CVE-2026-100676

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-09-26. A secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.2Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

January, the media proxy/embed service of stoatchat (stoatchat/stoatchat), before version 0.15.5 improperly resolves SVG 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.

CVSS v3
8.2
EG Score
8.2HIGHhigh confidence
EG Risk
68
EG Risk 68/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
31st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 26, 2026

Last Modified

September 28, 2026

Advisory Details (2)

Auto-updated Sep 26, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic🟡 PoC Available

stoatchat before 0.15.5 Local Filesystem Read via SVG | Advisories | VulnCheck

https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-local-filesystem-read-via-svg
github Patch Available🟡 PoC Available

Crafted SVG files result in local filesystem reads · Advisory · stoatchat/stoatchat · GitHub

https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qv38-hwhv-jm49

Vendor Advisories for CVE-2026-100676(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 31× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 10:51 UTCGHSA enrichment
  2. 2026-10-03 22:26 UTCEG score recompute
  3. 2026-10-03 22:25 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 09:58 UTCGHSA enrichment
  6. 2026-10-02 21:27 UTCEG score recompute
  7. 2026-10-02 21:27 UTCGHSA enrichment
  8. 2026-10-02 08:56 UTCGHSA enrichment
  9. 2026-10-01 20:30 UTCEG score recompute
  10. 2026-10-01 20:30 UTCGHSA enrichment
  11. 2026-10-01 19:49 UTCEPSS rescore
  12. 2026-10-01 07:52 UTCGHSA enrichment
  13. 2026-09-30 19:26 UTCEG score recompute
  14. 2026-09-30 19:26 UTCGHSA enrichment
  15. 2026-09-30 15:02 UTCEPSS rescore
  16. 2026-09-30 07:00 UTCGHSA enrichment
  17. 2026-09-29 18:34 UTCEG score recompute
  18. 2026-09-29 18:33 UTCGHSA enrichment
  19. 2026-09-29 15:20 UTCEPSS rescore
  20. 2026-09-29 06:05 UTCEG score recompute
  21. 2026-09-29 06:05 UTCGHSA enrichment
  22. 2026-09-28 17:39 UTCEG score recompute
  23. 2026-09-28 17:39 UTCGHSA enrichment
  24. 2026-09-28 16:43 UTCEG score recompute
  25. 2026-09-28 16:43 UTCGHSA enrichment
Show 11 more
  1. 2026-09-28 16:16 UTCEG score recompute
  2. 2026-09-28 16:16 UTCGHSA enrichment
  3. 2026-09-28 13:50 UTCEPSS rescore
  4. 2026-09-28 03:50 UTCGHSA enrichment
  5. 2026-09-27 15:24 UTCEG score recompute
  6. 2026-09-27 15:24 UTCGHSA enrichment
  7. 2026-09-27 02:59 UTCEG score recompute
  8. 2026-09-27 02:59 UTCGHSA enrichment
  9. 2026-09-26 14:33 UTCEG score recompute
  10. 2026-09-26 13:37 UTCEG score recompute
  11. 2026-09-26 13:30 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-100676?
CVE-2026-100676 is a high vulnerability published on September 26, 2026. 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…
When was CVE-2026-100676 disclosed?
CVE-2026-100676 was first published on September 26, 2026, with the most recent update on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100676 actively exploited?
CVE-2026-100676 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100676?
CVE-2026-100676 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100676?
A fix for CVE-2026-100676 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-100676 are linked in the Vendor Advisories panel on this page.

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