CVE-2026-19505

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-19. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 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: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Improper cryptographic signature verification in jst_functions.c in RDK-B WebUI rdkb-2025q4-kirkstone.04.10.26 allows a remote attacker to bypass authentication and obtain administrative access via a forged JWT containing an invalid RSA signature.

CVSS v3
9.8
EG Score
9.8(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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

August 19, 2026

Last Modified

September 3, 2026

Advisory Details (2)

Auto-updated Sep 17, 2026
No patch confirmed yet.
generic

RDK Documentation Portal | Documentation | WebUI - RDK Documentation Portal | Documentation

https://developer.rdkcentral.com/documentation/documentation/rdk_broadband_documentation/components/webui/
generic

[ENG] Multiple vulnerabilities in RDK-B WebUI – KN White Hats

https://whitehats.pwr.edu.pl//blog/2026-08-19-multiple-vulnerabilities-in-rdkb/

Vendor Advisories for CVE-2026-19505(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 49× in last 7d / 176× 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 179 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-19505?
CVE-2026-19505 is a critical vulnerability published on August 19, 2026. Improper cryptographic signature verification in jst_functions.c in RDK-B WebUI rdkb-2025q4-kirkstone.04.10.26 allows a remote attacker to bypass authentication and obtain administrative access via a forged JWT containing an invalid RSA signature.
When was CVE-2026-19505 disclosed?
CVE-2026-19505 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19505 actively exploited?
CVE-2026-19505 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.7% of all scored CVEs.
What is the CVSS score of CVE-2026-19505?
CVE-2026-19505 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-19505?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19505, 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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