CVE-2026-46599: Excessive resource consumption in PackBits decompression in golang.org/x/image/tiff

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-29 · updated 2026-07-22
Weakness: CWE-770

Description

The TIFF decoder does not place a limit on the size of PackBits-compressed data. A maliciously-crafted image can exploit this to cause a small image (both in terms of pixel width/height and encoded size) to make the decoder decode large amounts of compressed data.

Affected products

golang.org/x/image/tiff: before 0.41.0 — fixed in 0.41.0

How to fix

Upgrade to a fixed version: golang.org/x/image/tiff 0.41.0. Check the vendor advisory for mitigations.

References

https://go.dev/cl/759960
https://go.dev/issue/79577
https://groups.google.com/g/golang-announce/c/uhYX90BlBvI
https://pkg.go.dev/vuln/GO-2026-5032

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