CVE-2026-30803

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-17. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

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

Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers.This issue affects Connext Micro: from 4.0.0 before 4.3.0.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
21.8%
KEV
Not listed

Published

June 17, 2026

Last Modified

July 8, 2026

Advisory Details (1)

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

RTI Connext Security Bulletins and Advisories (last updated on 2026-06-17)

https://www.rti.com/vulnerabilities/#cve-2026-30803

Vendor Advisories for CVE-2026-30803(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 / 131× 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 157 total refreshes for this CVE.

  1. 2026-07-23 03:08 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-22 14:08 UTCEPSS rescore
  4. 2026-07-21 15:24 UTCEPSS rescore
  5. 2026-07-21 15:24 UTCEPSS rescore
  6. 2026-07-20 17:08 UTCEPSS rescore
  7. 2026-07-20 17:08 UTCEPSS rescore
  8. 2026-07-19 14:31 UTCEPSS rescore
  9. 2026-07-19 14:31 UTCEPSS rescore
  10. 2026-07-19 02:29 UTCEPSS rescore
  11. 2026-07-18 10:04 UTCEPSS rescore
  12. 2026-07-18 10:04 UTCEPSS rescore
  13. 2026-07-17 05:04 UTCGHSA enrichment
  14. 2026-07-17 01:08 UTCGHSA enrichment
  15. 2026-07-16 21:23 UTCGHSA enrichment
  16. 2026-07-16 17:03 UTCEPSS rescore
  17. 2026-07-16 17:03 UTCEPSS rescore
  18. 2026-07-16 11:36 UTCGHSA enrichment
  19. 2026-07-16 07:53 UTCGHSA enrichment
  20. 2026-07-16 04:09 UTCGHSA enrichment
  21. 2026-07-16 00:25 UTCGHSA enrichment
  22. 2026-07-15 20:42 UTCGHSA enrichment
  23. 2026-07-15 16:57 UTCEPSS rescore
  24. 2026-07-15 16:57 UTCEPSS rescore
  25. 2026-07-15 16:55 UTCGHSA enrichment
Show 75 more
  1. 2026-07-15 13:07 UTCGHSA enrichment
  2. 2026-07-15 07:33 UTCGHSA enrichment
  3. 2026-07-15 03:48 UTCGHSA enrichment
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-14 23:56 UTCGHSA enrichment
  7. 2026-07-14 20:12 UTCGHSA enrichment
  8. 2026-07-14 16:26 UTCGHSA enrichment
  9. 2026-07-14 12:43 UTCGHSA enrichment
  10. 2026-07-14 08:58 UTCGHSA enrichment
  11. 2026-07-14 04:33 UTCGHSA enrichment
  12. 2026-07-14 00:39 UTCGHSA enrichment
  13. 2026-07-13 22:30 UTCEPSS rescore
  14. 2026-07-13 20:56 UTCGHSA enrichment
  15. 2026-07-13 17:12 UTCGHSA enrichment
  16. 2026-07-13 13:08 UTCGHSA enrichment
  17. 2026-07-13 09:24 UTCGHSA enrichment
  18. 2026-07-13 06:13 UTCEPSS rescore
  19. 2026-07-13 06:13 UTCEPSS rescore
  20. 2026-07-13 05:32 UTCGHSA enrichment
  21. 2026-07-13 01:35 UTCGHSA enrichment
  22. 2026-07-12 21:51 UTCGHSA enrichment
  23. 2026-07-12 18:07 UTCGHSA enrichment
  24. 2026-07-12 14:18 UTCGHSA enrichment
  25. 2026-07-12 10:27 UTCGHSA enrichment
  26. 2026-07-12 06:36 UTCGHSA enrichment
  27. 2026-07-12 05:46 UTCEPSS rescore
  28. 2026-07-12 02:52 UTCGHSA enrichment
  29. 2026-07-11 23:08 UTCGHSA enrichment
  30. 2026-07-11 19:24 UTCGHSA enrichment
  31. 2026-07-11 15:41 UTCGHSA enrichment
  32. 2026-07-11 11:55 UTCGHSA enrichment
  33. 2026-07-11 08:27 UTCEPSS rescore
  34. 2026-07-11 08:07 UTCGHSA enrichment
  35. 2026-07-11 04:23 UTCGHSA enrichment
  36. 2026-07-11 00:33 UTCGHSA enrichment
  37. 2026-07-10 20:30 UTCGHSA enrichment
  38. 2026-07-10 16:46 UTCGHSA enrichment
  39. 2026-07-10 13:02 UTCGHSA enrichment
  40. 2026-07-10 09:11 UTCGHSA enrichment
  41. 2026-07-10 05:26 UTCGHSA enrichment
  42. 2026-07-10 01:12 UTCGHSA enrichment
  43. 2026-07-09 20:48 UTCGHSA enrichment
  44. 2026-07-09 19:10 UTCEPSS rescore
  45. 2026-07-09 17:01 UTCGHSA enrichment
  46. 2026-07-09 11:54 UTCGHSA enrichment
  47. 2026-07-09 08:11 UTCGHSA enrichment
  48. 2026-07-09 04:26 UTCGHSA enrichment
  49. 2026-07-09 00:35 UTCGHSA enrichment
  50. 2026-07-08 20:48 UTCEG score recompute▲ 0.30
  51. 2026-07-08 20:48 UTCGHSA enrichment
  52. 2026-07-08 15:15 UTCEPSS rescore
  53. 2026-07-08 14:36 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  54. 2026-07-08 09:36 UTCGHSA enrichment
  55. 2026-07-07 22:25 UTCGHSA enrichment
  56. 2026-07-07 13:46 UTCEPSS rescore
  57. 2026-07-07 11:16 UTCGHSA enrichment
  58. 2026-07-06 23:40 UTCGHSA enrichment
  59. 2026-07-06 16:27 UTCEPSS rescore
  60. 2026-07-06 16:27 UTCEPSS rescore
  61. 2026-07-06 12:30 UTCGHSA enrichment
  62. 2026-07-06 02:23 UTCEPSS rescore
  63. 2026-07-06 02:23 UTCEPSS rescore
  64. 2026-07-06 01:20 UTCGHSA enrichment
  65. 2026-07-05 14:10 UTCGHSA enrichment
  66. 2026-07-05 03:01 UTCGHSA enrichment
  67. 2026-07-05 02:30 UTCEPSS rescore
  68. 2026-07-04 15:50 UTCGHSA enrichment
  69. 2026-07-04 06:31 UTCEPSS rescore
  70. 2026-07-04 04:41 UTCGHSA enrichment
  71. 2026-07-03 16:24 UTCGHSA enrichment
  72. 2026-07-03 05:13 UTCGHSA enrichment
  73. 2026-07-02 17:58 UTCGHSA enrichment
  74. 2026-07-02 06:48 UTCGHSA enrichment
  75. 2026-07-01 19:39 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-30803?
CVE-2026-30803 is a critical vulnerability published on June 17, 2026. Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers.This issue affects Connext Micro: from 4.0.0 before 4.3.0.
When was CVE-2026-30803 disclosed?
CVE-2026-30803 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-30803 actively exploited?
CVE-2026-30803 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-30803?
CVE-2026-30803 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-30803?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-30803, 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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