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CVE-2026-1940: Gstreamer: incomplete fix of cve-2026-1940

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-23 · updated 2026-06-17
• Weakness: CWE-125

Description

An incomplete fix for CVE-2024-47778 allows an out-of-bounds read in gst_wavparse_adtl_chunk() function. The patch added a size validation check lsize + 8 > size, but it does not account for the GST_ROUND_UP_2(lsize) used in the actual offset calculation. When lsize is an odd number, the parser advances more bytes than validated, causing OOB read.

Affected products

• Debian Linux: 11.0, 12.0
• GStreamer Good Plug-ins: 1.0.0
• GStreamer: before 1.28.1 — fixed in 1.28.1
• Red Hat Enterprise Linux: 7.0, 8.0, 9.0, 10.0

How to fix

Upgrade to a fixed version: GStreamer 1.28.1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2026-1940
• https://bugzilla.redhat.com/show_bug.cgi?id=2436932
• https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/4854
• https://gstreamer.freedesktop.org/security/sa-2026-0001.html
• https://security-tracker.debian.org/tracker/CVE-2026-1940

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