CVE-2026-40861

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-01. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.5Exploit: NoneExposed: 0

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

A Dag author could either (a) create a symlink under their task's log directory pointing to an arbitrary file readable by the API server process (read-path attack — e.g. /etc/passwd or airflow.cfg) or (b) supply a task_id containing .. sequences accepted by the Task SDK's KEY_REGEX (write-path attack), and in both cases the FileTaskHandler resolves the log path outside the configured base_log_folder, leaking or overwriting arbitrary files. Only affects deployments where the worker log folder is shared with the API server. Users are advised to upgrade to apache-airflow 3.2.2 or later. As a defense-in-depth mitigation, deploy the worker and API server with separate log volumes so that worker-controlled paths cannot reach the API server's filesystem.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
47.4%
KEV
Not listed

Published

June 1, 2026

Last Modified

June 2, 2026

Advisory Details (3)

Auto-updated Jun 13, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

oss-security - CVE-2026-40861: Apache Airflow: Arbitrary File Read via Log Symlink following in FileTaskHandler

http://www.openwall.com/lists/oss-security/2026/05/31/1
generic
https://lists.apache.org/thread/823334db2559xjlwt59gpzjz47thnscl
github_pr

Refuse to follow log symlinks that resolve outside the base log folder

Fix merged in apache/airflow PR #65325 on 2026-04-16 — awaiting tagged release

https://github.com/apache/airflow/pull/65325

Vendor Advisories for CVE-2026-40861(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
apache-airflow1.10.0 ... 3.2.2rc3 (289 versions)3.2.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 69× 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 107 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40861?
CVE-2026-40861 is a medium vulnerability published on June 1, 2026. A Dag author could either (a) create a symlink under their task's log directory pointing to an arbitrary file readable by the API server process (read-path attack — e.g. /etc/passwd or airflow.cfg) or (b) supply a taskid containing .. sequences accepted by the Task SDK's KEYREGEX (write-path…
When was CVE-2026-40861 disclosed?
CVE-2026-40861 was first published in the National Vulnerability Database on June 1, 2026, with the most recent update on June 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40861 actively exploited?
CVE-2026-40861 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40861?
CVE-2026-40861 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-40861?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40861, 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.

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