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HIGH severity

Imageflow affected by libwebp zero-day and should not be used with malicious source imagesGHSA-7vpr-3ppw-qrpj

HIGHFix: imazen/imageflow@2489494

GHSA-7vpr-3ppw-qrpj is a high-severity (CVSS 8.8) vulnerability in Imageflow.AllPlatforms. A fix is available for Imageflow.AllPlatforms — see the affected versions and patch details below.

Published
Updated
Affected
21 pkgs
Patched
13 / 21
Exploits
None indexed
Exploitation data as of Sep 10, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

21 pkgs affected
.NETImageflow.AllPlatforms.NETImageflow.NativeRuntime.win-x86_64.NETImageflow.NativeRuntime.osx-x86_64.NETImageflow.NativeRuntime.win-x86.NETImageflow.NativeRuntime.ubuntu-x86_64.NETImageflow.NativeRuntime.ubuntu-x86_64-haswell.NETImageflow.NativeTool.win-x86_64.NETImageflow.NativeTool.osx-x86_64+13 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

Impact

This vulnerability affects deployments of Imageflow that involve decoding or processing malicious source .webp files. If you only process your own trusted files, this should not affect you (but you should update anyway).

Imageflow relies on Google's [libwebp] library to decode .webp images, and is affected by the recent zero-day out-of-bounds write vulnerability CVE-2023-4863 and https://github.com/advisories/GHSA-j7hp-h8jx-5ppr. The libwebp vulnerability also affects Chrome, Android, macOS, and other consumers of the library).

libwebp patched the vulnerability and released 1.3.2

This was patched in libwebp-sys in 0.9.3 and 0.9.4

Imageflow v2.0.0-preview8 uses the patched version of libwebp as well as updated versions of all dependencies.

Note: preview 8 requires libc 2.31 or higher on linux and macOS 11 or higher. These restrictions are due to the oldest supported versions of those platforms (which is reflected on Github Actions).

Patches

Imageflow v2.0.0-preview8 use the patched version (v1.3.2) of libwebp and libwebp-sys 0.9.4. Imageflow.AllPlatforms 0.10.2 is patched Imageflow.Server v0.8.2 is patched ImageResizer.Plugins.Imageflow 5.0.12 is patched

Workarounds

Disable webp decoding using EnabledCodecs::disable_decoder(NamedDecoders::WebPDecoder) if using the Rust API.

Only files that meet the following criteria will be passed to libwebp:

bytes.starts_with(b"RIFF") && bytes[8..12].starts_with(b"WEBP")

You can utilize matching logic to block webp inputs in your language of choice.

References

https://github.com/advisories/GHSA-j7hp-h8jx-5ppr https://nvd.nist.gov/vuln/detail/CVE-2023-4863 https://github.com/webmproject/libwebp/commit/2af26267cdfcb63a88e5c74a85927a12d6ca1d76 https://github.com/NoXF/libwebp-sys/commits/master

Affected Packages

21 total 13 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetImageflow.AllPlatformsall versions0.10.2dotnet add package Imageflow.AllPlatforms --version 0.10.2
.NETNuGetImageflow.NativeRuntime.win-x86_64all versions2.0.0-preview6dotnet add package Imageflow.NativeRuntime.win-x86_64 --version 2.0.0-preview6
.NETNuGetImageflow.NativeRuntime.osx-x86_64all versions2.0.0-preview6dotnet add package Imageflow.NativeRuntime.osx-x86_64 --version 2.0.0-preview6
.NETNuGetImageflow.NativeRuntime.win-x86all versions2.0.0-preview6dotnet add package Imageflow.NativeRuntime.win-x86 --version 2.0.0-preview6
.NETNuGetImageflow.NativeRuntime.ubuntu-x86_64all versions2.0.0-preview6dotnet add package Imageflow.NativeRuntime.ubuntu-x86_64 --version 2.0.0-preview6
.NETNuGetImageflow.NativeRuntime.ubuntu-x86_64-haswellall versions2.0.0-preview6dotnet add package Imageflow.NativeRuntime.ubuntu-x86_64-haswell --version 2.0.0-preview6

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Imageflow.AllPlatforms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update Imageflow.AllPlatforms to 0.10.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7vpr-3ppw-qrpj is resolved across your whole dependency graph.

  3. Workarounds

    Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

Frequently Asked Questions

### Impact This vulnerability affects deployments of Imageflow that involve decoding or processing malicious source .webp files. If you only process your own trusted files, this should not affect you (but you should update anyway). Imageflow relies on Google's [libwebp] library to decode .webp images, and is affected by the recent zero-day out-of-bounds write vulnerability [CVE-2023-4863](https://nvd.nist.gov/vuln/detail/CVE-2023-4863) and https://github.com/advisories/GHSA-j7hp-h8jx-5ppr. The libwebp vulnerability also affects Chrome, Android, macOS, and other consumers of the library). l
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Imageflow affected by libwebp zero-day and should not…