CVE-2026-77611

HIGHPre-NVD 7.17.1
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (30th 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
Elevated
7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.1Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

SeaweedFS is a distributed storage system for files and blobs. In versions prior to 4.40, an authenticated S3 principal with permissions scoped to a nested object key can overwrite a different object outside that scope by calling PutObjectAcl on the key it is allowed to access. The handler authorizes the request against the requested nested key but then writes the updated entry back to the bucket root rather than the key's actual parent directory, so an ACL change on allowed/protected.txt is instead applied to protected.txt at the bucket root. Because the update carries the full entry rather than only ACL metadata, an existing target object is overwritten with the content, metadata, owner information, and ACL of the scoped object, bypassing the object-level action scoping configured through the static S3 identity file. This issue is fixed in version 4.40.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
48
EG Risk 48/100

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)
Severity71% × 45%
The EG Score, 7.1 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
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 public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

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

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 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 partial (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 26, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Aug 26, 2026
Fix named in the CVE record. Sources: github, github_commit.
GitHub commit

commit 311bc3a6dfbd (seaweedfs/seaweedfs)

Fix landed in seaweedfs/seaweedfs commit 311bc3a6dfbd — awaiting tagged release

https://github.com/seaweedfs/seaweedfs/commit/311bc3a6dfbd042751692bc3de8accc516fcf8c1
GitHub advisoryMentions a patch (unverified)

Authenticated S3 object-scope bypass in PutObjectAcl allows overwriting a different object with the same basename · Advisory · seaweedfs/seaweedfs · GitHub

https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-9x53-cjpr-m682

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 55× 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.

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. 3 repeat rows among the latest 92 are merged into the row they repeat.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  2. 2026-10-13 06:55 UTCEG score recompute
  3. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
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  5. 2026-10-11 19:23 UTCEG score recompute
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  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  10. 2026-10-10 06:03 UTCEG score recompute
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  12. 2026-10-09 03:19 UTCEG score recompute
  13. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  14. 2026-10-08 01:44 UTCEG score recompute
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  16. 2026-10-06 21:47 UTCEG score recompute
  17. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-10-05 20:44 UTCEG score recompute
  19. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  20. 2026-10-05 08:13 UTCEG score recompute
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  22. 2026-10-03 16:05 UTCEG score recompute
  23. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  24. 2026-10-02 22:11 UTCEG score recompute
  25. 2026-10-01 21:04 UTCEG score recompute
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  1. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  2. 2026-09-30 19:57 UTCEG score recompute
  3. 2026-09-30 06:00 UTCEG score recompute
  4. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  5. 2026-09-28 23:13 UTCEG score recompute
  6. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  7. 2026-09-27 21:33 UTCEG score recompute
  8. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-09-26 20:30 UTCEG score recompute
  10. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  11. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  12. 2026-09-24 16:10 UTCEG score recompute
  13. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  14. 2026-09-24 03:38 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  16. 2026-09-23 02:35 UTCEG score recompute
  17. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  18. 2026-09-22 01:31 UTCEG score recompute
  19. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-09-21 00:29 UTCEG score recompute
  21. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  22. 2026-09-19 23:17 UTCEG score recompute
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  24. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  25. 2026-09-17 20:57 UTCEG score recompute
  26. 2026-09-16 19:06 UTCEG score recompute
  27. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  28. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  29. 2026-09-15 15:09 UTCEG score recompute
  30. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  31. 2026-09-14 01:33 UTCEG score recompute
  32. 2026-09-13 00:30 UTCEG score recompute
  33. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  34. 2026-09-11 23:26 UTCEG score recompute
  35. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  36. 2026-09-11 10:54 UTCEG score recompute
  37. 2026-09-10 09:44 UTCEG score recompute
  38. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  39. 2026-09-09 00:47 UTCEG score recompute
  40. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  41. 2026-09-07 17:25 UTCEG score recompute
  42. 2026-09-06 16:22 UTCEG score recompute
  43. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  44. 2026-09-06 03:50 UTCEG score recompute
  45. 2026-09-04 14:10 UTCEG score recompute
  46. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  47. 2026-09-03 00:26 UTCEG score recompute
  48. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  49. 2026-09-01 23:09 UTCEG score recompute
  50. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  51. 2026-09-01 10:37 UTCEG score recompute
  52. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  53. 2026-08-30 20:55 UTCEG score recompute
  54. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  55. 2026-08-30 08:24 UTCEG score recompute
  56. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  57. 2026-08-29 07:20 UTCEG score recompute
  58. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  59. 2026-08-27 17:30 UTCEG score recompute
  60. 2026-08-27 17:06 UTCEG score recompute
  61. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  62. 2026-08-26 22:24 UTCEG score recompute
  63. 2026-08-26 22:02 UTCEG score recomputeFirst assessed: 7.1 HIGH
  64. 2026-08-26 22:01 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-77611?
CVE-2026-77611 is a high-severity vulnerability; its CVE record was published on August 26, 2026. SeaweedFS is a distributed storage system for files and blobs. In versions prior to 4.40, an authenticated S3 principal with permissions scoped to a nested object key can overwrite a different object outside that scope by calling PutObjectAcl on the key it is allowed to access. The handler…
When was the CVE record for CVE-2026-77611 published?
The CVE record for CVE-2026-77611 was published on August 26, 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 9, 2026; the record at its source may have been updated since.
Is CVE-2026-77611 actively exploited?
CVE-2026-77611 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77611?
CVE-2026-77611 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77611?
The CVE record for CVE-2026-77611 names the fix: "This issue is fixed in version 4.40."

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