Gstreamer1-plugins-good: gstreamer: unsigned integer underflow in avidemux fujifilm strd parsing leading to out-of-bounds read/write

Description

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).

Scores

EPSS (exploitation in 30 days)

0.15% · top 96% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.6.

Weakness

• CWE-191: Integer Underflow (Wrap or Wraparound) (opens in a new tab)All about CWE-191 and its CVEs

Affected products

• GStreamer · gst-plugins-good

  • affected < 1.28.6

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:1.26.7-2.el10_2.5 – < *

• Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support

  • unaffected 0:1.24.11-1.el10_0.4 – < *

• Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support

  • unaffected 0:1.10.4-4.el7_9.3 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:1.16.1-7.el8_10.3 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

  • unaffected 0:1.16.1-4.el8_4.2 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

  • unaffected 0:1.16.1-4.el8_4.2 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

  • unaffected 0:1.16.1-4.el8_6.3 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

  • unaffected 0:1.16.1-4.el8_6.3 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service

  • unaffected 0:1.16.1-5.el8_8.3 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

  • unaffected 0:1.16.1-5.el8_8.3 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:1.22.12-7.el9_8.4 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

  • unaffected 0:1.18.4-8.el9_2.3 – < *

• Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

  • unaffected 0:1.22.1-4.el9_4.3 – < *

• Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support

  • unaffected 0:1.22.12-5.el9_6.3 – < *

References (15)

• RHSA-2026:55434 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:55436 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:56966 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:65959 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:68642 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:68644 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:68645 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:69232 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:70264 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:70584 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:70803 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/security/cve/CVE-2026-73433 (opens in a new tab)vdb-entryx_refsource_REDHAT
• RHBZ#2514801 (opens in a new tab)issue-trackingx_refsource_REDHAT
• https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12231 (opens in a new tab)
• https://gstreamer.freedesktop.org/security/sa-2026-0072.html (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-73433](https://trackcve.app/badge/CVE-2026-73433.svg)](https://trackcve.app/cve/CVE-2026-73433)

Record last updated 23 Sept 2026, 15:06 UTC.