CVE-2026-3083: 
NixOS vulnerability analysis and mitigation

CVE-2026-3083 is an out-of-bounds write vulnerability in GStreamer's rtpqdm2depay component, enabling remote attackers to execute arbitrary code on affected systems. The flaw was reported to the vendor on February 6, 2026, and publicly disclosed on March 6, 2026, via a coordinated Zero Day Initiative advisory (ZDI-26-166). It affects all GStreamer versions prior to 1.28.1. The vulnerability carries a CVSS v3.0 base score of 8.8 (High) (ZDI Advisory, Red Hat Bugzilla).

The root cause is improper validation of array indices (CWE-129) combined with an out-of-bounds write (CWE-787) in GStreamer's X-QDM RTP payload depayloader (rtpqdm2depay). When parsing the packetid element within an X-QDM RTP payload, the process fails to validate user-supplied data, allowing a write past the end of a heap-allocated array. Exploitation requires an attacker to deliver a maliciously crafted RTP stream to an application that uses GStreamer for media processing; user interaction is required in the sense that the target application must process the malicious stream. The fix is available in the upstream GStreamer commit d60a94dee3c0a0942c9981491bf83e0de1900fbf (ZDI Advisory, GStreamer Commit).

Successful exploitation allows an unauthenticated remote attacker to execute arbitrary code in the context of the process using GStreamer, inheriting all privileges of that process. This results in high confidentiality, integrity, and availability impact — an attacker could read sensitive data, modify application state, or crash the affected process. Applications processing untrusted RTP media streams (e.g., media players, conferencing software, streaming servers) are at greatest risk, and compromise could serve as a foothold for lateral movement within a network (ZDI Advisory, Red Hat Bugzilla).

No confirmed public exploit code or proof-of-concept is available; the ZDI advisory provides only informational details without exploit steps or payloads (ZDI Advisory). There is no evidence of in-the-wild exploitation, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. The EPSS score is approximately 0.497%, indicating a low probability of exploitation in the near term (Feedly). No threat actor attribution has been reported.

Update GStreamer to version 1.28.1 or later, which contains the upstream fix (GStreamer Commit). Red Hat has issued patches across multiple RHEL versions: RHEL 10 (RHSA-2026:6259, RHSA-2026:19024), RHEL 9 (RHSA-2026:6300, RHSA-2026:19180), RHEL 8 (RHSA-2026:6750), and RHEL 7 ELS (RHSA-2026:7673, RHSA-2026:7850), among others (Red Hat Bugzilla). As a workaround where patching is not immediately possible, restrict network access to applications that process RTP streams and implement network segmentation to limit exposure of GStreamer-dependent services to untrusted sources.

The vulnerability was credited to an anonymous researcher through the Zero Day Initiative bug bounty program and received standard coverage from Linux distribution security channels including Red Hat, Ubuntu, Oracle Linux, AlmaLinux, Rocky Linux, Amazon Linux, and the Yocto Project (Red Hat Bugzilla). No notable independent researcher commentary or significant social media discussion has been identified beyond routine vulnerability tracking and patch announcements.