# CVE-2026-46601: Go x/image/webp denial of service via mismatched VP8 dimensions

Source: https://junglewise.ai/threats/cve-2026-46601-go-x-image-webp-denial-of-service-via-mismatched-vp8-dimensions  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25. Updated: 2026-06-25  
License: CC BY 4.0 with a link back

CVE-2026-46601 · Severity: info · CVSS 0 · Published 2026-06-25

A vulnerability exists in a Go library used for processing WebP images. If an application uses this library to decode a specially crafted image file, it can cause the application to crash (panic). This could lead to a denial-of-service, where the service becomes unavailable to users.

Technologies: [golang.org/x/image (Go)](https://junglewise.ai/threats/technologies/golang-org-x-image). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-46601 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-46601 being exploited in the wild.

**How severe is CVE-2026-46601?** Informational severity, with a CVSS score of 0, published 25 June 2026.

**Which products and versions are affected?** golang.org/x/image (Go) SEMVER:introduced=0,fixed=0.43.0.

**Is there a fix for CVE-2026-46601?** Yes. golang.org/x/image (Go): upgrade to 0.43.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-46601 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-46601?** Check whether you run golang.org/x/image (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- golang.org/x/image (Go): upgrade to 0.43.0 or later

  ```sh
  go get golang.org/x/image@v0.43.0
  ```


## Technical details

A vulnerability in the golang.org/x/image/webp package allows for a denial-of-service (DoS) via a panic during image decoding. The root cause is a failure to validate that the dimensions within a VP8 chunk match the overall WebP canvas size. When an input contains an ALPH chunk alongside a mismatched VP8 chunk, the decoder constructs an image object with inconsistent internal data. Subsequent attempts to access the alpha channel result in an out-of-bounds memory access, triggering a Go panic. This issue is fixed in version 0.43.0 of the golang.org/x/image library.

## Affected products

- Go Project golang.org/x/image/webp < 0.43.0

## Identifiers

- CVE-2026-46601
- GO-2026-5061

## Timeline

- 2026-06-05: disclosed: Issue reported on GitHub
- 2026-06-18: advisory: Go vulnerability report published
- 2026-06-25: advisory: NVD entry published

## References

- [https://pkg.go.dev/](https://pkg.go.dev/)
- [https://go.dev/cl/787681](https://go.dev/cl/787681)
- [https://go.dev/issue/79869](https://go.dev/issue/79869)
- [https://pkg.go.dev/vuln/GO-2026-5061](https://pkg.go.dev/vuln/GO-2026-5061)

## Related threats

- [GO-2026-6222 - Excessive memory allocation during VP8L decoding in golang.org/x/image](https://junglewise.ai/threats/cve-2026-46603-go-2026-6222-excessive-memory-allocation-during-vp8l-decoding-in)
- [Go x/image/tiff denial of service via out-of-bounds strip offset](https://junglewise.ai/threats/cve-2026-46604-go-x-image-tiff-denial-of-service-via-out-of-bounds-strip-offset)
- [Go x/image/tiff unbounded memory consumption in TIFF decoder](https://junglewise.ai/threats/cve-2026-46602-go-x-image-tiff-unbounded-memory-consumption-in-tiff-decoder)
- [Go x/image/tiff resource exhaustion in PackBits decompression](https://junglewise.ai/threats/cve-2026-46599-go-x-image-tiff-resource-exhaustion-in-packbits-decompression)
- [Go x/image panic in BMP decoder](https://junglewise.ai/threats/cve-2026-42500-go-x-image-panic-in-bmp-decoder)