CVE-2021-45259

What it actually does

Invalid pointer reference in gf_svg_node_del causes segmentation fault and application crash via memory corruption.

Why it matters to the business

Application becomes unavailable when processing untrusted media files, leading to denial of service for users and workflows relying on the software; low EPSS and no KEV listing indicate limited observed exploitation despite public exploit availability after 1764 days.

How an attack unfolds

An attacker crafts a malformed file that reaches gf_svg_node_del with an invalid pointer; when a user opens the file locally the dereference triggers a crash. Public exploit code exists but no named threat actors or ransomware campaigns are associated.

How to fix it

Upgrade to a maintained release of gpac that resolves the pointer handling issue in gf_svg_node_del; where an upgrade path is unavailable, restrict processing of untrusted files and run the application under a sandbox or least-privilege user context.

How to confirm the fix worked

Confirm the installed gpac version is newer than 1.1.0 and test with known-triggering malformed files to verify absence of the crash; review build logs or package manifests for the corrected gf_svg_node_del implementation.

Typical attack path

1. Identify or create a malformed SVG or media file that triggers gf_svg_node_del
2. Deliver the file to the target via email, web download, or shared storage
3. Victim opens the file with the affected gpac binary
4. Invalid pointer dereference occurs resulting in immediate segmentation fault and crash

How to detect it

Review application crash logs and core dumps for references to gf_svg_node_del; correlate local file-open events with sudden gpac process termination on systems where the software is installed.

• gf_svg_node_del
• segmentation fault.*gpac
• SIGSEGV.*gpac

What your security team should do

• Prioritize upgrade of all gpac installations to the latest stable release
• Block or sandbox execution of gpac against untrusted inputs until patched
• Monitor upstream gpac commits and package repositories for explicit fixes addressing CVE-2021-45259