CVE-2026-54260 Wagtail: Denial of service via unbounded filter specs in the image preview

Medium 4.3 Published 1 Jul 2026 Updated 2 Jul 2026

Authenticated admin users can cause service degradation by submitting unbounded image filter specifications in Wagtail CMS.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-54260?

CVE-2026-54260 is a medium-severity denial of service vulnerability in wagtail, published on 1 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Wagtail is an open source content management system built on Django. In versions prior to 7.0.8, 7.3.3 and 7.4.2, an authenticated admin user can trigger expensive rendition processing with purposefully crafted filter specs resulting in potentially service degradation. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. This issue has been fixed in versions 7.0.8, 7.3.3, and 7.4.2.

Weakness: CWE-400

Which versions are affected by CVE-2026-54260?

7 open source packages ship an affected version, including wagtail. It affects 1 product.

Package	Affected	Fixed in
`wagtail` PyPI	All versions	`7.0.8, 7.3.3, 7.4.2`
`wagtail` PyPI	All versions	`7.0.8`
`wagtail` PyPI	All versions	`7.0.8`
`wagtail` PyPI	From `7.1`	`7.3.3`
`wagtail` PyPI	From `7.1`	`7.3.3`
`wagtail` PyPI	From `7.4`	`7.4.2`

1 more packages

wagtail PyPI From 7.4 7.4.2

Products include Torchbox Wagtail.

How do I fix CVE-2026-54260?

Upgrade wagtail to a fixed version for your release line: 7.0.8, 7.3.3 or 7.4.2.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-54260 being exploited?

There is no known exploitation of CVE-2026-54260 in the wild and no public exploit code.

Sources

Also known as GHSA-f2p5-j6fg-5cxf, PYSEC-2026-613.