{"id":"CVE-2026-100676","state":"PUBLISHED","title":"stoatchat before 0.15.5 Local Filesystem Read via SVG","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.","publishedAt":"2026-09-26T13:23:39.014Z","updatedAt":"2026-09-28T16:33:08.727Z","severity":{"score":8.8,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["stoatchat stoatchat"],"affected":[{"vendor":"stoatchat","product":"stoatchat","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.15.5","versionType":"semver"},{"version":"0.15.5","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49","https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-local-filesystem-read-via-svg"],"weaknesses":["CWE-693"],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/100xxx/CVE-2026-100676.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100676","state":"PUBLISHED","datePublished":"2026-09-26T13:23:39.014Z","dateUpdated":"2026-09-28T16:33:08.727Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-26T02:36:51.809Z"},"containers":{"cna":{"title":"stoatchat before 0.15.5 Local Filesystem Read via SVG","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"stoatchat","product":"stoatchat","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.15.5","versionType":"semver"},{"version":"0.15.5","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-qv38-hwhv-jm49)"},{"url":"https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-local-filesystem-read-via-svg","name":"VulnCheck Advisory: stoatchat before 0.15.5 Local Filesystem Read via SVG","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.8,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-693","lang":"en","description":"Protection Mechanism Failure","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-26T13:23:39.014Z"},"datePublic":"2026-09-11T00:00:00.000Z","credits":[{"lang":"en","value":"QuentinRa","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-28T16:32:41.399938Z","id":"CVE-2026-100676","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-28T16:33:08.727Z"}}]}}}