CVE-2026-5367

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-04-24. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.6Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to the disclosure of sensitive information stored in heap memory, which is then returned to the attacker's virtual machine port.

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity86% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

April 24, 2026

Last Modified

August 25, 2026

Advisory Details (10)

Auto-updated Apr 29, 2026
Patch available. Sources: redhat.
generic

oss-security - [ADVISORY] CVE-2026-5367: Heap over-read in OVN DHCPv6 Client ID processing

http://www.openwall.com/lists/oss-security/2026/04/20/3
redhat Patch Available

2455863 – (CVE-2026-5367) CVE-2026-5367 ovn: OVN: Information disclosure via crafted DHCPv6 packets

Affected: Red Hat Enterprise Linux 8

https://bugzilla.redhat.com/show_bug.cgi?id=2455863
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-5367
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:11702
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:11701
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:11700
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:11698
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:11696
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:11695
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:11694

Vendor Advisories for CVE-2026-5367(10)

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

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatovn25.03-0:25.03.2-100.el10fdp2026-06-01redhat
redhatovn25.09-0:25.09.2-103.el10fdp2026-06-01redhat
redhatovn25.03-0:25.03.2-100.el9fdp2026-04-29redhat
redhatovn25.09-0:25.09.2-103.el9fdp2026-04-29redhat
redhatovn23.06-0:23.06.4-30.el8fdp2026-04-29redhat
redhatovn-2021-0:21.12.0-145.el8fdp2026-04-29redhat
redhatovn23.06-0:23.06.4-30.el9fdp2026-04-29redhat
redhatovn24.03-0:24.03.7-82.el9fdp2026-04-29redhat
redhatovn23.09-0:23.09.6-16.el9fdp2026-04-29redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
ovn23.03.0-1 ... 26.03.1-1 (31 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ovn25.03.0-1 ... 26.03.1-1 (15 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ovn25.03.0-1 ... 26.03.0~git20260216.b543a88-4 (11 versions)26.03.0-4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 80× 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 254 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-5367?
CVE-2026-5367 is a high vulnerability published on April 24, 2026. A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to…
When was CVE-2026-5367 disclosed?
CVE-2026-5367 was first published in the National Vulnerability Database on April 24, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5367 actively exploited?
CVE-2026-5367 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 43.6% of all scored CVEs.
What is the CVSS score of CVE-2026-5367?
CVE-2026-5367 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-5367?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5367, 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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