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% (31st 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

Also known asEUVD-2026-67276 (ENISA EUVD)Source: ENISA EUVD

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 impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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
31st
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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.

The score's inputs: 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) @ resolute2026-10-29ubuntu
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 8× in last 7d / 35× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 189 rows 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 89 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

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

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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 (31st 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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