- SumatraPDF 3.6.1 and earlier.
- Is there a fix for CVE-2026-107732?
- No fixed version is recorded yet. Avoid opening untrusted PDF documents or documents from untrusted sources with filenames containing markup patterns or special characters. Exercise caution when clicking links in notification messages. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-107732 attacked?
- It is attacked with local access, in a software library.
- Am I affected by CVE-2026-107732?
- Check whether you run SumatraPDF at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
Avoid opening untrusted PDF documents or documents from untrusted sources with filenames containing markup patterns or special characters. Exercise caution when clicking links in notification messages.
Technical details
The vulnerability stems from untrusted text (file paths, PDF link targets) being interpolated into notification messages and then parsed as tip markup by ParseTip(). If the text contains a link pattern [text](CmdExec <exe>), ExecuteTipLink() dispatches it as a command link via CmdExec. The attack requires user interaction: the victim must click the injected link in a notification triggered by opening a crafted document.
Affected products
- SumatraPDF SumatraPDF 3.6.1 and earlier
Timeline
- 2026-08-12: disclosed
- 2026-10-08: advisory