# CVE-2026-79513: GPAC divide-by-zero in dash_client timeline parsing

Source: https://junglewise.ai/threats/cve-2026-79513-gpac-divide-by-zero-in-dash-client-timeline-parsing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-09. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-79513 · Severity: medium · CVSS 6.5 · Published 2026-09-09

GPAC is an open-source multimedia framework used to play and stream audio and video content. A flaw in how it processes DASH video streaming manifest files (MPD) can be exploited via a crafted manifest to crash the player, causing a denial of service. An attacker hosting a malicious video stream could render playback unavailable for users connecting to it.

Technologies: [Gpac](https://junglewise.ai/threats/technologies/gpac). Vendors: [Gpac](https://junglewise.ai/threats/vendors/gpac).

## Quick answers

**Is CVE-2026-79513 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-79513 being exploited in the wild.

**How severe is CVE-2026-79513?** Medium severity, with a CVSS score of 6.5, published 9 September 2026.

**Which products and versions are affected?** Gpac v26.07.0.

**Is there a fix for CVE-2026-79513?** A patch was published on 2026: Fix committed in commit 2fd5a06ab226767900fd86edb5a1e8bfc1010640 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-79513 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-79513?** Check whether you run Gpac at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A divide-by-zero vulnerability exists in the gf_dash_get_timeline_duration function in src/media_tools/dash_client.c. The DASH MPD parser stores segment duration attributes without validating they are non-zero, then later performs division by this duration value when calculating segment counts, triggering a floating-point exception (SIGFPE). The vulnerability is triggered when a crafted MPD file contains a SegmentTimeline element with d="0" (e.g., <S t="0" d="0" r="-1"/>). An attacker can exploit this via network by hosting a malicious MPD file and directing users to stream from it; no authentication or user interaction beyond clicking a link is required. Successful exploitation crashes the GPAC process. A fix has been committed to the repository (commit 2fd5a06ab226767900fd86edb5a1e8bfc1010640).

## Affected products

- GPAC GPAC v26.07.0

## Timeline

- 2026-08-19: disclosed: Security issue reported on GitHub
- 2026-09-09: advisory: CVE-2026-79513 published
- 2026: patched: Fix committed in commit 2fd5a06ab226767900fd86edb5a1e8bfc1010640

## References

- [https://github.com/gpac/gpac/commit/2fd5a06ab226767900fd86edb5a1e8bfc1010640](https://github.com/gpac/gpac/commit/2fd5a06ab226767900fd86edb5a1e8bfc1010640)
- [https://github.com/gpac/gpac/issues/3862](https://github.com/gpac/gpac/issues/3862)

## Related threats

- [GPAC type confusion in drawable_get_aspect_2d_mpeg4 and TraverseShape](https://junglewise.ai/threats/cve-2026-124031-gpac-through-26-07-0-contains-a-type-confusion-vulnerability-in)
- [GPAC type confusion in gf_sg_command_apply](https://junglewise.ai/threats/cve-2026-124030-gpac-through-26-07-0-contains-a-type-confusion-vulnerability-in)
- [GPAC out-of-bounds write in AIT parser](https://junglewise.ai/threats/cve-2026-109827-a-vulnerability-has-been-found-in-gpac-up-to-26-07-0-this)
- [GPAC use after free in MP4Box filter queue](https://junglewise.ai/threats/cve-2026-108539-a-vulnerability-was-detected-in-gpac-up-to-26-07-0-this-affects)
- [GPAC buffer overflow in DASH Client URL resolution](https://junglewise.ai/threats/cve-2026-103227-a-weakness-has-been-identified-in-gpac-up-to-26-07-0-affected-by)