CVE Explorer

CVE-2026-62239

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 PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:22b28ffc59edfedc2436c71c21f8f72faaf8232f17a3c35bff067a70e0f89d34

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":6.6,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","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","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpa…

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","packageURL":"pkg:pypi/flash_attn_2_cuda","product":"flash-attention","repo":"https://github.com/Dao-AILab/flash-attention","vendor":"Dao-AILab","versions":[{"lessThanOrEqual":"2.8.3.post1","status":"affected","version":"0","versionType":"custom"},{"status":"unaffected","version":"0816ef12f424c6ec94b057a72c275b14f6e6edb2","versionType":"git"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/metrics/1/cvssV3_1

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-59","description":"Improper Link Resolution Before File Access ('Link Following')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions

{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/Dao-AILab/flash-attention/commit/0816ef12f424c6ec94b057a72c275b14f6e6edb2"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/references/2

{"name":"Researcher Disclosure","tags":["technical-description","exploit","issue-tracking"],"url":"https://github.com/Dao-AILab/flash-attention/issues/2637"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/references/0

{"tags":["exploit"],"url":"https://github.com/Dao-AILab/flash-attention/issues/2637"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/adp/0/references/0

{"name":"Pull Request","tags":["issue-tracking","patch"],"url":"https://github.com/Dao-AILab/flash-attention/pull/2702"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/references/1

{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/flashattention-symlink-attack-via-tarfile-extractall-in-hopper-setup-py"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1774d2c08c6b5f97e1788e0d8dbfd400a531a514f6cb3b6e626a22865faf48e3 · sha256:ce73f18010b68a3e… · /containers/cna/references/3

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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