CVE-2026-54330

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (28th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — Patch released this week
8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the Ceph Object Gateway (RGW) SigV4 handler does not reject requests that carry x-amz-* headers absent from the signed header set, allowing anyone holding a presigned URL to attach arbitrary unsigned x-amz-* headers that RGW will honor. AWS S3 requires every x-amz-* header on a SigV4 request to be signed and rejects requests bearing additional unsigned headers, but RGW validates only the headers listed in X-Amz-SignedHeaders and ignores any extra ones, so they take effect without being covered by the signature. By adding such headers to a presigned PUT URL, an attacker can grant themselves more capabilities than the URL's signer intended and escalate their privileges. This issue is fixed in versions 20.2.4 and 19.2.6.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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 (value × EchelonGraph’s weight)
Severity81% × 45%
The EG Score, 8.1 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 27, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Aug 27, 2026
Patch available. Sources: github_commit, github.
GitHub commit

commit 5978c866d4a0 (ceph/ceph)

Fix landed in ceph/ceph commit 5978c866d4a0 — awaiting tagged release

https://github.com/ceph/ceph/commit/5978c866d4a0812fbb024745c4f1e79aaecd6c6a
GitHub commit

commit 5837aa8e6047 (ceph/ceph)

Fix landed in ceph/ceph commit 5837aa8e6047 — awaiting tagged release

https://github.com/ceph/ceph/commit/5837aa8e60471128dbb672b0ff6f1b1feebe08a7
GitHub advisoryMentions a patch (unverified)

SigV4 verifier error allows attachment of aribtrary x-amz-* headers resulting in privilege escalation · Advisory · ceph/ceph · GitHub

https://github.com/ceph/ceph/security/advisories/GHSA-rmjq-ffrm-j6vj

Vendor Advisories for CVE-2026-54330(3)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubunturbd-nbd (20.2.0-0ubuntu2.1) @ resolute2026-10-10ubuntu
redhatceph-2:19.2.1-423.el9cp2026-10-08redhat
redhatrhceph/rhceph-8-rhel9:17911769902026-10-08redhat

