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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 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 PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

June 17, 2026

Last Modified

July 8, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

RTI Connext Security Bulletins and Advisories (last updated on 2026-07-21)

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 10× in last 7d / 68× 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 388 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 0% probability of exploitation in the next 30 days, which ranks it in the top 77.8% of all scored CVEs.
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.

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