{"id":"CVE-2026-100676","published":"2026-09-26T14:16:51.577","lastModified":"2026-09-28T17:17:44.810","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.","cvssScore":8.2,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","cwes":["CWE-693"],"vendors":[],"products":[],"references":[{"url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49","tags":[]},{"url":"https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-local-filesystem-read-via-svg","tags":[]},{"url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49","tags":[]}],"exploitRefs":[{"url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49","tags":[]},{"url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49","tags":[]}],"hasPoc":true,"ai":null}