CVE-2026-103087 Denial of service in gosub-engine
Remote attackers can crash the Gosub browser engine via deeply nested SVG elements, causing stack exhaustion and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-103087?
CVE-2026-103087 is a high-severity denial of service vulnerability in gosub-io gosub-engine, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Uncontrolled recursion in the Gosub browser engine (gosub-engine) through 0.1.0 and main before commit 46868b3 allows a remote attacker to cause a Denial of Service (stack exhaustion and application crash) via an SVG document containing an excessive number of deeply nested elements. Because the engine does not limit the nesting depth of processed SVG nodes, rendering such a document overflows the thread stack and terminates the application. The malicious SVG can be embedded through the SRC attribute of an IMG element, and thus exploitation only requires the victim to visit an attacker-controlled web page.
Weakness: CWE-674
Which versions are affected by CVE-2026-103087?
How do I fix CVE-2026-103087?
No fix has been published for CVE-2026-103087 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-103087 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103087 exists.
Sources
Also known as GHSA-c762-mxfh-vwvp, GHSA-pj55-j4f4-8jj5.