CVE-2026-128240

MEDIUM 5.5

GPAC through 26.07.0 Use-After-Free in gf_sg_proto_del During Scene Teardown

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-416
Vendor	gpac
Product	gpac
Published	Nov 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

gpac / gpac

0 ≤ 26.07.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/gpac/gpac/issues/4031 github.com: https://github.com/gpac/gpac/commit/a2e5c62c213b5329a4572fe8e7c333e1ca26d028 github.com: https://github.com/gpac/gpac/blob/v26.07.0/src/scenegraph/vrml_proto.c#L103-L111 github.com: https://github.com/gpac/gpac/blob/v26.07.0/src/scenegraph/base_scenegraph.c#L537-L542 github.com: https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/223/223_gf_sg_proto_del_scenegraph_vrml_proto_c.xmt github.com: https://github.com/gpac/gpac vulncheck.com: https://www.vulncheck.com/advisories/gpac-through-26.07.0-use-after-free-in-gf-sg-proto-del-during-scene-teardown

Credits

Alexander A. Shvedov (sigdevel) Jean Le Feuvre