CVE-2026-14574

MEDIUMNVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-05. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In Eclipse Theia versions 0.7.0 and up until including 1.73.1, the PreferenceUtils.merge function in @theia/core recursively merges preference values without rejecting prototype-related keys (__proto__, constructor, prototype). Because this function is invoked by PreferenceServiceImpl.doResolve for every preference resolution across scopes (default, user, workspace, folder), a crafted preference value in a workspace settings file (.theia/settings.json or .vscode/settings.json) can pollute Object.prototype when the user opens the workspace, potentially altering application logic across the Theia process.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 7, 2026

Advisory Details (2)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

[Eclipse Theia] Prototype Pollution in @theia/core PreferenceService preference merge (#157) · Issues · Eclipse Projects Security / cve-assignment · GitLab

https://gitlab.eclipse.org/security/cve-assignment/-/work_items/157
generic

[Eclipse Theia] Prototype Pollution in @theia/core PreferenceService preference merge (#567) · Issues · Eclipse Projects Security / vulnerability-reports · GitLab

https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/567

Vendor Advisories for CVE-2026-14574(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 19× in last 7d / 48× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 20:22 UTCGHSA enrichment
  3. 2026-08-19 20:05 UTCEG score recompute
  4. 2026-08-19 20:05 UTCGHSA enrichment
  5. 2026-08-19 17:03 UTCEPSS rescore
  6. 2026-08-18 19:48 UTCEG score recompute
  7. 2026-08-18 19:48 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 19:32 UTCEG score recompute
  10. 2026-08-17 19:32 UTCGHSA enrichment
  11. 2026-08-16 18:50 UTCEG score recompute
  12. 2026-08-16 18:50 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 02:14 UTCEPSS rescore
  15. 2026-08-15 18:29 UTCEG score recompute
  16. 2026-08-15 18:29 UTCGHSA enrichment
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-14 18:12 UTCEG score recompute
  19. 2026-08-14 18:12 UTCGHSA enrichment
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-13 17:55 UTCGHSA enrichment
  22. 2026-08-12 17:38 UTCEG score recompute
  23. 2026-08-12 17:38 UTCGHSA enrichment
  24. 2026-08-12 13:50 UTCEPSS rescore
  25. 2026-08-11 17:22 UTCEG score recompute
Show 23 more
  1. 2026-08-11 17:22 UTCGHSA enrichment
  2. 2026-08-11 13:42 UTCEPSS rescore
  3. 2026-08-10 23:59 UTCEPSS rescore
  4. 2026-08-10 16:55 UTCGHSA enrichment
  5. 2026-08-09 16:38 UTCEG score recompute
  6. 2026-08-09 16:38 UTCGHSA enrichment
  7. 2026-08-09 13:46 UTCEPSS rescore
  8. 2026-08-08 16:37 UTCEPSS rescore
  9. 2026-08-08 16:22 UTCEG score recompute▲ 0.80
  10. 2026-08-08 16:22 UTCGHSA enrichment
  11. 2026-08-07 16:07 UTCNVD updateCVSS v3 → 6.5
  12. 2026-08-07 16:05 UTCGHSA enrichment
  13. 2026-08-06 15:49 UTCGHSA enrichment
  14. 2026-08-06 14:46 UTCEG score recompute
  15. 2026-08-06 14:46 UTCGHSA enrichment
  16. 2026-08-06 13:46 UTCEPSS rescore
  17. 2026-08-05 14:26 UTCEG score recompute
  18. 2026-08-05 14:26 UTCGHSA enrichment
  19. 2026-08-05 13:47 UTCEG score recompute
  20. 2026-08-05 13:47 UTCGHSA enrichment
  21. 2026-08-05 11:27 UTCEG score recompute
  22. 2026-08-05 11:07 UTCEG score recompute
  23. 2026-08-05 11:05 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-14574?
CVE-2026-14574 is a medium vulnerability published on August 5, 2026. In Eclipse Theia versions 0.7.0 and up until including 1.73.1, the PreferenceUtils.merge function in @theia/core recursively merges preference values without rejecting prototype-related keys (proto, constructor, prototype). Because this function is invoked by PreferenceServiceImpl.doResolve for…
When was CVE-2026-14574 disclosed?
CVE-2026-14574 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-14574 actively exploited?
CVE-2026-14574 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 79.2% of all scored CVEs.
What is the CVSS score of CVE-2026-14574?
CVE-2026-14574 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-14574?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-14574, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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