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    2 vulnerabilities found for flash-attention by Dao-AILab

    CVE-2026-62239 (GCVE-0-2026-62239)

    Vulnerability from nvd – Published: 2026-07-13 21:03 – Updated: 2026-07-13 21:03 X_Open Source
    VLAI
    Title
    FlashAttention Symlink Attack via tarfile.extractall in hopper/setup.py
    Summary
    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.
    Severity
    5.3 (Medium)
    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    6.6 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
    CWE
    • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
    Assigner
    References
    Impacted products
    Vendor Product Version
    Dao-AILab flash-attention Affected: 0 , ≤ 2.8.3.post1 (custom)
    Unaffected: 0816ef12f424c6ec94b057a72c275b14f6e6edb2 (git)
    		Create a notification for this product.
    Date Public
    2026-06-09 00:00
    Credits
    YU SUN
    Show details on NVD website
    To clipboard 

    {
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          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/flash_attn_2_cuda",
          "product": "flash-attention",
          "repo": "https://github.com/Dao-AILab/flash-attention",
          "vendor": "Dao-AILab",
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              "version": "0",
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        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
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          "url": "https://github.com/Dao-AILab/flash-attention/pull/2702"
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    CVE-2026-62239 (GCVE-0-2026-62239)

    Vulnerability from cvelistv5 – Published: 2026-07-13 21:03 – Updated: 2026-07-13 21:03 X_Open Source
    VLAI
    Title
    FlashAttention Symlink Attack via tarfile.extractall in hopper/setup.py
    Summary
    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.
    Severity
    5.3 (Medium)
    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    6.6 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
    CWE
    • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
    Assigner
    References
    Impacted products
    Vendor Product Version
    Dao-AILab flash-attention Affected: 0 , ≤ 2.8.3.post1 (custom)
    Unaffected: 0816ef12f424c6ec94b057a72c275b14f6e6edb2 (git)
    		Create a notification for this product.
    Date Public
    2026-06-09 00:00
    Credits
    YU SUN
    Show details on NVD website
    To clipboard 

    {
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    "cna": {
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        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/flash_attn_2_cuda",
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            "Recovery": "NOT_DEFINED",
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