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CVE-2025-3887

GStreamer H265 Codec Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

HIGH
8.8
CVSS Score
Published: May 22, 2025 at 12:47 AM UTC
Updated: June 17, 2026 at 09:20 AM UTC
3 products affected across 3 vendorsDebian LinuxGstreamerGStreamer

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Severity
HIGH8.8
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

Description

GStreamer H265 Codec Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability. 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 specific flaw exists within the parsing of H265 slice headers. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-26596.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
11.0
Gstreamer· Gstreamer Project
95%
1.0.0 ≤ v < 1.26.1
Affected range stops below 1.26.1, so it looks safe — our inference, not a vendor statement
GStreamer· Gstreamer
60%
2e8b542145c1b11f8b8d927f6c679fd8028ceb60

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_research-advisoryThird Party Advisory
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-25-267/
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/06/msg00017.html

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHzdi
Vector?

Quick Info

StatusANALYZED
CWE
CWE-121CWE-787

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