CVE-2026-62239

MEDIUMPre-NVD 6.66.6—
EchelonGraph scoreMEDIUM confidence

Score 6.6 from GitHub Security Advisory published 2026-07-14. a secondary CVSS source baseline 6.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.6Exploit: Elevated riskExposed: 0

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

FlashAttention through 2.8.3.post1, fixed in commit 0816ef1, contains a symlink attack vulnerability in the download_and_copy() function within hopper/setup.py that extracts NVIDIA toolchain archives without validating symlinks or filtering tar members. A local attacker can pre-plant a symlink in the predictable cache directory to redirect extracted binaries to an attacker-chosen location, enabling arbitrary file write with victim privileges during build time.

CVSS v3
6.6
EG Score
6.6(medium)
EG Risk
46(Track*)
EG Risk 46/100SSVC: 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
Severity66% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 13, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

FlashAttention Symlink Attack via tarfile.extractall in hopper/setup.py | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flashattention-symlink-attack-via-tarfile-extractall-in-hopper-setup-py
github_commit

commit 0816ef12f424 (Dao-AILab/flash-attention)

Fix landed in Dao-AILab/flash-attention commit 0816ef12f424 — awaiting tagged release

https://github.com/Dao-AILab/flash-attention/commit/0816ef12f424c6ec94b057a72c275b14f6e6edb2
github_pr

hopper/setup.py: harden tarfile extraction against path traversal and symlink escape

Fix merged in Dao-AILab/flash-attention PR #2702 on 2026-07-12 — awaiting tagged release

https://github.com/Dao-AILab/flash-attention/pull/2702
generic🟡 PoC Available

Bare tarfile.extractall into Predictable Cache During Build in flash-attention · Issue #2637 · Dao-AILab/flash-attention · GitHub

https://github.com/Dao-AILab/flash-attention/issues/2637

Vendor Advisories for CVE-2026-62239(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 14× in last 7d / 79× 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 120 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-62239?
CVE-2026-62239 is a medium vulnerability published on July 13, 2026. FlashAttention through 2.8.3.post1, fixed in commit 0816ef1, contains a symlink attack vulnerability in the downloadandcopy() function within hopper/setup.py that extracts NVIDIA toolchain archives without validating symlinks or filtering tar members. A local attacker can pre-plant a symlink in the…
When was CVE-2026-62239 disclosed?
CVE-2026-62239 was first published in the National Vulnerability Database on July 13, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62239 actively exploited?
CVE-2026-62239 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.2% of all scored CVEs.
What is the CVSS score of CVE-2026-62239?
CVE-2026-62239 has a CVSS v3 base score of 6.6 (NVD).
How do I remediate CVE-2026-62239?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-62239, 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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