CVE-2026-35203: ZLMediaKit is a streaming media service framework

Q: How do I fix CVE-2026-35203?

zlmediakit: upgrade to 2026-03-29. Exact commands for each OS are on this page.

Q: Is CVE-2026-35203 being exploited?

CVE-2026-35203 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35203 affect?

CVE-2026-35203 affects zlmediakit. Severity is high (CVSS 7.5). 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 buff

Q: How urgent is CVE-2026-35203?

Priority 43/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-35203 is a high-severity flaw (CVSS 7.5) affecting zlmediakit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 com

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-04-06
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: zlmediakit

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-06 20:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

zlmediakit zlmediakit UPGRADE

Affected: < 2026-03-29

Fixed in: 2026-03-29

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy zlmediakit || rpm -q zlmediakit || zlmediakit --version

2. UPGRADE to 2026-03-29 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zlmediakit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zlmediakit

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35203?

zlmediakit: upgrade to 2026-03-29. Exact commands for each OS are on this page.

Is CVE-2026-35203 being exploited?

CVE-2026-35203 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35203 affect?

CVE-2026-35203 affects zlmediakit. Severity is high (CVSS 7.5). 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 buff

How urgent is CVE-2026-35203?

Priority 43/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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