# CVE-2026-39103: Memory corruption in n/a

> An attacker can cause a denial of service in the GPAC library via a buffer overflow in SVG attribute parsing.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 5 May 2026
- **Updated:** 6 May 2026
- **Also known as:** DEBIAN-CVE-2026-39103, GHSA-fww4-38vg-fx8g, UBUNTU-CVE-2026-39103

## What is CVE-2026-39103?

CVE-2026-39103 is a medium-severity memory corruption vulnerability in Gpac Gpac, published on 5 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Buffer Overflow vulnerability in GPAC before commit v391dc7f4d234988ea0bc3cc294eb725eddf8f702 allows an attacker to cause a denial of service via the src/scenegraph/svg_attributes.c, svg_parse_strings(), gf_svg_parse_attribute()

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2026-39103?

It affects 1 product.


Products: Gpac Gpac.

## How do I fix CVE-2026-39103?

No fix has been published for CVE-2026-39103 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-39103 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39103 exists.

## Other vulnerabilities in Gpac Gpac

- [CVE-2023-46427](https://insights.sbomify.com/CVE-2023-46427/): Null dereference in n/a (critical 9.8)
- [CVE-2023-46932](https://insights.sbomify.com/CVE-2023-46932/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-36190](https://insights.sbomify.com/CVE-2022-36190/): Use after free in n/a (critical 9.8)
- [CVE-2021-28300](https://insights.sbomify.com/CVE-2021-28300/): Null dereference in n/a (critical 9.8)
- [CVE-2020-11558](https://insights.sbomify.com/CVE-2020-11558/): Use after free in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-39103 and fix it if it is affected.

What it is: CVE-2026-39103 is a medium-severity memory corruption vulnerability in Gpac Gpac, published on 5 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39103 exists.

Affected product: Gpac Gpac. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-39103/ (Markdown: https://insights.sbomify.com/CVE-2026-39103/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-39103
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39103
- OSV: https://osv.dev/vulnerability/CVE-2026-39103

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-39103/
Summaries are generated and may contain mistakes; the official description above is the record.