CVE-2026-19135

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-08-13. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

A JEXL expression sandbox bypass exists in multiple versions of OpenNMS Meridian and Horizon. A low-privileged authenticated user can submit a crafted expression to the Measurements REST API that escapes the sandbox and loads arbitrary Java classes on the server. This can potentially allow an attacker to gain access to confidential information and compromise integrity.

The solution is to upgrade to Meridian 2024.3.12, 2025.0.9 and Horizon 36.0.3 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

August 13, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Aug 13, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
github_pr

NMS-20051: Fix JEXL sandbox bypass

Fix merged in OpenNMS/opennms PR #8754 on 2026-08-06 — awaiting tagged release

https://github.com/OpenNMS/opennms/pull/8754

Vendor Advisories for CVE-2026-19135(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 17× in last 7d / 71× 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.

  1. 2026-09-19 04:25 UTCEG score recompute
  2. 2026-09-19 04:25 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 02:20 UTCEG score recompute
  5. 2026-09-18 02:20 UTCGHSA enrichment
  6. 2026-09-17 00:14 UTCEG score recompute
  7. 2026-09-17 00:14 UTCGHSA enrichment
  8. 2026-09-16 14:07 UTCEPSS rescore
  9. 2026-09-16 05:14 UTCEPSS rescore
  10. 2026-09-15 13:07 UTCEG score recompute
  11. 2026-09-15 13:07 UTCGHSA enrichment
  12. 2026-09-14 10:10 UTCEG score recompute
  13. 2026-09-14 10:10 UTCGHSA enrichment
  14. 2026-09-13 16:46 UTCEPSS rescore
  15. 2026-09-13 08:04 UTCEG score recompute
  16. 2026-09-13 08:04 UTCGHSA enrichment
  17. 2026-09-12 15:00 UTCEPSS rescore
  18. 2026-09-12 05:59 UTCEG score recompute
  19. 2026-09-12 05:58 UTCGHSA enrichment
  20. 2026-09-11 14:52 UTCEPSS rescore
  21. 2026-09-11 09:36 UTCEPSS rescore
  22. 2026-09-11 03:52 UTCEG score recompute
  23. 2026-09-11 03:52 UTCGHSA enrichment
  24. 2026-09-10 09:34 UTCEPSS rescore
  25. 2026-09-10 01:46 UTCEG score recompute
Show 70 more
  1. 2026-09-10 01:46 UTCGHSA enrichment
  2. 2026-09-08 22:00 UTCEPSS rescore
  3. 2026-09-08 20:06 UTCGHSA enrichment
  4. 2026-09-07 16:39 UTCEG score recompute
  5. 2026-09-07 16:39 UTCGHSA enrichment
  6. 2026-09-07 16:01 UTCEPSS rescore
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-06 05:45 UTCEG score recompute
  9. 2026-09-06 05:45 UTCGHSA enrichment
  10. 2026-09-05 03:39 UTCEG score recompute
  11. 2026-09-05 03:39 UTCGHSA enrichment
  12. 2026-09-04 05:06 UTCEPSS rescore
  13. 2026-09-04 01:33 UTCGHSA enrichment
  14. 2026-09-02 23:24 UTCGHSA enrichment
  15. 2026-09-01 15:15 UTCEG score recompute
  16. 2026-09-01 15:15 UTCGHSA enrichment
  17. 2026-09-01 13:53 UTCEPSS rescore
  18. 2026-08-31 12:37 UTCEG score recompute
  19. 2026-08-31 12:37 UTCGHSA enrichment
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 10:30 UTCEG score recompute
  22. 2026-08-30 10:30 UTCGHSA enrichment
  23. 2026-08-30 01:22 UTCEPSS rescore
  24. 2026-08-29 08:24 UTCEG score recompute
  25. 2026-08-29 08:24 UTCGHSA enrichment
  26. 2026-08-28 21:41 UTCEPSS rescore
  27. 2026-08-27 19:34 UTCEG score recompute
  28. 2026-08-27 19:34 UTCGHSA enrichment
  29. 2026-08-27 14:25 UTCEPSS rescore
  30. 2026-08-26 14:46 UTCEPSS rescore
  31. 2026-08-26 14:38 UTCEG score recompute
  32. 2026-08-26 14:38 UTCGHSA enrichment
  33. 2026-08-25 13:48 UTCEPSS rescore
  34. 2026-08-25 12:31 UTCEG score recompute
  35. 2026-08-25 12:31 UTCGHSA enrichment
  36. 2026-08-24 10:26 UTCEG score recompute
  37. 2026-08-24 10:26 UTCGHSA enrichment
  38. 2026-08-23 08:20 UTCEG score recompute
  39. 2026-08-23 08:20 UTCGHSA enrichment
  40. 2026-08-23 00:19 UTCEPSS rescore
  41. 2026-08-22 06:14 UTCEG score recompute
  42. 2026-08-22 06:14 UTCGHSA enrichment
  43. 2026-08-21 23:49 UTCEPSS rescore
  44. 2026-08-21 04:04 UTCEG score recompute
  45. 2026-08-21 04:04 UTCGHSA enrichment
  46. 2026-08-20 22:55 UTCEPSS rescore
  47. 2026-08-20 01:59 UTCEG score recompute
  48. 2026-08-20 01:59 UTCGHSA enrichment
  49. 2026-08-19 17:03 UTCEPSS rescore
  50. 2026-08-18 23:53 UTCEG score recompute
  51. 2026-08-18 23:53 UTCGHSA enrichment
  52. 2026-08-18 13:48 UTCEPSS rescore
  53. 2026-08-17 21:46 UTCEG score recompute
  54. 2026-08-17 21:46 UTCGHSA enrichment
  55. 2026-08-17 13:47 UTCEPSS rescore
  56. 2026-08-16 19:35 UTCEG score recompute
  57. 2026-08-16 19:35 UTCGHSA enrichment
  58. 2026-08-16 14:56 UTCEPSS rescore
  59. 2026-08-16 02:14 UTCEPSS rescore
  60. 2026-08-15 17:30 UTCEG score recompute
  61. 2026-08-15 17:30 UTCGHSA enrichment
  62. 2026-08-15 01:30 UTCEPSS rescore
  63. 2026-08-14 15:24 UTCEG score recompute
  64. 2026-08-14 15:24 UTCGHSA enrichment
  65. 2026-08-13 22:00 UTCEPSS rescore
  66. 2026-08-13 13:18 UTCEG score recompute
  67. 2026-08-13 13:18 UTCGHSA enrichment
  68. 2026-08-13 05:19 UTCEG score recompute
  69. 2026-08-13 05:05 UTCEG score recompute
  70. 2026-08-13 05:05 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-19135?
CVE-2026-19135 is a medium vulnerability published on August 13, 2026. A JEXL expression sandbox bypass exists in multiple versions of OpenNMS Meridian and Horizon. A low-privileged authenticated user can submit a crafted expression to the Measurements REST API that escapes the sandbox and loads arbitrary Java classes on the server. This can potentially allow an…
When was CVE-2026-19135 disclosed?
CVE-2026-19135 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19135 actively exploited?
CVE-2026-19135 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 93.0% of all scored CVEs.
What is the CVSS score of CVE-2026-19135?
CVE-2026-19135 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-19135?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19135, 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.

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