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: 0.5%, top 60% of all CVEs by exploit prediction. 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%CVSS: 7.1Exploit: None knownExposed: 0

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

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
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 12, 2026

Advisory Details (3)

Auto-updated Aug 5, 2026
No patch confirmed yet.
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 rangeFixed inDependents
neutron2:17.1.1-6 ... 2:28.0.1-2 (91 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
neutron2:21.0.0-7 ... 2:28.0.1-2 (61 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
neutron2:26.0.0-9 ... 2:28.0.1-2 (27 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
neutron2:26.0.0-9 ... 2:28.0.1-1 (24 versions)2:28.0.1-2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 67× 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.

  1. 2026-08-21 03:31 UTCEG score recompute
  2. 2026-08-21 03:31 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 14:20 UTCGHSA enrichment
  5. 2026-08-20 00:27 UTCEG score recompute
  6. 2026-08-20 00:27 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 11:16 UTCGHSA enrichment
  9. 2026-08-18 21:59 UTCEG score recompute
  10. 2026-08-18 21:59 UTCGHSA enrichment
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-18 08:44 UTCGHSA enrichment
  13. 2026-08-17 19:33 UTCEG score recompute
  14. 2026-08-17 19:33 UTCGHSA enrichment
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-17 05:51 UTCGHSA enrichment
  17. 2026-08-16 16:40 UTCEG score recompute
  18. 2026-08-16 16:40 UTCGHSA enrichment
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 03:24 UTCEG score recompute
  21. 2026-08-16 03:24 UTCGHSA enrichment
  22. 2026-08-16 02:14 UTCEPSS rescore
  23. 2026-08-15 14:14 UTCEG score recompute
  24. 2026-08-15 14:14 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
Show 42 more
  1. 2026-08-15 01:03 UTCGHSA enrichment
  2. 2026-08-14 11:53 UTCGHSA enrichment
  3. 2026-08-13 22:42 UTCEG score recompute
  4. 2026-08-13 22:42 UTCGHSA enrichment
  5. 2026-08-13 22:00 UTCEPSS rescore
  6. 2026-08-13 09:32 UTCGHSA enrichment
  7. 2026-08-12 20:21 UTCEG score recompute
  8. 2026-08-12 20:21 UTCGHSA enrichment
  9. 2026-08-12 19:47 UTCEG score recompute
  10. 2026-08-12 19:47 UTCGHSA enrichment
  11. 2026-08-12 14:35 UTCEG score recompute
  12. 2026-08-12 14:35 UTCGHSA enrichment
  13. 2026-08-12 13:51 UTCEPSS rescore
  14. 2026-08-12 01:24 UTCEG score recompute
  15. 2026-08-12 01:24 UTCGHSA enrichment
  16. 2026-08-11 12:13 UTCGHSA enrichment
  17. 2026-08-10 23:03 UTCGHSA enrichment
  18. 2026-08-10 09:52 UTCGHSA enrichment
  19. 2026-08-09 20:42 UTCEG score recompute
  20. 2026-08-09 20:42 UTCGHSA enrichment
  21. 2026-08-09 13:46 UTCEPSS rescore
  22. 2026-08-09 07:31 UTCGHSA enrichment
  23. 2026-08-08 18:21 UTCEG score recompute
  24. 2026-08-08 18:21 UTCGHSA enrichment
  25. 2026-08-08 16:37 UTCEPSS rescore
  26. 2026-08-08 05:10 UTCEG score recompute
  27. 2026-08-08 05:10 UTCGHSA enrichment
  28. 2026-08-07 15:59 UTCGHSA enrichment
  29. 2026-08-07 02:48 UTCEG score recompute
  30. 2026-08-07 02:48 UTCGHSA enrichment
  31. 2026-08-06 13:47 UTCEPSS rescore
  32. 2026-08-06 13:37 UTCEG score recompute
  33. 2026-08-06 13:37 UTCGHSA enrichment
  34. 2026-08-06 13:09 UTCEG score recompute
  35. 2026-08-06 13:09 UTCGHSA enrichment
  36. 2026-08-06 08:44 UTCGHSA enrichment
  37. 2026-08-05 19:33 UTCEG score recompute
  38. 2026-08-05 19:33 UTCGHSA enrichment
  39. 2026-08-05 19:17 UTCEPSS rescore
  40. 2026-08-05 06:22 UTCEG score recompute
  41. 2026-08-05 05:34 UTCEG score recompute
  42. 2026-08-05 05:30 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database on August 5, 2026, with the most recent update on August 12, 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% probability of exploitation in the next 30 days, which ranks it in the top 60.0% of all scored CVEs.
What is the CVSS score of CVE-2026-55707?
CVE-2026-55707 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-55707?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55707, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-55707

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