CVE-2026-128240

EUVD-2026-125052
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
5.5 MEDIUM
LOCAL
LOW
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 6.07%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
gpacgpac
𝑥
≤ 26.7.0
CNA
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
gpac
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
dne
stonking
dne
trusty
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://github.com/gpac/gpac
https://github.com/gpac/gpac/blob/v26.07.0/src/scenegraph/base_scenegraph.c#L537-L542
https://github.com/gpac/gpac/blob/v26.07.0/src/scenegraph/vrml_proto.c#L103-L111
https://github.com/gpac/gpac/commit/a2e5c62c213b5329a4572fe8e7c333e1ca26d028
https://github.com/gpac/gpac/issues/4031
https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/223/223_gf_sg_proto_del_scenegraph_vrml_proto_c.xmt
https://www.vulncheck.com/advisories/gpac-through-26.07.0-use-after-free-in-gf-sg-proto-del-during-scene-teardown