CVE-2026-124031: GPAC through 26.07.0 contains a type confusion vulnerability in drawable_get_aspect_2d_mpeg4() and TraverseSha

Q: How do I fix CVE-2026-124031?

gpac: upgrade to newer than 26.07.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-124031 being exploited?

CVE-2026-124031 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-124031 affect?

CVE-2026-124031 affects gpac. Severity is medium (CVSS 5.5). GPAC through 26.07.0 contains a type confusion vulnerability in drawable_get_aspect_2d_mpeg4() and TraverseShape() that casts a Shape's appearance node to M_Appearance without checking its node tag. Attackers can supply a crafted XMT file p

Q: How urgent is CVE-2026-124031?

Priority 19/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2026-124031 is a medium-severity flaw (CVSS 5.5) affecting gpac. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

GPAC through 26.07.0 contains a type confusion vulnerability in drawable_get_aspect_2d_mpeg4() and TraverseShape() that casts a Shape's appearance node to M_Appearance without checking its node tag. Attackers can supply a crafted XMT file placing another node type, such as Conditional, in the appearance field to trigger an invalid memory read and crash MP4Box.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-843
Published	2026-11-06
Last modified	2026-11-06

Publisher (CNA): VulnCheck · Vendor: gpac · Source: CVE Program record (NVD analysis pending)

Last updated 2026-11-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-11-06 19:14 UTCPublished CVE record published
2026-11-06 19:14 UTCUpdated Record last modified

gpac gpac UPGRADE

Affected: <= 26.07.0

Fixed in: newer than 26.07.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy gpac || rpm -q gpac || gpac --version

2. UPGRADE to newer than 26.07.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gpac

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gpac

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-124031?

gpac: upgrade to newer than 26.07.0. Exact commands for each OS are on this page.

Is CVE-2026-124031 being exploited?

CVE-2026-124031 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-124031 affect?

CVE-2026-124031 affects gpac. Severity is medium (CVSS 5.5). GPAC through 26.07.0 contains a type confusion vulnerability in drawable_get_aspect_2d_mpeg4() and TraverseShape() that casts a Shape's appearance node to M_Appearance without checking its node tag. Attackers can supply a crafted XMT file p

How urgent is CVE-2026-124031?

Priority 19/100. No elevated risk signals yet.

Related CVEs

CVE-2026-124030 MEDIUM 5.5 UPGRADE GPAC through 26.07.0 contains a type confusion vulnerability in gf_sg_command_apply() in src/scenegraph/comman
CVE-2021-4043 MEDIUM 5.5 UPGRADE MITIGATE NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.
CVE-2025-60467 HIGH 7.5 UPGRADE A use-after-free in the gf_filter_pid_inst_swap_delete_task function (/filter_core/filter_pid.c) of GPAC Proje
CVE-2025-60474 HIGH 7.5 UPGRADE A buffer overflow in the gf_media_import function (/media_tools/av_parsers.c) of GPAC Project/MP4Box before 26
CVE-2025-60464 HIGH 7.8 UPGRADE A use-after-free in the gf_sei_load_from_state_internal function (/filters/sei_load.c) of GPAC Project/MP4Box

References

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