CVE-2026-107736 SumatraPDF: stack buffer overflow while processing EXIF Orientation metadata
Attackers can cause a denial of service in SumatraPDF by opening a crafted TIFF file that triggers a stack buffer overflow during EXIF metadata processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-107736?
CVE-2026-107736 is a medium-severity memory corruption vulnerability in sumatrapdfreader sumatrapdf, published on 8 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, MaybeFlipBitmap() asks GDI+ to read the attacker-controlled PropertyTagOrientation size through GetPropertyItem() while supplying only a fixed 64-byte buf on the stack. Opening a crafted TIFF with enough EXIF Orientation values can cause attacker-selected bytes to overwrite stack control data, while tested builds terminate through the stack cookie check. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.
Weakness: CWE-121
Which versions are affected by CVE-2026-107736?
How do I fix CVE-2026-107736?
No fix has been published for CVE-2026-107736 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-107736 being exploited?
There is no known exploitation of CVE-2026-107736 in the wild and no public exploit code.
Sources
Also known as GHSA-px68-7vwv-mxpr.