Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-62239
Dao-AILab flash-attention — FlashAttention Symlink Attack via tarfile.extractall in hopper/setup.py
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV
L L P L P H H N 5.3 .0016 5.0 —
AFFECTED
Product Versions Fixed
flash-attention unspecified 0816ef12f424c6ec94b057a72c275b14f6e6edb2
TIMELINE
Jul 13 Reserved by VulnCheck
Jul 13 Published (CNA: VulnCheck)
Sep 17 EXPLOIT PUBLISHED — CVE-2026-62239 (Dao-AILab flash-attention). Public exploit reference added.
Description
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| July 13, 2026 | Reserved | Reserved by VulnCheck |
| July 13, 2026 | Published | Published (CNA: VulnCheck) |
| September 17, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-62239 (Dao-AILab flash-attention). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Dao-AILab | flash-attention | — | — | 0816ef12f424c6ec94b057a72c275b14f6e6edb2 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-62239 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
