How severe is CVE-2026-35203?

CVE-2026-35203 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-35203 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35203?

CVE-2026-35203 affects Zlmediakit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35203?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-35203 have an EU (EUVD) identifier?

Yes. CVE-2026-35203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19475.

When was CVE-2026-35203 published?

CVE-2026-35203 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-35203

CVE-2026-35203 is a high-severity vulnerability in Zlmediakit with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19475
Weakness: CWE-125
Affected product: Zlmediakit
Published: 2026-04-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-35203?: 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.
How severe is CVE-2026-35203?: CVE-2026-35203 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-35203 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35203?: CVE-2026-35203 affects Zlmediakit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35203?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-35203 have an EU (EUVD) identifier?: Yes. CVE-2026-35203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19475.
When was CVE-2026-35203 published?: CVE-2026-35203 was published on 2026-04-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:zlmediakit:zlmediakit:*:*:*:*:*:*:*:*

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