CVE-2026-3084VulnerabilityPublished 6 Mar 2026

ZDI-26-169: GStreamer H.266 Codec Parser Integer Underflow Remote Code Execution Vulnerability

Source Zero Day Initiative

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Not known to be exploited.

Data as of 30 Oct 2026, 11:52 UTC

Severity

High

Rated High by Zero Day Initiative · No CVSS score from NVD or the CNA

EPSS: 0.4% chance of exploitation in 30 days – higher than 38% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

remote

What to do

AI-suggested

GStreamer has issued an official update that corrects this vulnerability. Users and administrators should apply the update from the official GStreamer repository or package maintainers to remediate the issue. No additional mitigation steps are indicated beyond applying the patch.

Description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-3084.

Impact

Successful exploitation allows remote attackers to execute arbitrary code with the privileges of the process using the vulnerable GStreamer library. This can lead to full compromise of the affected system or application. The vulnerability affects all installations of GStreamer that process H.266 codec data without the patch.

Summary

CVE-2026-3084 is an integer underflow vulnerability in the GStreamer H.266 codec parser. The vulnerability occurs due to insufficient validation of user-supplied data when parsing picture partitions, which can cause an integer underflow before memory writes. This flaw enables remote attackers to execute arbitrary code within the context of the affected process. Exploitation requires the target to process crafted media data via GStreamer. The Zero Day Initiative assigned a CVSS score of 7.8 and classified the severity as critical. GStreamer has released a patch to fix this issue.

References

zerodayinitiative.com/advisories/ZDI-26-169/ (opens in a new tab)

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