CVE-2026-103087

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (22nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this weekElevated
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Uncontrolled recursion in the Gosub browser engine (gosub-engine) through 0.1.0 and main before commit 46868b3 allows a remote attacker to cause a Denial of Service (stack exhaustion and application crash) via an SVG document containing an excessive number of deeply nested elements. Because the engine does not limit the nesting depth of processed SVG nodes, rendering such a document overflows the thread stack and terminates the application. The malicious SVG can be embedded through the SRC attribute of an IMG element, and thus exploitation only requires the victim to visit an attacker-controlled web page.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
48
EG Risk 48/100CISA 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
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (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 30, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Sep 30, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github.
github_pr Patch Available

Fixes ghsa c762 mxfh vwvp

Patch available: gosub-io/gosub-engine nightly (PR #1229 merged 2026-09-25)

https://github.com/gosub-io/gosub-engine/pull/1229
github Patch Available🟡 PoC Available

Denial of Service via Excessive XML Element Nesting · Advisory · gosub-io/gosub-engine · GitHub

https://github.com/gosub-io/gosub-engine/security/advisories/GHSA-c762-mxfh-vwvp

Vendor Advisories for CVE-2026-103087(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 23× in last 7d / 23× 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 08:53 UTCGHSA enrichment
  2. 2026-10-03 20:48 UTCEG score recompute
  3. 2026-10-03 20:48 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 08:45 UTCGHSA enrichment
  6. 2026-10-02 20:39 UTCEG score recompute
  7. 2026-10-02 20:39 UTCGHSA enrichment
  8. 2026-10-02 08:35 UTCGHSA enrichment
  9. 2026-10-01 20:31 UTCEG score recompute
  10. 2026-10-01 20:31 UTCGHSA enrichment
  11. 2026-10-01 19:49 UTCEPSS rescore
  12. 2026-10-01 08:27 UTCGHSA enrichment
  13. 2026-09-30 20:23 UTCEG score recompute
  14. 2026-09-30 20:23 UTCGHSA enrichment
  15. 2026-09-30 19:26 UTCEG score recompute
  16. 2026-09-30 19:26 UTCGHSA enrichment
  17. 2026-09-30 17:45 UTCEG score recompute
  18. 2026-09-30 17:45 UTCGHSA enrichment
  19. 2026-09-30 15:02 UTCEPSS rescore
  20. 2026-09-30 14:36 UTCGHSA enrichment
  21. 2026-09-30 02:30 UTCEG score recompute
  22. 2026-09-30 01:21 UTCEG score recompute
  23. 2026-09-30 01:19 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-103087?
CVE-2026-103087 is a high vulnerability published on September 30, 2026. Uncontrolled recursion in the Gosub browser engine (gosub-engine) through 0.1.0 and main before commit 46868b3 allows a remote attacker to cause a Denial of Service (stack exhaustion and application crash) via an SVG document containing an excessive number of deeply nested elements. Because the…
When was CVE-2026-103087 disclosed?
CVE-2026-103087 was first published on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-103087 actively exploited?
CVE-2026-103087 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-103087?
CVE-2026-103087 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-103087?
A fix for CVE-2026-103087 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-103087 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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