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CVE-2026-62239

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

CVSS 4.0 5.3 MEDIUMCVSS 3.1 6.6 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-62239

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-62239

Published

flash-attention

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Dao-AILab",
                    "product": "flash-attention",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/flash-attn",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "custom",
                            "lessThanOrEqual": "2.8.3.post1"
                        },
                        {
                            "status": "unaffected",
                            "version": "0816ef12f424c6ec94b057a72c275b14f6e6edb2",
                            "versionType": "git"
                        }
                    ],
                    "repo": "https://github.com/Dao-AILab/flash-attention"
                }

Original source record · Cite this exact observation · Complete original publisher JSON