CVE-2026-19508 RDK WebUI heap-based buffer overflow vulnerability
Remote unauthenticated attackers can trigger heap-based buffer overflow in RDK-B WebUI via crafted requests, leading to denial of service or arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19508?
CVE-2026-19508 is a critical memory corruption vulnerability in RDK-B WebUI, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Heap-based buffer overflow in the multipart form-data parser in `jst_post.c` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows a remote unauthenticated attacker to cause memory corruption and denial of service, and potentially execute arbitrary code, via a crafted multipart/form-data request.
Weakness: CWE-119
Which versions are affected by CVE-2026-19508?
How do I fix CVE-2026-19508?
No fix has been published for CVE-2026-19508 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-2026-19508 being exploited?
There is no known exploitation of CVE-2026-19508 in the wild and no public exploit code.
Sources
Also known as GHSA-p7m5-wh78-3h6h.