CVE-2026-128240

Description

GPAC through 26.07.0 contains a use-after-free vulnerability in gf_sg_proto_del() in src/scenegraph/vrml_proto.c because gf_sg_reset() frees unregistered prototypes still referenced by scene commands. Attackers can supply a crafted XMT/BT scene declaring prototypes via commands, processed by MP4Box -chap, to trigger freed memory access and crash the process.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 6.8CVSS 4.0, Mediumfrom the CNA (VulnCheck)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
• 5.5CVSS 3.1, Mediumfrom the CNA (VulnCheck)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 13 Nov 2026 Published

Weakness

• CWE-416

References

• github.comissue-tracking
• github.compatch
• github.comtechnical-description
• github.comtechnical-description
• github.comexploit
• github.comproduct
• VulnCheck Advisory: GPAC through 26.07.0 Use-After-Free in gf_sg_proto_del During Scene Teardownthird-party-advisory