stoatchat up to 0.15.4 Media Proxy denial of service

Summaryinfo

A vulnerability was found in stoatchat up to 0.15.4 and classified as critical. This impacts an unknown function of the component Media Proxy. The manipulation results in denial of service. This vulnerability is cataloged as CVE-2026-100676. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in stoatchat up to 0.15.4. It has been classified as critical. Affected is an unknown code of the component Media Proxy. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

January, the media proxy/embed service of stoatchat (stoatchat/stoatchat), before version 0.15.5 improperly resolves SVG <image href> values as local filesystem paths when a fetched resource is served as image/svg+xml. An unauthenticated remote attacker who causes the service to proxy an attacker-hosted SVG (e.g. via the /proxy endpoint) can determine whether local files exist through observable response-time differences, and can cause supported local image files to be disclosed after re-encoding. Because each referenced file is read in full with no effective limit on the number or total volume of reads, a single request can also generate an unbounded amount of local filesystem I/O and memory pressure (the published proof of concept drives about 4.34 GB of reads), leading to denial of service. The issue is fixed in 0.15.5.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-100676 since 09/26/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 0.15.5 eliminates this vulnerability.

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Productinfo

Type

• Chat Software

Name

• stoatchat

Version

• 0.15.0
• 0.15.1
• 0.15.2
• 0.15.3
• 0.15.4

Website

• Product: https://github.com/stoatchat/stoatchat/

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