# CVE-2025-15534: raysan5 raylib rtext.c LoadFontData integer overflow

> A local attacker can trigger an integer overflow in raylib's font loading function, potentially causing a denial of service.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Jan 2026
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-4696-58w6-rqw4, JLSEC-2026-531

## What is CVE-2025-15534?

CVE-2025-15534 is a medium-severity vulnerability in raysan5 raylib, published on 18 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability was identified in raysan5 raylib up to 909f040. Affected by this issue is the function LoadFontData of the file src/rtext.c. The manipulation leads to integer overflow. The attack can only be performed from a local environment. The exploit is publicly available and might be used. The identifier of the patch is 5a3391fdce046bc5473e52afbd835dd2dc127146. It is suggested to install a patch to address this issue.

Weakness: CWE-190 (Integer Overflow or Wraparound), CWE-189

## Which versions are affected by CVE-2025-15534?

It affects 1 product.


Products: Raylib Raylib.

## How do I fix CVE-2025-15534?

Apply the vendor's patch.

## Is CVE-2025-15534 being exploited?

There is no known exploitation of CVE-2025-15534 in the wild and no public exploit code.

## Other vulnerabilities in raysan5 raylib

- [CVE-2023-26123](https://insights.sbomify.com/CVE-2023-26123/): Cross-site scripting in raysan5/raylib (medium 6.1)
- [CVE-2025-15533](https://insights.sbomify.com/CVE-2025-15533/): raysan5 raylib rtext.c GenImageFontAtlas heap-based overflow (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-15534 and fix it if it is affected.

What it is: CVE-2025-15534 is a medium-severity vulnerability in raysan5 raylib, published on 18 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-15534 in the wild and no public exploit code.

Affected product: raysan5 raylib. 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-2025-15534/ (Markdown: https://insights.sbomify.com/CVE-2025-15534/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-15534
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-15534
- OSV: https://osv.dev/vulnerability/CVE-2025-15534

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-15534/
Summaries are generated and may contain mistakes; the official description above is the record.