Vulnerability · Published Aug 19, 2026 · Assigned by certcc
CVE-2026-19508RDK WebUI heap-based buffer overflow vulnerability
Critical 9.8
In plain English
A critical-severity memory corruption in RDK-B WebUI from RDK. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.0%top 37.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| RDK | RDK-B WebUI | rdkb-2025q4-kirkstone |
Weakness: CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H