Security readout for executives and security teams
Plain-English summary
CVE-2026-3081 is a high-severity memory corruption flaw in GStreamer’s H.266 codec parser. A crafted media input could cause code execution inside the application using GStreamer. Business risk depends on where GStreamer processes untrusted media, such as uploaded files, streams, or user-opened content.
Executive priority
Treat this as a high-priority patching and exposure review item, especially for media-processing services. It is not marked KEV in the provided bundle, but potential code execution in user-facing parsing workflows warrants timely remediation.
Technical view
The flaw is a stack-based buffer overflow while parsing H.266 decoding units. User-supplied length is not properly validated before data is copied into a fixed-size stack buffer, enabling possible arbitrary code execution in the current process. The CVSS 3.0 vector is 7.8, with user interaction required.
Likely exposure
Most likely exposed systems are applications, services, or desktop workflows that use affected GStreamer code to parse H.266 media from untrusted sources. The bundle does not confirm affected package versions beyond a referenced GStreamer commit/hash and vendor references.
Exploitation context
ZDI describes remote attackers executing code on affected GStreamer installations, but interaction with the library is required and attack vectors vary by implementation. The bundle says KEV is false, so there is no provided evidence of known active exploitation.
Researcher notes
Evidence supports a parser length-validation bug leading to stack overflow and possible RCE. Public details in the bundle do not establish broad product version ranges, exploit availability, or active exploitation. Validate impact through upstream commit analysis and distribution advisories.
Mitigation direction
- Check GStreamer and operating-system vendor advisories for fixed releases containing the referenced commit.
- Prioritize updates where GStreamer processes untrusted uploads, streams, attachments, or user-downloaded media.
- Limit or disable H.266 parsing in high-risk paths until vendor-fixed packages are deployed.
- Run media-processing workloads with least privilege and isolation where operationally feasible.
- Track Red Hat and distribution advisories for package-specific impact and remediation status.
Validation and detection
- Inventory applications and services that link to or package GStreamer.
- Identify whether those systems parse H.266 or VVC media from untrusted sources.
- Compare installed GStreamer builds against vendor fixed versions or the referenced upstream commit.
- Review media-processing logs and crash reports for suspicious H.266 parser failures.
- Confirm distribution-specific status using Red Hat or relevant vendor CVE pages.
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-120: 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 lookupCWE-121: 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-2026-3081 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
- 2026-03-13T21:01:58.631Z: Reported to Red Hat.
- 2026-03-13T20:39:20.596Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- ZDI-26-162CVE reference, zdi · x_research-advisory
- vendor-provided URLCVE reference, zdi · vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-3081CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2447494CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3081.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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.