CVE-2026-71191

MEDIUMPre-NVD 6.06.0—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (33rd 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
6.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In OpenStack Swift through 2.38.0, S3API middleware does not enforce that semantic x-amz-* headers are covered by the SigV4 signature on presigned URL requests. An attacker who obtains a presigned PUT URL can inject an unsigned X-Amz-Copy-Source header, causing Swift to perform a server-side copy from an arbitrary source object using the signer's authorization context. The attacker can read any object the signer has access to, provided the target project_id, container name, and object name are known. This affects all deployments using the default s3_acl=false configuration.

CVSS v3
6.0
EG Score
6.0MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100CISA 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
Severity60% × 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
33rd
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

September 9, 2026

Advisory Details (3)

Auto-updated Aug 5, 2026
Patch available.
generic

OSSA-2026-030: Swift S3API header authorization bypass — OpenStack Security Advisories 0.0.1.dev359 documentation

https://security.openstack.org/ossa/OSSA-2026-030.html
generic

oss-security - [OSSA-2026-030] OpenStack Swift: S3API header authorization bypass (CVE-2026-pending)

https://openwall.com/lists/oss-security/2026/07/28/26
generic

Bug #2158733 “[OSSA-2026-030] Swift S3API header authorization b...” : Bugs : OpenStack Object Storage (swift)

https://launchpad.net/bugs/2158733

Vendor Advisories for CVE-2026-71191(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
swift2.26.0-10 ... 2.37.1-6 (55 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
swift2.30.0-4, 2.30.1-0+deb12u1, 2.30.1-0+deb12u2
  • every version up to 2.30.1-0+deb12u3: fixed in 2.30.1-0+deb12u3
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
swift2.35.0-4, 2.35.1-0+deb13u1, 2.35.1-0+deb13u2
  • every version up to 2.35.1-0+deb13u3: fixed in 2.35.1-0+deb13u3
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
swift2.35.0-4 ... 2.37.1-5 (17 versions)
  • every version up to 2.37.1-6: fixed in 2.37.1-6
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 66× 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 152 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-71191?
CVE-2026-71191 is a medium vulnerability published on August 5, 2026. In OpenStack Swift through 2.38.0, S3API middleware does not enforce that semantic x-amz-* headers are covered by the SigV4 signature on presigned URL requests. An attacker who obtains a presigned PUT URL can inject an unsigned X-Amz-Copy-Source header, causing Swift to perform a server-side copy…
When was CVE-2026-71191 disclosed?
CVE-2026-71191 was first published on August 5, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71191 actively exploited?
CVE-2026-71191 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71191?
CVE-2026-71191 has a CVSS base score of 6.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71191?
A fix for CVE-2026-71191 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-71191 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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