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High, CVSS 7.5amended

imgproxy has out-of-bounds heap read/write in ICO loader BMP header reconstruction that allows unauthenticated remote worker crash

GHSA-494m-4556-wf5p

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/imgproxy/imgproxy/v3 4.0.17), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary Out-of-bounds heap write in imgproxy's ICO loader (`vips/icoload.c`): when the ICO entry's image data buffer is small, the loader's BMP-header-reconstruction writes land past the allocation, corrupting the size field of the following heap chunk. The worker then aborts deterministically (glibc `munmap_chunk(): invalid pointer` → SIGABRT → Go panic, exit code 2).

Details In `vips_foreign_load_ico_header` in `vips/icoload.c`, after the ICO entry's image data is read into a heap buffer of `data_size + 14` bytes, the loader reconstructs a BMP file header in front of it using fields read from the ICO's internal BITMAPINFOHEADER: ``` uint32_t num_colors = GUINT32_FROM_LE(*(uint32_t *) (actual_data + 32)); // unvalidated uint16_t bpp = GUINT16_FROM_LE(*(uint16_t *) (actual_data + 14)); // unvalidated ``` ``` if ((num_colors == 0) && (bpp > 1` and, in cgo thread arenas, the `NON_MAIN_ARENA` bit lands in the `IS_MMAPPED` position of the corrupted word such that the next…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from osv record GHSA-494m-4556-wf5p

  2. Revision 1 · created ·

    Published from ghsa record GHSA-494m-4556-wf5p

Agent brief

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# Patch Next advisory brief: GHSA-494m-4556-wf5p

Advisory: imgproxy has out-of-bounds heap read/write in ICO loader BMP header reconstruction that allows unauthenticated remote worker crash
IDs: GHSA-494m-4556-wf5p
Record: https://patchnext.com/advisories/ghsa-494m-4556-wf5p (revision 2, source checked 31 Oct 2026, 06:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/imgproxy/imgproxy/v3 4.0.17. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/imgproxy/imgproxy/v3: affected >= 3.3.0, < 4.0.17; fixed in 4.0.17

## Suggested inspection (read-only)
- Go github.com/imgproxy/imgproxy/v3: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/imgproxy/imgproxy/v3.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-494m-4556-wf5p (GitHub-reviewed advisory GHSA-494m-4556-wf5p lists affected ranges: Go github.com/imgproxy/imgproxy/v3 >=3.3.0 <4.0.17)
- Verified: https://osv.dev/vulnerability/GHSA-494m-4556-wf5p (OSV record GHSA-494m-4556-wf5p lists affected ranges: Go github.com/imgproxy/imgproxy/v3 >=3.3.0 <4.0.17 (fixed))

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