EUVD-2026-19475
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3Description
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.
Analysis
Heap-buffer-overflow in ZLMediaKit's VP9 RTP payload parser allows unauthenticated remote attackers to trigger denial of service by sending a maliciously crafted 1-byte VP9 RTP packet with all flag bits set (0xFF). The vulnerability affects the ext-codec/VP9Rtp.cpp parser which reads multiple fields based on flag bits without validating sufficient buffer data exists, causing out-of-bounds memory reads. …
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Remediation
Within 24 hours: Identify all ZLMediaKit deployments in your environment and assess exposure to untrusted RTP sources; document current versions and network segmentation. Within 7 days: Implement network-level filtering to restrict RTP traffic to trusted sources only, or isolate affected ZLMediaKit instances from production streaming paths if feasible. …
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External POC / Exploit Code
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