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CVE-2026-100229 Red Hat CVE debrief

A flaw was found in GStreamer's H.266 codec parser library (libgstcodecparsers). An out-of-bounds write vulnerability exists in the DCI parsing function, where a reserved field value is incorrectly accepted, causing the parser to write beyond the bounds of an internal structure. An attacker could exploit this by providing a specially crafted H.266 bitstream to a third-party application that uses this library API, potentially causing a crash or memory corruption. No standard GStreamer pipeline element currently invokes the affected code path.

Vendor
Red Hat
Product
Red Hat Enterprise Linux 10
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Defenders responsible for systems using GStreamer's H.266 codec parser library should assess exposure and prioritize verification of affected versions in their inventory. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure that their systems are not vulnerable to this out-of-bounds write vulnerability.

Why it matters

Defenders should prioritize verifying the presence of affected versions in their inventory and assess exposure in systems using GStreamer's H.266 codec parser library due to the potential for crashes or memory corruption.

  • Potential crashes or memory corruption in systems using the affected library
  • Verification of affected versions in inventory is necessary
  • Exposure assessment is required for systems using GStreamer's H.266 codec parser library

Technical summary

The vulnerability exists in the DCI parsing function of GStreamer's H.266 codec parser library (libgstcodecparsers). An out-of-bounds write can occur when a reserved field value is incorrectly accepted, causing the parser to write beyond the bounds of an internal structure. This can potentially cause a crash or memory corruption in systems using the affected library. No standard GStreamer pipeline element currently invokes the affected code path. Defenders should prioritize verifying the presence of affected versions in their inventory and assess exposure in systems using GStreamer's H.266 codec parser library.

Defensive priority

Defenders should prioritize verifying the presence of affected versions in their inventory and assess exposure in systems using GStreamer's H.266 codec parser library.

Recommended defensive actions

  • Verify the presence of affected versions in inventory
  • Assess exposure in systems using GStreamer's H.266 codec parser library
  • Monitor for potential crashes or memory corruption
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, but information on exploitation, impact, and remediation is limited. Defenders should verify the presence of affected versions in their inventory and assess exposure in systems using GStreamer's H.266 codec parser library. The vulnerability exists in the DCI parsing function of GStreamer's H.266 codec parser library (libgstcodecparsers). An out-of-bounds write can occur when a reserved field value is incorrectly accepted, causing the parser to write beyond the bounds

Sources and references

Verified primary and authoritative sources

  • CVE-2026-100229 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-100229

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-100229 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-100229

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.