CVE-2026-10268 janet-lang janet marsh.c unmarshal_one_fiber integer overflow
A local attacker can trigger an integer overflow in the Janet language runtime's marshalling function, potentially causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-10268?
CVE-2026-10268 is a medium-severity vulnerability in janet-lang janet, published on 1 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A weakness has been identified in janet-lang janet up to 1.41.0. This vulnerability affects the function unmarshal_one_fiber of the file src/core/marsh.c. Executing a manipulation can lead to integer overflow. It is possible to launch the attack on the local host. The exploit has been made available to the public and could be used for attacks. This patch is called d9b1d711ea1fde52ac73a82088b512a3e17bad0d. A patch should be applied to remediate this issue.
Which versions are affected by CVE-2026-10268?
How do I fix CVE-2026-10268?
No fix has been published for CVE-2026-10268 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-10268 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10268 exists.
Sources
Also known as GHSA-gqw4-cq8m-g989.