CVE-2026-35203 ZLMediaKit VP9 RTP Parser Out-of-Bounds Read
A crafted VP9 RTP packet causes a heap-buffer-overflow in ZLMediaKit, potentially leading to denial of service or 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-2026-35203?
CVE-2026-35203 is a high-severity memory corruption vulnerability in ZLMediaKit, published on 6 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ZLMediaKit is a streaming media service framework. the VP9 RTP payload parser in ext-codec/VP9Rtp.cpp reads multiple fields from the RTP payload based on flag bits in the first byte, without verifying that sufficient data exists in the buffer. A crafted VP9 RTP packet with a 1-byte payload (0xFF, all flags set) causes the parser to read past the end of the allocated buffer, resulting in a heap-buffer-overflow. This vulnerability is fixed with commit 435dcbcbbf700fd63b2ca9eac6cef3b5ea75169d.
Weakness: CWE-125
Which versions are affected by CVE-2026-35203?
It affects 1 product.
Products include Zlmediakit Zlmediakit.
How do I fix CVE-2026-35203?
No fix has been published for CVE-2026-35203 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-2026-35203 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35203 exists.
Other vulnerabilities in ZLMediaKit
Sources
Also known as GHSA-gxr3-fwc7-q99h.