CVE-2026-100676

HIGHPre-NVD 8.28.2
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-87649 (ENISA EUVD) · GHSA-4h96-wm2q-h7fw (GitHub Security Advisories)Source: ENISA EUVD

8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.2Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — 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
8.2HIGHmedium confidence
EG Risk
68
EG Risk 68/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity82% × 45%
Impact severity (EG Severity): CVSS 8.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.2): severity, escalated by confirmed exploitation. This CVE's 8.2 is its impact severity (EG Severity), not escalated.

EG Severity
8.2 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

The CVE record names the fixed release. 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 26, 2026

Last Modified

September 28, 2026

Advisory Details (2)

Auto-updated Sep 26, 2026
Fix named in the CVE record. Sources: github.
Web page

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 advisoryMentions a patch (unverified)

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 9× in last 7d / 66× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  4. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-26 15:32 UTCEG score recompute
  9. 2026-10-26 15:32 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-25 15:58 UTCEG score recompute
  12. 2026-10-25 04:53 UTCEG score recompute
  13. 2026-10-25 04:52 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  14. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  15. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  16. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  17. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  18. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  19. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  20. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  21. 2026-10-18 05:11 UTCEG score recompute
  22. 2026-10-17 20:11 UTCEG score recompute
  23. 2026-10-17 20:11 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  24. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  25. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
Show 73 more
  1. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  2. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  4. 2026-10-12 16:41 UTCEG score recompute
  5. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  6. 2026-10-11 19:33 UTCEG score recompute
  7. 2026-10-11 19:33 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  8. 2026-10-11 18:29 UTCEG score recompute
  9. 2026-10-11 15:02 UTCEG score recompute
  10. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  11. 2026-10-11 07:07 UTCEG score recompute
  12. 2026-10-11 07:07 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  13. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  14. 2026-10-10 18:40 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  15. 2026-10-10 06:15 UTCEG score recompute
  16. 2026-10-10 06:15 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  17. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  18. 2026-10-09 17:46 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  19. 2026-10-09 05:20 UTCEG score recompute
  20. 2026-10-09 05:20 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  21. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  22. 2026-10-08 16:54 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  23. 2026-10-08 02:01 UTCEG score recompute
  24. 2026-10-08 02:01 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  25. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  26. 2026-10-07 13:35 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  27. 2026-10-07 01:01 UTCEG score recompute
  28. 2026-10-07 01:01 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  29. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  30. 2026-10-06 12:35 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  31. 2026-10-06 00:10 UTCEG score recompute
  32. 2026-10-06 00:10 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  33. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  34. 2026-10-05 11:44 UTCEG score recompute
  35. 2026-10-05 11:44 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  36. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  37. 2026-10-04 23:18 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  38. 2026-10-04 10:51 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  39. 2026-10-03 22:26 UTCEG score recompute
  40. 2026-10-03 22:25 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  41. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  42. 2026-10-03 09:58 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  43. 2026-10-02 21:27 UTCEG score recompute
  44. 2026-10-02 21:27 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  45. 2026-10-02 08:56 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  46. 2026-10-01 20:30 UTCEG score recompute
  47. 2026-10-01 20:30 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  48. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  49. 2026-10-01 07:52 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  50. 2026-09-30 19:26 UTCEG score recompute
  51. 2026-09-30 19:26 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  52. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  53. 2026-09-30 07:00 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  54. 2026-09-29 18:34 UTCEG score recompute
  55. 2026-09-29 18:33 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  56. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  57. 2026-09-29 06:05 UTCEG score recompute
  58. 2026-09-29 06:05 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  59. 2026-09-28 17:39 UTCEG score recompute
  60. 2026-09-28 17:39 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  61. 2026-09-28 16:43 UTCEG score recompute
  62. 2026-09-28 16:43 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  63. 2026-09-28 16:16 UTCEG score recompute
  64. 2026-09-28 16:16 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  65. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  66. 2026-09-28 03:50 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  67. 2026-09-27 15:24 UTCEG score recompute
  68. 2026-09-27 15:24 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  69. 2026-09-27 02:59 UTCEG score recompute
  70. 2026-09-27 02:59 UTCGHSA enrichmentGHSA-4h96-wm2q-h7fw · GitHub severity HIGH · GitHub CVSS 8.2
  71. 2026-09-26 14:33 UTCEG score recompute
  72. 2026-09-26 13:37 UTCEG score recomputeFirst assessed: 8.2 HIGH
  73. 2026-09-26 13:30 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-100676?
CVE-2026-100676 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-100676 was made public on September 11, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 26, 2026. EchelonGraph's copy of the record carries a last-modified date of September 28, 2026; the record at its source may have been updated since.
Is CVE-2026-100676 actively exploited?
CVE-2026-100676 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd 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?
The CVE record for CVE-2026-100676 names the fix: "The issue is fixed in 0.15.5." The vendor advisories EchelonGraph has for CVE-2026-100676 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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