---
id: CVE-2026-100676
title: >-
  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
summary: >-
  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…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cwe:
  - CWE-693
vendor: stoatchat
product: stoatchat
affected:
  - stoatchat < 0.15.5
published: '2026-09-26'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T14:16:51.577'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100676'
references:
  - url: >-
      https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-local-filesystem-read-via-svg
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-26T13:33:20.910Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.