High [CVE-2026-70628] Arbitrary code execution via crafted WTV file in DVB subtitle parser
This high-severity Red Hat Linux advisory covers CVE-2026-70628 affecting Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI).
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Summary
FFmpeg versions from 0.5 up to, but not including, 9.0 contain a signed integer overflow vulnerability in the DVB subtitle parser in libavcodec/dvbsub_parser.c that allows attackers to trigger a heap buffer overflow by supplying a crafted WTV file.
The overflow causes the bounds-check guard expression to wrap to INT_MIN, bypassing the PARSE_BUF_SIZE comparison and invoking memcpy() with attacker-controlled data into a heap buffer, resulting in an out-of-bounds heap write and potential memory corruption or code execution. A flaw was found in FFmpeg.
An attacker could exploit a signed integer overflow vulnerability within the DVB subtitle parser by providing a specially crafted WTV (Windows Recorded TV Show) file. While exploitation requires a local attacker to entice a user into processing a specially crafted WTV file, successful exploitation could lead to arbitrary code execution.
This risk is elevated due to FFmpeg's common use in multimedia processing within Red Hat environments. Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
Weakness: CWE-805. Affected Red Hat products: Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI).
Red Hat does not currently list a fixing RHSA for this CVE.
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 1 hour 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 1 hour ago·verify at source
Mitigation checklist
- To mitigate this issue, avoid processing untrusted WTV (Windows Recorded TV Show) files, especially those containing DVB subtitles. Exercise caution when handling multimedia files from unknown or suspicious sources.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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