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CVE-2026-39861

Claude Code is an agentic coding tool. Prior to version 2.1.64, Claude Code's sandbox did not prevent sandboxed processes from creating symlinks pointing to locations outside the workspace. When Claude Code subsequently wrote to a path within such a symlink, its unsandboxed process followed the symlink and wrote to the target location outside the workspace without prompting the user for confirmation. This allowed a sandbox escape where neither the sandboxed command nor the unsandboxed app could
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:218b17c2d8765be151698a703fd4907bfba9acd0242ac99499ea865ffd1ad89e
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-61","description":"CWE-61: UNIX Symbolic Link (Symlink) Following","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:89fb78f7aed752f0510c420c303c21ca86d44058f8c9d9b1e332bb925b4d8dbb · sha256:e57d4bc08cfbe304… · /containers/cna/problemTypes/1/descriptions/0

{"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:v2:89fb78f7aed752f0510c420c303c21ca86d44058f8c9d9b1e332bb925b4d8dbb · sha256:e57d4bc08cfbe304… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"claude-code","vendor":"anthropics","versions":[{"status":"affected","version":"< 2.1.64"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89fb78f7aed752f0510c420c303c21ca86d44058f8c9d9b1e332bb925b4d8dbb · sha256:e57d4bc08cfbe304… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:89fb78f7aed752f0510c420c303c21ca86d44058f8c9d9b1e332bb925b4d8dbb · sha256:e57d4bc08cfbe304… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-61","description":"CWE-61: UNIX Symbolic Link (Symlink) Following","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:89fb78f7aed752f0510c420c303c21ca86d44058f8c9d9b1e332bb925b4d8dbb · sha256:e57d4bc08cfbe304… · /containers/cna/problemTypes/1/descriptions/0
{"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:v2:89fb78f7aed752f0510c420c303c21ca86d44058f8c9d9b1e332bb925b4d8dbb · sha256:e57d4bc08cfbe304… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/anthropics/claude-code/security/advisories/GHSA-vp62-r36r-9xqp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/anthropics/claude-code/security/advisories/GHSA-vp62-r36r-9xqp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89fb78f7aed752f0510c420c303c21ca86d44058f8c9d9b1e332bb925b4d8dbb · sha256:e57d4bc08cfbe304… · /containers/cna/references/0

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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