January, the media proxy/embed service of stoatchat (stoatchat/stoatchat), before version 0.15.5 improperly resolves SVG <image href> values as… (CVE-2026-100676)
January, the media proxy/embed service of stoatchat, before version 0.15.5, improperly resolves SVG <image href> values as local filesystem paths when serving image/svg+xml content. This allows an unauthenticated remote attacker to probe for local file existence via timing differences and disclose local image files after re-encoding. The vulnerability can also cause unbounded local filesystem I/O and memory pressure, leading to denial of service. The issue is fixed in version 0.15.5.
AI Analysis
Technical Summary
The vulnerability in January (stoatchat/stoatchat) before version 0.15.5 involves improper resolution of SVG <image href> attributes as local filesystem paths when proxying SVG images. An attacker can supply a crafted SVG via the proxy endpoint to cause the service to read local files fully, enabling file existence detection through response timing and disclosure of local image files after re-encoding. The lack of limits on the number or size of reads can cause excessive filesystem I/O and memory consumption, resulting in denial of service. The flaw is addressed in version 0.15.5.
Potential Impact
An unauthenticated remote attacker can determine the existence of local files and disclose local image files by exploiting the SVG image href resolution flaw. Additionally, the attacker can cause denial of service by triggering unbounded filesystem reads and memory usage. The confidentiality impact is limited to local image files, integrity is not affected, but availability can be severely impacted due to resource exhaustion.
Mitigation Recommendations
Upgrade to January version 0.15.5 or later, where this vulnerability is fixed. No other mitigation is required as the issue is resolved in the official patch.
January, the media proxy/embed service of stoatchat (stoatchat/stoatchat), before version 0.15.5 improperly resolves SVG <image href> values as… (CVE-2026-100676)
Description
January, the media proxy/embed service of stoatchat, before version 0.15.5, improperly resolves SVG <image href> values as local filesystem paths when serving image/svg+xml content. This allows an unauthenticated remote attacker to probe for local file existence via timing differences and disclose local image files after re-encoding. The vulnerability can also cause unbounded local filesystem I/O and memory pressure, leading to denial of service. The issue is fixed in version 0.15.5.
CVSS v3.1
Score 8.2high
Affected software
pkg:github/stoatchat/stoatchatRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in January (stoatchat/stoatchat) before version 0.15.5 involves improper resolution of SVG <image href> attributes as local filesystem paths when proxying SVG images. An attacker can supply a crafted SVG via the proxy endpoint to cause the service to read local files fully, enabling file existence detection through response timing and disclosure of local image files after re-encoding. The lack of limits on the number or size of reads can cause excessive filesystem I/O and memory consumption, resulting in denial of service. The flaw is addressed in version 0.15.5.
Potential Impact
An unauthenticated remote attacker can determine the existence of local files and disclose local image files by exploiting the SVG image href resolution flaw. Additionally, the attacker can cause denial of service by triggering unbounded filesystem reads and memory usage. The confidentiality impact is limited to local image files, integrity is not affected, but availability can be severely impacted due to resource exhaustion.
Mitigation Recommendations
Upgrade to January version 0.15.5 or later, where this vulnerability is fixed. No other mitigation is required as the issue is resolved in the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-4h96-wm2q-h7fw
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-100676"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6ab89bdef7a7c54106942046
Added to database: 09/27/2026, 04:30:22 UTC
Last enriched: 09/27/2026, 04:42:39 UTC
Last updated: 09/28/2026, 01:47:40 UTC
Views: 17
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