CVE-2026-42880

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 59% 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, secondary
Elevated
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.6Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From versions 3.2.0 to before 3.2.11 and 3.3.0 to before 3.3.9, there is a missing authorization and data-masking gap in Argo CD's ServerSideDiff endpoint that allows an attacker with read-only access to extract plaintext Kubernetes Secret data from etcd via the Kubernetes API server's Server-Side Apply dry-run mechanism. This issue has been patched in versions 3.2.11 and 3.3.9.

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
59(Track*)
EG Risk 59/100SSVC: 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
Severity96% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

May 7, 2026

Last Modified

September 7, 2026

Advisory Details (7)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: github, redhat.
redhat Patch Available
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42880.json
github Patch Available🟡 PoC Available

Kubernetes Secret Extraction via ArgoCD ServerSideDiff · Advisory · argoproj/argo-cd · GitHub

https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3
redhat

2467882 – (CVE-2026-42880) CVE-2026-42880 argoproj/argo-cd: Argo CD: Information disclosure of Kubernetes Secret data via Server-Side Apply dry-run mechanism

https://bugzilla.redhat.com/show_bug.cgi?id=2467882
redhat Patch Available

CVE-2026-42880 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-42880
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:20947
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:20943
redhat Patch Available
https://access.redhat.com/errata/RHBA-2026:12433

Vendor Advisories for CVE-2026-42880(3)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenshift-gitops-1/argocd-image-updater-rhel8:17792114122026-05-26redhat
redhatopenshift-gitops-1/gitops-rhel9-operator:17792846852026-05-26redhat
redhatopenshift-gitops-1/argocd-rhel9:17769427992026-04-30redhat

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

(3 across 1 ecosystem)
Go(3)
PackageVulnerable rangeFixed inDependents
github.com/argoproj/argo-cd———
github.com/argoproj/argo-cd/v2———
github.com/argoproj/argo-cd/v3—3.3.9—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 30× 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 296 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-42880?
CVE-2026-42880 is a critical vulnerability published on May 7, 2026. Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From versions 3.2.0 to before 3.2.11 and 3.3.0 to before 3.3.9, there is a missing authorization and data-masking gap in Argo CD's ServerSideDiff endpoint that allows an attacker with read-only access to extract plaintext…
When was CVE-2026-42880 disclosed?
CVE-2026-42880 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on September 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42880 actively exploited?
CVE-2026-42880 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 57.8% of all scored CVEs.
What is the CVSS score of CVE-2026-42880?
CVE-2026-42880 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-42880?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42880, 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-2026-42880

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