What is CVE-2026-124030?

CVE-2026-124030 is a medium-severity vulnerability in Gpac, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 5.5/10. Published 2026-11-06.

How severe is CVE-2026-124030?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Gpac

CVE-2026-124030

GPAC through 26.07.0 contains a type confusion vulnerability in gf_sg_command_apply() in src/scenegraph/commands.c that fails to verify BIFS field-replace command types match target node fields. Attackers can supply a crafted XMT file opened with MP4Box, such as via chapter import, causing gf_sg_vrml_field_clone() to memcpy from invalid pointers and crash.

Published 2026-11-06 · last modified 2026-11-06.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Gpac

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

github.com/gpac/gpac (product)
github.com/gpac/gpac/blob/v26.07.0/src/scenegraph/commands.c (technical-description)
github.com/gpac/gpac/commit/1359c4da9329cedceeb8fcfeab6d97e0927236e1 (patch)
GitHub Issue #4032 (issue-tracking)
github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/224/224_gf_sg_command_apply_… (exploit)
VulnCheck Advisory: GPAC through 26.07.0 Type Confusion via gf_sg_command_apply XMT Field-Replace (third-party-advisory)

Frequently asked questions

What is CVE-2026-124030?: CVE-2026-124030 is a medium-severity vulnerability in Gpac, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 5.5/10. Published 2026-11-06.
How severe is CVE-2026-124030?: Medium severity. CVSS v3 base score is 5.5 out of 10.