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CVE-2026-34452

The Claude SDK for Python provides access to the Claude API from Python applications. From version 0.86.0 to before version 0.87.0, the async local filesystem memory tool in the Anthropic Python SDK validated that model-supplied paths resolved inside the sandboxed memory directory, but then returned the unresolved path for subsequent file operations. A local attacker able to write to the memory directory could retarget a symlink between validation and use, causing reads or writes to escape the s
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5b93d520051fdc1571447a4a69665eb8860d6ea89f25bc80cd62768ed99fc6e7
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-59","description":"CWE-59: Improper Link Resolution Before File Access ('Link Following')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1576a082619d99b7835895676d245a121fe712c1925f9610461691d314d5a9bf · sha256:5583bf980f0e7b5f… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-367","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1576a082619d99b7835895676d245a121fe712c1925f9610461691d314d5a9bf · sha256:5583bf980f0e7b5f… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"anthropic-sdk-python","vendor":"anthropics","versions":[{"status":"affected","version":">= 0.86.0, < 0.87.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1576a082619d99b7835895676d245a121fe712c1925f9610461691d314d5a9bf · sha256:5583bf980f0e7b5f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":5.8,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1576a082619d99b7835895676d245a121fe712c1925f9610461691d314d5a9bf · sha256:5583bf980f0e7b5f… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-59","description":"CWE-59: Improper Link Resolution Before File Access ('Link Following')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1576a082619d99b7835895676d245a121fe712c1925f9610461691d314d5a9bf · sha256:5583bf980f0e7b5f… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-367","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1576a082619d99b7835895676d245a121fe712c1925f9610461691d314d5a9bf · sha256:5583bf980f0e7b5f… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/anthropics/anthropic-sdk-python/commit/6599043eee6e86dce16953fcd1fd828052052be6","tags":["x_refsource_MISC"],"url":"https://github.com/anthropics/anthropic-sdk-python/commit/6599043eee6e86dce16953fcd1fd828052052be6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1576a082619d99b7835895676d245a121fe712c1925f9610461691d314d5a9bf · sha256:5583bf980f0e7b5f… · /containers/cna/references/1
{"name":"https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0","tags":["x_refsource_MISC"],"url":"https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1576a082619d99b7835895676d245a121fe712c1925f9610461691d314d5a9bf · sha256:5583bf980f0e7b5f… · /containers/cna/references/2
{"name":"https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-w828-4qhx-vxx3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-w828-4qhx-vxx3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1576a082619d99b7835895676d245a121fe712c1925f9610461691d314d5a9bf · sha256:5583bf980f0e7b5f… · /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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