CVE-2026-100676 Details
Description
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.
A vulnerability in the January media proxy service of Stoatchat, prior to version 0.15.5, allows for improper handling of SVG image references. When an SVG resource is fetched and served as image/svg+xml, the <image href> values are incorrectly resolved as local filesystem paths. This flaw enables an unauthenticated remote attacker to proxy an attacker-hosted SVG through the /proxy endpoint, potentially disclosing local image files after re-encoding them. The vulnerability can also be exploited to determine the existence of local files by measuring response time variations, as each referenced file is read in full without any effective limit on the number or volume of reads. This exploitation can generate excessive local filesystem I/O and memory usage, leading to a denial-of-service condition. The issue has been patched in version 0.15.5.
Users are advised to update Stoatchat to version 0.15.5 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 26, 2026CISA-ADP
Assessed Sep 28, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49 | [email protected] | AdvisoryExploitRemedyVendor |
| https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-local-filesystem-read-via-svg | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-693 | Protection Mechanism Failure | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| stoatchat January | <= 0.15.4 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 28, 2026 | CVE Modified | CISA-ADP |
| Sep 26, 2026 | New CVE Received | [email protected] |