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Advisory severityMedium6.6Red Hat Linux

Medium [CVE-2026-73433] unsigned integer underflow in avidemux FUJIFILM strd parsing leading to out-of-bounds read/write

This medium-severity Red Hat Linux advisory covers CVE-2026-73433 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-73433 Source published Source updated

VulniPulse record published Record updated

CVE-2026-73433
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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Summary

A flaw was found in GStreamer gst-plugins-good (avidemux). When parsing FUJIFILM metadata in an AVI strd chunk, gst_avi_demux_parse_strd() decrements a remaining-length counter by fixed offsets (98 and 10 bytes) without verifying sufficient data remains.

For crafted strd payloads of exactly 106 or 107 bytes, the counter underflows to a very large unsigned value, causing subsequent null-terminated string scanning to read far beyond the allocated heap buffer. Date-format normalization may also write beyond the buffer end.

Confirmed impacts include heap out-of-bounds read, out-of-bounds write, heap information disclosure (adjacent data appearing in parsed metadata), and application crash/denial of service. The avidemux element is auto-plugged by playbin, decodebin, and gst-discoverer, so opening or previewing a crafted AVI is sufficient to trigger the issue.

Red Hat severity: Moderate — CVSS 6.6 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H). Weakness: CWE-191.

Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2026:55434, RHSA-2026:65959, RHSA-2026:56966, RHSA-2026:55436.

Affected products named by the advisory: Red Hat package: gstreamer1-plugins-good.

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 23 days ago·verify at source

Fixed versions
  • gstreamer1-plugins-good-0:1.26.7-2.el10_2.5
  • gstreamer1-plugins-good-0:1.24.11-1.el10_0.4
  • gstreamer1-plugins-good-0:1.16.1-7.el8_10.3
  • gstreamer1-plugins-good-0:1.22.12-7.el9_8.4
  • RHSA-2026:55434
  • RHSA-2026:65959
  • RHSA-2026:56966
  • RHSA-2026:55436

Official advisory · high-confidence parse· fetched 23 days ago·verify at source

Mitigation

Upgrade to a fixed release: gstreamer1-plugins-good-0:1.26.7-2.el10_2.5, gstreamer1-plugins-good-0:1.24.11-1.el10_0.4, gstreamer1-plugins-good-0:1.16.1-7.el8_10.3, gstreamer1-plugins-good-0:1.22.12-7.el9_8.4, RHSA-2026:55434, RHSA-2026:65959. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 23 days ago·verify at source

Discussion(0)

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