CVE-2026-91771

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

Weights & Biases wandb before 0.29.0 fails to validate the file name from server responses in the File.download function, allowing path traversal attacks. Attackers controlling the backend can supply file names with directory traversal sequences to write files outside the intended download directory, potentially enabling code execution through modification of shell startup files or Python import paths.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
66%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 24, 2026

Advisory Details (6)

Auto-updated Sep 15, 2026
Patch available. Sources: github_commit, github_release.
generic

Weights & Biases wandb before 0.29.0 Path Traversal via File Download | Advisories | VulnCheck

https://www.vulncheck.com/advisories/weights-biases-wandb-before-0.29.0-path-traversal-via-file-download
generic

GitHub - wandb/wandb: The AI developer platform. Use Weights & Biases to train and fine-tune models, and manage models from experimentation to production. · GitHub

https://github.com/wandb/wandb
generic

wandb/wandb/apis/public/files.py at v0.27.2 · wandb/wandb · GitHub

https://github.com/wandb/wandb/blob/v0.27.2/wandb/apis/public/files.py#L319-L347
github_release Patch Available

v0.29.0

Patch available: wandb/wandb v0.29.0

https://github.com/wandb/wandb/releases/tag/v0.29.0
github_commit Patch Available

commit e52558f3a6a9 (wandb/wandb)

Patch available: wandb/wandb v0.29.0 (contains commit e52558f3a6a9)

https://github.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6
generic

[Bug-App]: Path traversal in public API File.download enables arbitrary file write · Issue #12592 · wandb/wandb · GitHub

https://github.com/wandb/wandb/issues/12592

Vendor Advisories for CVE-2026-91771(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 33× in last 7d / 50× 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.

  1. 2026-09-25 08:48 UTCGHSA enrichment
  2. 2026-09-24 21:19 UTCEG score recompute
  3. 2026-09-24 21:19 UTCGHSA enrichment
  4. 2026-09-24 14:52 UTCEG score recompute
  5. 2026-09-24 14:52 UTCGHSA enrichment
  6. 2026-09-24 14:04 UTCEPSS rescore
  7. 2026-09-24 12:31 UTCGHSA enrichment
  8. 2026-09-24 01:01 UTCEG score recompute
  9. 2026-09-24 01:01 UTCGHSA enrichment
  10. 2026-09-23 17:54 UTCEPSS rescore
  11. 2026-09-23 13:32 UTCGHSA enrichment
  12. 2026-09-23 02:03 UTCEG score recompute
  13. 2026-09-23 02:03 UTCGHSA enrichment
  14. 2026-09-22 16:01 UTCEPSS rescore
  15. 2026-09-22 14:33 UTCGHSA enrichment
  16. 2026-09-22 02:57 UTCEG score recompute
  17. 2026-09-22 02:57 UTCGHSA enrichment
  18. 2026-09-21 21:09 UTCEPSS rescore
  19. 2026-09-21 15:27 UTCGHSA enrichment
  20. 2026-09-21 03:58 UTCEG score recompute
  21. 2026-09-21 03:58 UTCGHSA enrichment
  22. 2026-09-20 20:16 UTCEPSS rescore
  23. 2026-09-20 16:29 UTCGHSA enrichment
  24. 2026-09-20 05:00 UTCGHSA enrichment
  25. 2026-09-19 17:31 UTCEG score recompute
Show 25 more
  1. 2026-09-19 17:31 UTCGHSA enrichment
  2. 2026-09-19 06:02 UTCEG score recompute
  3. 2026-09-19 06:02 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 18:33 UTCEG score recompute
  6. 2026-09-18 18:33 UTCGHSA enrichment
  7. 2026-09-18 17:29 UTCEG score recompute
  8. 2026-09-18 17:29 UTCGHSA enrichment
  9. 2026-09-18 11:20 UTCGHSA enrichment
  10. 2026-09-17 23:51 UTCEG score recompute
  11. 2026-09-17 23:50 UTCGHSA enrichment
  12. 2026-09-17 19:32 UTCEPSS rescore
  13. 2026-09-17 11:56 UTCGHSA enrichment
  14. 2026-09-17 00:27 UTCEG score recompute
  15. 2026-09-17 00:27 UTCGHSA enrichment
  16. 2026-09-16 14:09 UTCEPSS rescore
  17. 2026-09-16 12:57 UTCEG score recompute
  18. 2026-09-16 12:57 UTCGHSA enrichment
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-16 01:28 UTCGHSA enrichment
  21. 2026-09-15 13:59 UTCEG score recompute
  22. 2026-09-15 13:59 UTCGHSA enrichment
  23. 2026-09-15 02:30 UTCEG score recompute
  24. 2026-09-15 01:40 UTCEG score recompute
  25. 2026-09-15 01:39 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91771?
CVE-2026-91771 is a high vulnerability published on September 15, 2026. Weights & Biases wandb before 0.29.0 fails to validate the file name from server responses in the File.download function, allowing path traversal attacks. Attackers controlling the backend can supply file names with directory traversal sequences to write files outside the intended download…
When was CVE-2026-91771 disclosed?
CVE-2026-91771 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91771 actively exploited?
CVE-2026-91771 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 34.1% of all scored CVEs.
What is the CVSS score of CVE-2026-91771?
CVE-2026-91771 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-91771?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91771, 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

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