CVE-2026-4800

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 2.8%, top 15% of all CVEs by exploit prediction. 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, nvd
Trending — Patch released this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Impact:

The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink.

When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time.

Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function().

Patches:

Users should upgrade to version 4.18.0.

Workarounds:

Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.

CVSS v3
9.8
EG Score
9.8(medium)
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
Severity98% × 45%
Exploitation3% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
85%
KEV
Not listed

Published

March 31, 2026

Last Modified

August 25, 2026

Advisory Details (11)

Auto-updated Aug 25, 2026
Patch available. Sources: redhat, github, github_commit.
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:11469
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:11454
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:10713
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:10710
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10175
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10131
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHBA-2026:21387
github_commit Patch Available

commit 3469357cff39 (lodash/lodash)

Patch available: lodash/lodash 4.18.0 (contains commit 3469357cff39)

https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c
github Patch Available

Command Injection in lodash · CVE-2021-23337 · GitHub Advisory Database · GitHub

https://github.com/advisories/GHSA-35jh-r3h4-6jhm
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:11470

Vendor Advisories for CVE-2026-4800(20)

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

Patch Availability(29)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenshift4/ose-console:17864777602026-08-20redhat
redhatopenshift4/ose-console-rhel9:17852785692026-08-05redhat
redhatopenshift4/ose-console-rhel9:17846348772026-07-29redhat
redhatopenshift4/ose-console-rhel9:17841480702026-07-21redhat
redhatrhmtc/openshift-migration-ui-rhel8:17836905322026-07-20redhat
redhatautomation-gateway-0:2.5.20260715-1.el9ap2026-07-20redhat
redhatodf4/rook-ceph-rhel9-operator:17836853752026-07-20redhat
redhatodf4/rook-ceph-rhel9-operator:17836775332026-07-20redhat
redhatopenshift4/ose-networking-console-plugin-rhel9:17829340802026-07-16redhat
redhatodf4/rook-ceph-rhel9-operator:17836692192026-07-16redhat
redhatrhem/flightctl-ui-rhel10:17841945742026-07-16redhat
redhatrhem/flightctl-ui-rhel9:17841277362026-07-15redhat
redhatopenshift4/ose-console-rhel9:17835023382026-07-14redhat
redhatopenshift4/nmstate-console-plugin-rhel9:17822697942026-07-09redhat
redhatrhem/flightctl-ui-rhel9:17835024382026-07-08redhat
redhatlodash2026-07-02redhat
redhatcluster-observability-operator/troubleshooting-panel-console-plugin-pf6-rhel9:17828399962026-07-01redhat
redhatopenshift4/ose-console-rhel9:17822243902026-06-30redhat
redhatrhoai/odh-mod-arch-model-registry-rhel9:17804671472026-06-10redhat
redhatautomation-platform-ui-0:2.6.9-1.el9ap2026-06-09redhat
redhatcockpit-image-builder-0:94.3-1.el10_22026-06-08redhat
redhatopenshift4/nmstate-console-plugin-rhel9:17798749672026-06-03redhat
redhatopenshift4/ose-networking-console-plugin-rhel9:17792563222026-05-27redhat
redhatopenshift4/nmstate-console-plugin-rhel9:17792499202026-05-27redhat
redhatcockpit-0:356.1-1.el9_82026-05-27redhat
redhatopenshift-gitops-1/console-plugin-rhel8:17791155452026-05-26redhat
redhatopenshift-gitops-1/console-plugin-rhel8:17792105302026-05-26redhat
redhatcryostat/cryostat-rhel9:4.2.0-92026-05-26redhat
redhatopenshift4/ose-networking-console-plugin-rhel9:17785171092026-05-20redhat

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

(10 across 6 ecosystems)
npm(5)
PackageVulnerable rangeFixed inDependents
lodash—4.17.21—
lodash-amd—4.18.0—
lodash-es—4.17.21—
lodash-template———
lodash.template———
Debian:11(1)
PackageVulnerable rangeFixed inDependents
node-lodash4.17.21+dfsg+~cs8.31.173-14.17.21+dfsg+~cs8.31.173-1+deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-lodash4.17.21+dfsg+~cs8.31.198.20210220-10 ... 4.18.1+dfsg1-1 (7 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-lodash4.17.21+dfsg+~cs8.31.198.20210220-10 ... 4.18.1+dfsg1-1 (8 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-lodash4.17.21+dfsg+~cs8.31.198.20210220-10, 4.17.21+dfsg+~cs8.31.198.20210220-9, 4.17.23+dfsg-14.18.1+dfsg-1—
RubyGems(1)
PackageVulnerable rangeFixed inDependents
lodash-rails0.10.0 ... 4.6.1 (55 versions)4.17.21—

Weakness Classification(1)

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

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 20× in last 7d / 110× 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 225 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCthrealwinky/CVE-2026-4800-POC
    First seen Apr 1, 2026
    Open source ↗

Frequently asked(5)

What is CVE-2026-4800?
CVE-2026-4800 is a critical vulnerability published on March 31, 2026. Impact: The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink. When an application passes…
When was CVE-2026-4800 disclosed?
CVE-2026-4800 was first published in the National Vulnerability Database on March 31, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4800 actively exploited?
CVE-2026-4800 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 14.9% of all scored CVEs.
What is the CVSS score of CVE-2026-4800?
CVE-2026-4800 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-4800?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4800, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-4800

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