Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-40518

ByteDance DeerFlow before commit 2176b2b contains a path traversal and arbitrary file write vulnerability in bootstrap-mode custom-agent creation where the agent name validation is bypassed. Attackers can supply traversal-style values or absolute paths as the agent name to influence directory creation and write files outside the intended custom-agent directory, potentially achieving arbitrary file write on the system subject to filesystem permissions.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:397ef2ebaf5e0ec499758b4c10d7fc9a3261be953ae92f43f635f10e4346a9d2
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.1,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NO…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4119e3bed7f0a125ae3abcdc78b5dccc6b6602e94c113eb8116f6d96954ed506 · sha256:3f0da3ff4e737eb4… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4119e3bed7f0a125ae3abcdc78b5dccc6b6602e94c113eb8116f6d96954ed506 · sha256:3f0da3ff4e737eb4… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:github/bytedance/deer-flow","product":"deer-flow","repo":"https://github.com/bytedance/deer-flow","vendor":"bytedance","versions":[{"lessThan":"2176b2bbfccfce25ceee08318813f96d843a13fd","status":"affected","version":"0","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4119e3bed7f0a125ae3abcdc78b5dccc6b6602e94c113eb8116f6d96954ed506 · sha256:3f0da3ff4e737eb4… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.1,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NO…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4119e3bed7f0a125ae3abcdc78b5dccc6b6602e94c113eb8116f6d96954ed506 · sha256:3f0da3ff4e737eb4… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4119e3bed7f0a125ae3abcdc78b5dccc6b6602e94c113eb8116f6d96954ed506 · sha256:3f0da3ff4e737eb4… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-22","description":"CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4119e3bed7f0a125ae3abcdc78b5dccc6b6602e94c113eb8116f6d96954ed506 · sha256:3f0da3ff4e737eb4… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["patch"],"url":"https://github.com/bytedance/deer-flow/commit/2176b2bbfccfce25ceee08318813f96d843a13fd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4119e3bed7f0a125ae3abcdc78b5dccc6b6602e94c113eb8116f6d96954ed506 · sha256:3f0da3ff4e737eb4… · /containers/cna/references/1
{"tags":["issue-tracking"],"url":"https://github.com/bytedance/deer-flow/pull/2274"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4119e3bed7f0a125ae3abcdc78b5dccc6b6602e94c113eb8116f6d96954ed506 · sha256:3f0da3ff4e737eb4… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/bytedance-deerflow-path-traversal-and-arbitrary-file-write-via-bootstrap-mode"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4119e3bed7f0a125ae3abcdc78b5dccc6b6602e94c113eb8116f6d96954ed506 · sha256:3f0da3ff4e737eb4… · /containers/cna/references/2

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.

← Back to CVE Explorer