EUVD-2026-41146
GHSA-f2p5-j6fg-5cxf
Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
Description explicitly requires 'admin user' access, warranting PR:H over PR:L; no confidentiality or integrity impact; availability impact is limited to service degradation.
Primary rating from Vendor (GitHub_M).
CVSS VectorNVD
Lifecycle Timeline
4Blast Radius
ecosystem impact- 1 pypi packages depend on wagtail (1 direct, 0 indirect)
Ecosystem-wide dependent count for version 7.1.
DescriptionNVD
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.
AnalysisAI
Wagtail CMS versions prior to 7.0.8, 7.3.3, and 7.4.2 expose a resource exhaustion vector where authenticated admin users can submit purposefully crafted image filter specification strings that trigger disproportionately expensive rendition processing on the server, resulting in service degradation for all site users. The vulnerability is constrained to admin-level authenticated users and cannot be triggered by ordinary unauthenticated site visitors, materially limiting real-world attack surface. No public exploit code and no CISA KEV listing have been identified at time of analysis, placing this in the low-priority tier for most deployments.
Technical ContextAI
Wagtail is an open-source content management system built on the Django web framework and implemented in Python (CPE: cpe:2.3:a:wagtail:wagtail:*:*:*:*:*:*:*:*). The vulnerability resides in Wagtail's image rendition processing subsystem, which generates image variants based on filter specification strings provided via the admin interface (e.g., resize, crop, or quality directives). CWE-400 (Uncontrolled Resource Consumption) is the root cause class: the rendition engine fails to enforce adequate bounds on the computational cost of attacker-controlled filter specs, allowing crafted inputs to drive unbounded CPU or memory consumption during server-side image transformation. This is a class of algorithmic complexity attack rather than a memory safety or injection issue.
RemediationAI
Upgrade to Wagtail 7.0.8, 7.3.3, or 7.4.2 according to your active release branch; these versions are confirmed by the vendor advisory at https://github.com/wagtail/wagtail/security/advisories/GHSA-f2p5-j6fg-5cxf as containing the fix. If an immediate upgrade is not feasible, restrict the Wagtail admin interface to a minimum set of trusted, audited accounts and remove any unnecessary admin privileges - this directly eliminates the attacker prerequisite. Additionally, placing the admin interface behind network-level access controls (IP allowlist, VPN requirement) reduces exposure to credential theft scenarios. Rate-limiting requests to image rendition endpoints at the reverse proxy or WAF layer can reduce the feasibility of sustained abuse without disrupting normal editorial workflows. None of these workarounds address the underlying resource consumption flaw; patching is the definitive remediation.
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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