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 rangeFix by version rangeDependents
ceph16.2.11+ds-2 ... 20.2.4+ds-1 (63 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ceph18.2.7+ds-1 ... 20.2.4+ds-1 (20 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ceph18.2.7+ds-1 ... 20.2.2+ds-9 (18 versions)
  • every version up to 20.2.4+ds-1: fixed in 20.2.4+ds-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 18× in last 7d / 101× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 146 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 46 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:18 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  9. 2026-10-10 13:46 UTCVendor advisory
  10. 2026-10-10 01:44 UTCEG score recompute
  11. 2026-10-10 01:44 UTCVendor advisory
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-10-09 02:55 UTCEG score recompute
  14. 2026-10-09 02:55 UTCVendor advisory
  15. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-10-08 01:13 UTCEG score recompute
  17. 2026-10-08 01:13 UTCVendor advisory
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-10-07 02:49 UTCEG score recompute
  20. 2026-10-07 02:49 UTCVendor advisory
  21. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-10-06 14:58 UTCVendor advisory
  23. 2026-10-06 02:27 UTCEG score recompute
  24. 2026-10-06 02:27 UTCVendor advisory
  25. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 28th percentile
Show 75 more
  1. 2026-10-05 14:19 UTCVendor advisory
  2. 2026-10-05 02:28 UTCEG score recompute
  3. 2026-10-05 02:28 UTCVendor advisory
  4. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-10-04 14:37 UTCVendor advisory
  6. 2026-10-04 02:47 UTCVendor advisory
  7. 2026-10-03 14:56 UTCEG score recompute
  8. 2026-10-03 14:56 UTCVendor advisory
  9. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  10. 2026-10-02 19:45 UTCEG score recompute
  11. 2026-10-02 19:45 UTCVendor advisory
  12. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-10-02 07:54 UTCVendor advisory
  14. 2026-10-01 19:52 UTCEG score recompute
  15. 2026-10-01 19:52 UTCVendor advisory
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  17. 2026-10-01 07:44 UTCVendor advisory
  18. 2026-09-30 19:53 UTCEG score recompute
  19. 2026-09-30 19:53 UTCVendor advisory
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-09-30 04:53 UTCEG score recompute
  22. 2026-09-30 04:53 UTCVendor advisory
  23. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  24. 2026-09-29 12:12 UTCEG score recompute
  25. 2026-09-29 12:12 UTCVendor advisory
  26. 2026-09-28 21:12 UTCEG score recompute
  27. 2026-09-28 21:12 UTCVendor advisory
  28. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  29. 2026-09-28 05:53 UTCVendor advisory
  30. 2026-09-27 18:03 UTCEG score recompute
  31. 2026-09-27 18:03 UTCVendor advisory
  32. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  33. 2026-09-27 06:13 UTCVendor advisory
  34. 2026-09-26 18:22 UTCEG score recompute
  35. 2026-09-26 18:22 UTCVendor advisory
  36. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  37. 2026-09-25 11:43 UTCVendor advisory
  38. 2026-09-24 23:28 UTCEG score recompute
  39. 2026-09-24 23:28 UTCVendor advisory
  40. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  41. 2026-09-24 11:16 UTCVendor advisory
  42. 2026-09-23 23:26 UTCEG score recompute
  43. 2026-09-23 23:26 UTCVendor advisory
  44. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  45. 2026-09-23 11:30 UTCVendor advisory
  46. 2026-09-22 23:40 UTCEG score recompute
  47. 2026-09-22 23:40 UTCVendor advisory
  48. 2026-09-22 11:20 UTCVendor advisory
  49. 2026-09-21 23:30 UTCEG score recompute
  50. 2026-09-21 23:30 UTCVendor advisory
  51. 2026-09-21 11:39 UTCVendor advisory
  52. 2026-09-20 23:47 UTCEG score recompute
  53. 2026-09-20 23:47 UTCVendor advisory
  54. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  55. 2026-09-20 11:56 UTCVendor advisory
  56. 2026-09-19 23:34 UTCEG score recompute
  57. 2026-09-19 23:34 UTCVendor advisory
  58. 2026-09-19 11:43 UTCVendor advisory
  59. 2026-09-18 23:45 UTCEG score recompute
  60. 2026-09-18 23:45 UTCVendor advisory
  61. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  62. 2026-09-18 11:53 UTCVendor advisory
  63. 2026-09-18 00:02 UTCEG score recompute
  64. 2026-09-18 00:02 UTCVendor advisory
  65. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  66. 2026-09-17 11:04 UTCVendor advisory
  67. 2026-09-16 23:12 UTCEG score recompute
  68. 2026-09-16 23:12 UTCVendor advisory
  69. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  70. 2026-09-16 11:21 UTCEG score recompute
  71. 2026-09-16 11:21 UTCVendor advisory
  72. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  73. 2026-09-15 23:30 UTCVendor advisory
  74. 2026-09-15 11:06 UTCEG score recompute
  75. 2026-09-15 11:06 UTCVendor advisory

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Frequently asked(5)

What is CVE-2026-54330?
CVE-2026-54330 is a high-severity vulnerability; its CVE record was published on August 27, 2026. Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the Ceph Object Gateway (RGW) SigV4 handler does not reject requests that carry x-amz- headers absent from the signed header set, allowing anyone holding a…
When was the CVE record for CVE-2026-54330 published?
The CVE record for CVE-2026-54330 was published on August 27, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 8, 2026; the record at its source may have been updated since.
Is CVE-2026-54330 actively exploited?
CVE-2026-54330 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54330?
CVE-2026-54330 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54330?
A fix for CVE-2026-54330 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54330 are linked in the Vendor Advisories panel on this page.

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