# CVE-2026-102729: Memory corruption in GUIX

> A buffer overflow in Eclipse GUIX allows attackers to execute arbitrary code or cause denial of service via crafted theme resources.

- **Severity:** Medium 5.9 (`CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **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:** 29 Sep 2026
- **Updated:** 29 Sep 2026
- **Also known as:** GHSA-372w-c338-xj8p, GHSA-xj26-f3rj-75vp

## What is CVE-2026-102729?

CVE-2026-102729 is a medium-severity memory corruption vulnerability in Eclipse Foundation GUIX, published on 29 Sep 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

`gx_binres_theme_load()` sizes its theme buffer for the theme it was asked for, and allocates it even when the resource holds no theme with that id. A theme id at or past the theme count declared by the resource gets a buffer of zero bytes. The load pass then walks past the end of the theme table, takes whatever follows as a theme header, and writes a `GX_THEME` and its tables into that zero-byte buffer.

Weakness: CWE-787 (Out-of-bounds Write), CWE-131 (Incorrect Calculation of Buffer Size)

## Which versions are affected by CVE-2026-102729?


## How do I fix CVE-2026-102729?

No fix has been published for CVE-2026-102729 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-102729 being exploited?

There is no known exploitation of CVE-2026-102729 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-102729 and fix it if it is affected.

What it is: CVE-2026-102729 is a medium-severity memory corruption vulnerability in Eclipse Foundation GUIX, published on 29 Sep 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: There is no known exploitation of CVE-2026-102729 in the wild and no public exploit code.

Affected product: Eclipse Foundation GUIX. 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-2026-102729/ (Markdown: https://insights.sbomify.com/CVE-2026-102729/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-102729
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-102729
- OSV: https://osv.dev/vulnerability/CVE-2026-102729

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-102729/
Summaries are generated and may contain mistakes; the official description above is the record.