CVE-2026-39042

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

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

An issue in MikroTIk (SIA Mikrotikls, Latvia) RouterOS 7.21.x before v.7.21.4 and 7.22.x before v.7.22.2 allows a remote attacker to cause a denial of service via the unflatten() function in libumsg.so.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 15, 2026

Advisory Details (2)

Auto-updated Jul 15, 2026
No patch confirmed yet.
generic

Patrik Žák — Ethical Hacker & Red Teamer

https://zakpatrik.cz/blog/finding-an-integer-overflow-in-mikrotik-routeros-core-ipc-library
generic

MikroTik · Security

https://mikrotik.com/supportsec

Vendor Advisories for CVE-2026-39042(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 19× in last 7d / 110× 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 154 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-39042?
CVE-2026-39042 is a high vulnerability published on July 13, 2026. An issue in MikroTIk (SIA Mikrotikls, Latvia) RouterOS 7.21.x before v.7.21.4 and 7.22.x before v.7.22.2 allows a remote attacker to cause a denial of service via the unflatten() function in libumsg.so.
When was CVE-2026-39042 disclosed?
CVE-2026-39042 was first published in the National Vulnerability Database on July 13, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39042 actively exploited?
CVE-2026-39042 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.8% of all scored CVEs.
What is the CVSS score of CVE-2026-39042?
CVE-2026-39042 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-39042?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39042, 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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