What’s Vulnerable › Vulnerabilities

CVE-2026-35203: ZLMediaKit VP9 RTP Parser Out-of-Bounds Read

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-06 · updated 2026-07-24
• Weakness: CWE-125

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.

Affected products

• ZLMediaKit: before 2026-03-29 — fixed in 2026-03-29

How to fix

Upgrade to a fixed version: ZLMediaKit 2026-03-29. Check the vendor advisory for mitigations.

References

• https://github.com/ZLMediaKit/ZLMediaKit/commit/435dcbcbbf700fd63b2ca9eac6cef3b5ea75169d
• https://github.com/ZLMediaKit/ZLMediaKit/security/advisories/GHSA-gxr3-fwc7-q99h

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