CVE-2026-73433

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. Fixed upstream in gst-plugins-good 1.28.6 (GStreamer-SA-2026-0072).

Affected Software

VendorProductVersion RangeStatus
GStreamergst-plugins-good0 < 1.28.6affected
Red HatRed Hat Enterprise Linux 100:1.26.7-2.el10_2.5 < *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:1.24.11-1.el10_0.4 < *unaffected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support0:1.10.4-4.el7_9.3 < *unaffected
Red HatRed Hat Enterprise Linux 80:1.16.1-7.el8_10.3 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:1.16.1-4.el8_4.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On0:1.16.1-4.el8_4.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support0:1.16.1-4.el8_6.3 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On0:1.16.1-4.el8_6.3 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service0:1.16.1-5.el8_8.3 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions0:1.16.1-5.el8_8.3 < *unaffected
Red HatRed Hat Enterprise Linux 90:1.22.12-7.el9_8.4 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions0:1.18.4-8.el9_2.3 < *unaffected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions0:1.22.1-4.el9_4.3 < *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support0:1.22.12-5.el9_6.3 < *unaffected

Weaknesses

  • CWE-191: Integer Underflow (Wrap or Wraparound)

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References