Medium [CVE-2026-88914] integer overflow and out-of-bounds read in qtdemux CEA-608 closed-caption parser
This medium-severity Red Hat Linux advisory covers CVE-2026-88914.
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Summary
A flaw was found in GStreamer's gst-plugins-good isomp4 plugin. When processing a specially crafted MP4 or MOV file containing CEA-608 closed-caption data, an integer overflow in 32-bit unsigned arithmetic can bypass a bounds check in the caption parser.
This leads to an out-of-bounds heap read of up to 244 bytes, which is then included in the downstream caption output. An attacker could exploit this by tricking a user into opening a malicious media file, potentially resulting in disclosure of adjacent heap memory or application crash.
This vulnerability is rated as Moderate because exploitation requires a user to open a crafted MP4 or MOV file and the issue is limited to an out-of-bounds read of up to approximately 244 bytes of adjacent heap memory. Code execution is not possible from this read-only flaw.
Red Hat product impact analysis is pending component mapping to determine which products ship the affected gst-plugins-good qtdemux CEA-608 caption parsing code path. Red Hat severity: Moderate — CVSS 4.4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L).
Weakness: CWE-190.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 20 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 20 minutes ago·verify at source
Mitigation checklist
- No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
Official advisory · high-confidence parse· fetched 20 minutes ago·verify at source
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