CVE-2026-18675

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (44th 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
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The dataplane token validator in kuma-cp performs an unchecked Go type assertion on the JWT kid header. A token whose kid is a JSON number decodes as a float64 and triggers a runtime panic before any signature, claims, or authorization check runs.

The panic terminates the entire kuma-cp process, HTTP API, the health and readiness endpoints, and xDS. Unauthenticated access to the dataplane gRPC server can trigger the crash with a malformed token

A single request is a transient interruption; sustaining an outage requires repeated requests.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100CISA 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
Severity53% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (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 12, 2026

Last Modified

August 31, 2026

Advisory Details (9)

Auto-updated Aug 12, 2026
Patch available. Sources: github_pr.
generic

Kong Mesh changelog - Kong Mesh | Kong Docs

https://developer.konghq.com/mesh/changelog/
github_pr Patch Available

fix(tokens): reject a non-string kid header and recover from dp-server handler panics (backport of #17465)

Patch available: kumahq/kuma v2.7.29 (PR #17472 merged 2026-07-17)

https://github.com/kumahq/kuma/pull/17472
github_pr Patch Available

fix(tokens): reject a non-string kid header and recover from dp-server handler panics (backport of #17465)

Patch available: kumahq/kuma 2.9.19 (PR #17470 merged 2026-07-17)

https://github.com/kumahq/kuma/pull/17470
github_pr Patch Available

fix(tokens): reject a non-string kid header and recover from dp-server handler panics (backport of #17465)

Patch available: kumahq/kuma v2.11.18 (PR #17469 merged 2026-07-17)

https://github.com/kumahq/kuma/pull/17469
github_pr Patch Available

fix(tokens): reject a non-string kid header and recover from dp-server handler panics (backport of #17465)

Patch available: kumahq/kuma v2.12.14 (PR #17471 merged 2026-07-17)

https://github.com/kumahq/kuma/pull/17471
github_pr Patch Available

fix(tokens): reject a non-string kid header and recover from dp-server handler panics (backport of #17465)

Patch available: kumahq/kuma v2.13.10 (PR #17467 merged 2026-07-17)

https://github.com/kumahq/kuma/pull/17467
github_pr Patch Available

fix(tokens): reject a non-string kid header and recover from dp-server handler panics (backport of #17465)

Patch available: kumahq/kuma v2.14.2 (PR #17468 merged 2026-07-17)

https://github.com/kumahq/kuma/pull/17468
github_pr

fix(tokens): reject a non-string kid header and recover from dp-server handler panics

Fix merged in kumahq/kuma PR #17465 on 2026-07-17 — awaiting tagged release

https://github.com/kumahq/kuma/pull/17465
github Patch Available

Kuma control-plane denial of service via a malformed xDS dataplane token with a non-string JWT kid · Advisory · kumahq/kuma · GitHub

https://github.com/kumahq/kuma/security/advisories/GHSA-5mxq-7xq4-3vx8

Vendor Advisories for CVE-2026-18675(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 66× 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 134 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18675?
CVE-2026-18675 is a medium vulnerability published on August 12, 2026. The dataplane token validator in kuma-cp performs an unchecked Go type assertion on the JWT kid header. A token whose kid is a JSON number decodes as a float64 and triggers a runtime panic before any signature, claims, or authorization check runs. The panic terminates the entire kuma-cp process,…
When was CVE-2026-18675 disclosed?
CVE-2026-18675 was first published on August 12, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18675 actively exploited?
CVE-2026-18675 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18675?
CVE-2026-18675 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18675?
A fix for CVE-2026-18675 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18675 are linked in the Vendor Advisories panel on this page.

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