CVE-2026-55707

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (34th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In OpenStack Neutron before 28.0.2, the subnetpool onboarding API does not verify ownership of the target subnets. An authenticated user can onboard subnets from another project's shared network into their own subnetpool, mutating the victim's subnet state and altering L3 routing and address scope behavior for victim routers.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100CISA SSVC

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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
34th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 31, 2026

Advisory Details (3)

Auto-updated Aug 5, 2026
Patch available.
generic

oss-security - [OSSA-2026-032] OpenStack Neutron: Subnetpool onboarding cross-project subnet mutation (CVE-2026-55707)

https://www.openwall.com/lists/oss-security/2026/07/29/5
generic

OSSA-2026-032: Subnetpool onboarding cross-project subnet mutation — OpenStack Security Advisories 0.0.1.dev359 documentation

https://security.openstack.org/ossa/OSSA-2026-032.html
generic

Bug #2152113 “[OSSA-2026-032] Shared-network consumer can re-sco...” : Bugs : neutron

https://launchpad.net/bugs/2152113

Vendor Advisories for CVE-2026-55707(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
neutron2:17.1.1-6 ... 2:28.0.1-2 (91 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
neutron2:21.0.0-7
  • every version up to 2:21.0.0-7+deb12u1: fixed in 2:21.0.0-7+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
neutron2:26.0.0-9, 2:26.0.0-9+deb13u1, 2:26.0.3-0+deb13u2
  • every version up to 2:26.0.3-0+deb13u3: fixed in 2:26.0.3-0+deb13u3
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
neutron2:26.0.0-9 ... 2:28.0.1-1 (24 versions)
  • every version up to 2:28.0.1-2: fixed in 2:28.0.1-2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 90× 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 203 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-55707?
CVE-2026-55707 is a high vulnerability published on August 5, 2026. In OpenStack Neutron before 28.0.2, the subnetpool onboarding API does not verify ownership of the target subnets. An authenticated user can onboard subnets from another project's shared network into their own subnetpool, mutating the victim's subnet state and altering L3 routing and address scope…
When was CVE-2026-55707 disclosed?
CVE-2026-55707 was first published on August 5, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55707 actively exploited?
CVE-2026-55707 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55707?
CVE-2026-55707 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55707?
A fix for CVE-2026-55707 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55707 are linked in the Vendor Advisories panel on this page.

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