CVE-2026-73647

MEDIUMPre-NVD 5.65.6—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (30th 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
Elevated
5.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.6Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.22.0, the public extend() utility in ui/src/utils/extend/extend.js recursively copied attacker-controlled object keys during extend(true, target, source) deep merges without rejecting an own __proto__ property. The merge could descend into the prototype object and write attacker-controlled properties to Object.prototype in the same JavaScript process. Applications that passed user-controlled or partially user-controlled objects to extend() could experience logic bypass, unsafe default-option injection, denial of service, or other application-specific impact when polluted properties were later consumed. This issue is fixed in version 2.22.0.

CVSS v3
5.6
EG Score
5.6MEDIUMmedium confidence
EG Risk
41
EG Risk 41/100CISA 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
Severity56% × 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
0.4%
EPSS %ILE
30th
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

August 13, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 13, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
githubMentions a patch (unverified)🟡 PoC Available

Prototype pollution in Quasar extend() utility · Advisory · quasarframework/quasar · GitHub

https://github.com/quasarframework/quasar/security/advisories/GHSA-3r53-75j5-3g7j
github_release Patch Available

quasar-v2.22.0

Patch available: quasarframework/quasar quasar-v2.22.0

https://github.com/quasarframework/quasar/releases/tag/quasar-v2.22.0
github_commit Patch Available

commit d0a95d95ab3c (quasarframework/quasar)

Patch available: quasarframework/quasar @quasar/icongenie-v6.1.1 (contains commit d0a95d95ab3c)

https://github.com/quasarframework/quasar/commit/d0a95d95ab3c29d13e1b8ba8c5e5025fd6ce35e7

Vendor Advisories for CVE-2026-73647(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
quasar—
  • every version up to 2.22.0: fixed in 2.22.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 42× 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. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 15:18 UTCEPSS rescore
  6. 2026-10-06 13:19 UTCEG score recompute
  7. 2026-10-05 17:43 UTCEPSS rescore
  8. 2026-10-04 23:22 UTCEPSS rescore
  9. 2026-10-03 19:47 UTCEG score recompute
  10. 2026-10-03 14:26 UTCEPSS rescore
  11. 2026-10-02 07:32 UTCEG score recompute
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-09-30 21:46 UTCEG score recompute
  14. 2026-09-29 15:24 UTCEPSS rescore
  15. 2026-09-29 08:36 UTCEG score recompute
  16. 2026-09-28 13:52 UTCEPSS rescore
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  18. 2026-09-27 13:48 UTCEPSS rescore
  19. 2026-09-27 09:43 UTCEG score recompute
  20. 2026-09-26 15:59 UTCEPSS rescore
  21. 2026-09-25 03:32 UTCEG score recompute
  22. 2026-09-23 20:59 UTCEG score recompute
  23. 2026-09-23 17:54 UTCEPSS rescore
  24. 2026-09-22 21:34 UTCEG score recompute
  25. 2026-09-21 22:08 UTCEG score recompute
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  1. 2026-09-21 21:09 UTCEPSS rescore
  2. 2026-09-20 22:42 UTCEG score recompute
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-19 23:16 UTCEG score recompute
  5. 2026-09-18 23:51 UTCEG score recompute
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 00:26 UTCEG score recompute
  8. 2026-09-16 23:59 UTCEG score recompute
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 20:14 UTCEG score recompute
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-13 19:13 UTCEG score recompute
  14. 2026-09-12 19:47 UTCEG score recompute
  15. 2026-09-12 15:02 UTCEPSS rescore
  16. 2026-09-11 20:21 UTCEG score recompute
  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-10 20:54 UTCEG score recompute
  19. 2026-09-10 09:35 UTCEPSS rescore
  20. 2026-09-09 04:56 UTCEG score recompute
  21. 2026-09-08 22:01 UTCEPSS rescore
  22. 2026-09-07 16:31 UTCEG score recompute
  23. 2026-09-06 13:48 UTCEPSS rescore
  24. 2026-09-06 10:51 UTCEG score recompute
  25. 2026-09-05 11:26 UTCEG score recompute
  26. 2026-09-04 12:00 UTCEG score recompute
  27. 2026-09-04 05:07 UTCEPSS rescore
  28. 2026-09-03 12:34 UTCEG score recompute
  29. 2026-09-02 14:12 UTCEPSS rescore
  30. 2026-09-02 13:07 UTCEG score recompute
  31. 2026-09-01 13:54 UTCEPSS rescore
  32. 2026-09-01 11:19 UTCEG score recompute
  33. 2026-09-01 04:40 UTCEPSS rescore
  34. 2026-09-01 04:40 UTCEPSS rescore
  35. 2026-08-31 11:38 UTCEG score recompute
  36. 2026-08-30 19:18 UTCEPSS rescore
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  38. 2026-08-30 10:39 UTCEG score recompute
  39. 2026-08-30 01:22 UTCEPSS rescore
  40. 2026-08-29 11:08 UTCEG score recompute
  41. 2026-08-28 21:42 UTCEPSS rescore
  42. 2026-08-28 11:31 UTCEG score recompute
  43. 2026-08-27 14:25 UTCEPSS rescore
  44. 2026-08-27 11:57 UTCEG score recompute
  45. 2026-08-26 14:47 UTCEPSS rescore
  46. 2026-08-26 12:31 UTCEG score recompute
  47. 2026-08-25 13:49 UTCEPSS rescore
  48. 2026-08-25 13:06 UTCEG score recompute
  49. 2026-08-24 13:39 UTCEG score recompute
  50. 2026-08-23 14:13 UTCEG score recompute
  51. 2026-08-23 00:19 UTCEPSS rescore
  52. 2026-08-22 14:48 UTCEG score recompute
  53. 2026-08-21 23:49 UTCEPSS rescore
  54. 2026-08-21 15:22 UTCEG score recompute
  55. 2026-08-20 22:56 UTCEPSS rescore
  56. 2026-08-20 15:56 UTCEG score recompute
  57. 2026-08-19 17:04 UTCEPSS rescore
  58. 2026-08-18 17:06 UTCEG score recompute
  59. 2026-08-18 13:49 UTCEPSS rescore
  60. 2026-08-18 13:49 UTCEPSS rescore
  61. 2026-08-17 17:03 UTCEG score recompute
  62. 2026-08-17 13:47 UTCEPSS rescore
  63. 2026-08-16 17:38 UTCEG score recompute
  64. 2026-08-16 14:56 UTCEPSS rescore
  65. 2026-08-16 14:56 UTCEPSS rescore
  66. 2026-08-16 02:15 UTCEPSS rescore
  67. 2026-08-15 18:11 UTCEG score recompute
  68. 2026-08-15 01:31 UTCEPSS rescore
  69. 2026-08-14 18:45 UTCEG score recompute
  70. 2026-08-13 19:19 UTCEG score recompute
  71. 2026-08-13 18:52 UTCEG score recompute
  72. 2026-08-13 18:18 UTCEG score recompute
  73. 2026-08-13 18:12 UTCEG score recompute
  74. 2026-08-13 18:11 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-73647?
CVE-2026-73647 is a medium vulnerability published on August 13, 2026. Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.22.0, the public extend() utility in ui/src/utils/extend/extend.js recursively copied attacker-controlled object keys during extend(true, target, source) deep merges without rejecting an own proto…
When was CVE-2026-73647 disclosed?
CVE-2026-73647 was first published on August 13, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73647 actively exploited?
CVE-2026-73647 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73647?
CVE-2026-73647 has a CVSS base score of 5.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73647?
A fix for CVE-2026-73647 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73647 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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