Security readout for executives and security teams
Plain-English summary
CVE-2026-3086 is a memory corruption flaw in GStreamer’s H.266 parser. If an application processes a malicious media stream or file through the affected parser, code may run with that application’s permissions. The public record does not show confirmed active exploitation.
Executive priority
Treat as a high-priority media-processing risk. It can lead to code execution where untrusted media reaches GStreamer, but current evidence does not support emergency KEV-level handling.
Technical view
The flaw is an out-of-bounds write during APS unit processing in the GStreamer H.266 codec parser, caused by insufficient validation of user-supplied data. ZDI reports possible arbitrary code execution in the current process context. CVSS is 7.8 with user interaction required and high confidentiality, integrity, and availability impact.
Likely exposure
Systems are most exposed where GStreamer parses untrusted H.266/VVC media, including desktop media players, transcoding services, preview generators, and applications embedding GStreamer. The provided affected version data is incomplete, so inventory should focus on GStreamer use and vendor package status.
Exploitation context
Sources describe remote attacker-controlled input, but exploitation requires the target application or user to process malicious media. KEV is false in the bundle, and no cited source confirms exploitation in the wild.
Researcher notes
Evidence identifies CWE-787 in APS unit parsing and references ZDI-CAN-28911 plus a vendor commit. Public affected-version detail is sparse; avoid broad product claims beyond GStreamer and downstream packages until vendors publish mapping.
Mitigation direction
- Apply vendor or distribution updates that include the GStreamer fix commit.
- Restrict processing of untrusted H.266/VVC media until patched.
- Run media parsing workloads with least privilege and isolation where practical.
- Monitor Red Hat and GStreamer advisories for affected package status.
- Prioritize applications that automatically preview, transcode, or ingest uploaded media.
Validation and detection
- Inventory systems and applications using GStreamer or GStreamer plugins.
- Check installed package versions against vendor and distribution advisories.
- Confirm whether H.266/VVC parsing is enabled or reachable from untrusted input.
- Verify patched builds include the referenced GStreamer commit.
- Review media ingestion paths for automatic parsing of uploaded or external files.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-3086 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9zdiCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base CVSS 3.0 score
7.8HighVector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-03-13T21:01:55.526Z: Reported to Red Hat.
- 2026-03-13T20:40:12.973Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- ZDI-26-170CVE reference, zdi · x_research-advisory
- vendor-provided URLCVE reference, zdi · vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-3086CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2447493CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3086.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.