CVE-2026-124031
GPAC through 26.07.0 Type Confusion via drawable_get_aspect_2d_mpeg4
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| gpac gpac |
≥ 0; ≤ 26.07.0 (affected, custom)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.8 medium |
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 | CNA: VulnCheck |
| 3.1 / 5.5 medium |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | CNA: VulnCheck |
| 4.0 / 6.8 medium |
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
| 3.1 / 5.5 medium |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | NVD: [email protected] |
Exploit evidence
References
- https://github.com/gpac/gpac/issues/4030CNA: VulnCheck · issue-tracking
- https://github.com/gpac/gpacCNA: VulnCheck · product
- https://github.com/gpac/gpac/commit/43a8329a90ae2907716b593cc3746458516c7c39CNA: VulnCheck · patch
- https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/222/222_gf_node_get_tag_compositor_texturing_c_370.xmtCNA: VulnCheck · exploit
- https://github.com/gpac/gpac/blob/v26.07.0/src/compositor/drawable.c#L564-L565CNA: VulnCheck · technical-description
- https://www.vulncheck.com/advisories/gpac-through-26.07.0-type-confusion-via-drawable-get-aspect-2d-mpeg4CNA: VulnCheck · third-party-advisory
- https://github.com/gpac/gpac[email protected]
- https://github.com/gpac/gpac/blob/v26.07.0/src/compositor/drawable.c#L564-L565[email protected]
- https://github.com/gpac/gpac/commit/43a8329a90ae2907716b593cc3746458516c7c39[email protected]
- https://github.com/gpac/gpac/issues/4030[email protected]
- https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/222/222_gf_node_get_tag_compositor_texturing_c_370.xmt[email protected]
- https://www.vulncheck.com/advisories/gpac-through-26.07.0-type-confusion-via-drawable-get-aspect-2d-mpeg4[email protected]
For agents and automation
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