CVE-2026-66139

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2026-07-24. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 0

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

OpenStack Zaqar through 22.0.0 allows authentication bypass via an EXTRA-SPEC header when a UUID is known.

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
22(Track)
EG Risk 22/100SSVC: 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
Severity48% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

July 24, 2026

Last Modified

July 30, 2026

Advisory Details (2)

Auto-updated Jul 24, 2026
No patch confirmed yet.
generic

oss-security - [OSSA-2026-029] OpenStack Zaqar: EXTRA-SPEC header bypasses Keystone authentication (CVE-2026-pending)

https://www.openwall.com/lists/oss-security/2026/07/23/7
generic

Bug #2161254 “[OSSA-2026-029] Zaqar EXTRA-SPEC Header Bypasses K...” : Bugs : OpenStack Security Advisory

https://bugs.launchpad.net/ossa/+bug/2161254

Vendor Advisories for CVE-2026-66139(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
zaqar15.0.0-1 ... 22.0.0~rc1-2 (28 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
zaqar20.0.0-2 ... 22.0.0~rc1-2 (10 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
zaqar20.0.0-2 ... 22.0.0~rc1-2 (9 versions)22.0.0-3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 69× 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 137 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66139?
CVE-2026-66139 is a medium vulnerability published on July 24, 2026. OpenStack Zaqar through 22.0.0 allows authentication bypass via an EXTRA-SPEC header when a UUID is known.
When was CVE-2026-66139 disclosed?
CVE-2026-66139 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66139 actively exploited?
CVE-2026-66139 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 74.1% of all scored CVEs.
What is the CVSS score of CVE-2026-66139?
CVE-2026-66139 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-66139?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66139, 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-2026-66139

Explore →

Is Your Infrastructure Affected by CVE-2026-66139?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs