CVE-2025-59829Network attack vector

Denied-file access via unresolved symbolic links

Published Oct 3, 2025 · Updated Oct 3, 2025

Permission bypass in Anthropic Claude Code before 1.0.120 allows remote attackers to access denied files through symbolic links. The permission deny-rule check does not account for a link's resolved target, allowing an accepted link path to reference an explicitly denied file. Exploitation requires an explicitly denied file and an accessible symlink, and the consequence is access to that file despite the deny rule.

CVSS severity2.3
Low
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Permission bypass in Anthropic Claude Code before 1.0.120 allows remote attackers to access denied files through symbolic links. The permission deny-rule check does not account for a link's resolved target, allowing an accepted link path to reference an explicitly denied file. Exploitation requires an explicitly denied file and an accessible symlink, and the consequence is access to that file despite the deny rule.

The record

CVE
CVE-2025-59829
Published
Oct 3, 2025
Updated
Oct 3, 2025
Vendor
Anthropic
Product
Claude Code
Classifications
CWE-61, CAPEC-27, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.120

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Anthropic · Claude Codeversion=< 1.0.120

Published CVSS scores

2.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-61UNIX Symbolic Link (Symlink) Following
CAPEC-27Leveraging Race Conditions via Symbolic Links
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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