CVE-2026-44966

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 56% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Velocity.js is a JavaScript implementation of the Apache Velocity template engine. In 2.1.5 and earlier, a prototype pollution vulnerability was discovered in velocityjs. This issue occurs during the processing of #set directives in Velocity templates. If an application renders a template controlled by an attacker, it is possible to modify Object.prototype, potentially leading to Denial of Service (DoS) or Remote Code Execution (RCE) depending on the server environment.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Sep 11, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Prototype Pollution in #set path assignment · Advisory · shepherdwind/velocity.js · GitHub

https://github.com/shepherdwind/velocity.js/security/advisories/GHSA-j658-c2gf-x6pq

Vendor Advisories for CVE-2026-44966(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
npmvelocityjs—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
velocityjs———

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 39× 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.

Showing the most recent 100 of 274 total refreshes for this CVE.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 09:36 UTCEG score recompute
  3. 2026-09-14 09:36 UTCGHSA enrichment
  4. 2026-09-13 16:47 UTCEPSS rescore
  5. 2026-09-12 15:01 UTCEPSS rescore
  6. 2026-09-11 20:10 UTCOSV refresh
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-11 09:37 UTCEPSS rescore
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-08 22:00 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-04 05:06 UTCEPSS rescore
  14. 2026-09-02 14:12 UTCEPSS rescore
  15. 2026-09-01 13:54 UTCEPSS rescore
  16. 2026-08-30 19:17 UTCEPSS rescore
  17. 2026-08-30 01:22 UTCEPSS rescore
  18. 2026-08-28 21:41 UTCEPSS rescore
  19. 2026-08-27 14:25 UTCEPSS rescore
  20. 2026-08-26 14:46 UTCEPSS rescore
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-23 23:59 UTCGHSA enrichment
  23. 2026-08-23 19:52 UTCGHSA enrichment
  24. 2026-08-23 15:56 UTCEG score recompute
  25. 2026-08-23 15:56 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 00:19 UTCEPSS rescore
  2. 2026-08-22 01:15 UTCEG score recompute
  3. 2026-08-22 01:15 UTCGHSA enrichment
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-21 21:20 UTCEG score recompute
  6. 2026-08-21 21:20 UTCGHSA enrichment
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-20 22:41 UTCGHSA enrichment
  9. 2026-08-20 17:58 UTCEG score recompute
  10. 2026-08-20 17:58 UTCGHSA enrichment
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 13:26 UTCGHSA enrichment
  15. 2026-08-17 09:30 UTCGHSA enrichment
  16. 2026-08-16 16:29 UTCEG score recompute
  17. 2026-08-16 16:29 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 10:51 UTCGHSA enrichment
  20. 2026-08-16 06:56 UTCGHSA enrichment
  21. 2026-08-16 03:02 UTCEG score recompute
  22. 2026-08-16 03:02 UTCGHSA enrichment
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 01:48 UTCEG score recompute
  25. 2026-08-15 01:48 UTCGHSA enrichment
  26. 2026-08-15 01:30 UTCEPSS rescore
  27. 2026-08-14 21:53 UTCGHSA enrichment
  28. 2026-08-14 17:59 UTCGHSA enrichment
  29. 2026-08-14 13:24 UTCGHSA enrichment
  30. 2026-08-14 09:29 UTCGHSA enrichment
  31. 2026-08-14 05:35 UTCGHSA enrichment
  32. 2026-08-14 01:40 UTCEG score recompute
  33. 2026-08-14 01:40 UTCGHSA enrichment
  34. 2026-08-13 22:00 UTCEPSS rescore
  35. 2026-08-13 09:52 UTCGHSA enrichment
  36. 2026-08-13 05:54 UTCGHSA enrichment
  37. 2026-08-13 01:40 UTCGHSA enrichment
  38. 2026-08-12 21:45 UTCGHSA enrichment
  39. 2026-08-12 17:50 UTCGHSA enrichment
  40. 2026-08-12 13:56 UTCEG score recompute
  41. 2026-08-12 13:56 UTCGHSA enrichment
  42. 2026-08-12 13:51 UTCEPSS rescore
  43. 2026-08-12 09:39 UTCGHSA enrichment
  44. 2026-08-12 02:27 UTCGHSA enrichment
  45. 2026-08-11 22:28 UTCGHSA enrichment
  46. 2026-08-11 18:33 UTCEG score recompute
  47. 2026-08-11 18:33 UTCGHSA enrichment
  48. 2026-08-11 13:39 UTCGHSA enrichment
  49. 2026-08-11 08:09 UTCGHSA enrichment
  50. 2026-08-11 04:13 UTCGHSA enrichment
  51. 2026-08-11 00:19 UTCEG score recompute
  52. 2026-08-11 00:19 UTCGHSA enrichment
  53. 2026-08-11 00:00 UTCEPSS rescore
  54. 2026-08-10 14:18 UTCGHSA enrichment
  55. 2026-08-10 10:23 UTCGHSA enrichment
  56. 2026-08-10 06:28 UTCGHSA enrichment
  57. 2026-08-10 02:33 UTCGHSA enrichment
  58. 2026-08-09 22:38 UTCGHSA enrichment
  59. 2026-08-09 18:43 UTCGHSA enrichment
  60. 2026-08-09 14:48 UTCEG score recompute
  61. 2026-08-09 14:48 UTCGHSA enrichment
  62. 2026-08-09 13:46 UTCEPSS rescore
  63. 2026-08-09 10:54 UTCGHSA enrichment
  64. 2026-08-09 06:59 UTCGHSA enrichment
  65. 2026-08-09 03:04 UTCGHSA enrichment
  66. 2026-08-08 23:09 UTCEG score recompute
  67. 2026-08-08 23:09 UTCGHSA enrichment
  68. 2026-08-08 16:37 UTCEPSS rescore
  69. 2026-08-08 11:54 UTCGHSA enrichment
  70. 2026-08-08 08:00 UTCGHSA enrichment
  71. 2026-08-08 04:05 UTCGHSA enrichment
  72. 2026-08-08 00:11 UTCGHSA enrichment
  73. 2026-08-07 20:16 UTCEG score recompute
  74. 2026-08-07 20:16 UTCGHSA enrichment
  75. 2026-08-07 16:21 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-44966?
CVE-2026-44966 is a critical vulnerability published on May 26, 2026. Velocity.js is a JavaScript implementation of the Apache Velocity template engine. In 2.1.5 and earlier, a prototype pollution vulnerability was discovered in velocityjs. This issue occurs during the processing of #set directives in Velocity templates. If an application renders a template…
When was CVE-2026-44966 disclosed?
CVE-2026-44966 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44966 actively exploited?
CVE-2026-44966 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.8% of all scored CVEs.
What is the CVSS score of CVE-2026-44966?
CVE-2026-44966 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-44966?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44966, 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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