Claude Code Has Permission Deny Bypass Through Symbolic Links

published 2026-02-06 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-5614 , GHSA-4q92-rfm6-2cqx

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits: 0; none known

Claude Code is an agentic coding tool. Prior to version 2.1.7, Claude Code failed to strictly enforce deny rules configured in settings.json when accessing files through symbolic links. If a user explicitly denied Claude Code access to a file (such as /etc/passwd) and Claude Code had access to a symbolic link pointing to that file, it was possible for Claude Code to read the restricted file through the symlink without triggering deny rule enforcement. This issue has been patched in version 2.1.7.

Patch / fix

fixed in 2

npm @anthropic-ai/claude-code 2.1.7
anthropic claude_code 2.1.7

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 9 mo ago (2026-02-06)

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	2.3	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
CNA	4.0	2.3	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	@anthropic-ai/claude-code	<2.1.7	2.1.7

Affected products

anthropics claude-code

Classification

Weakness

CWE-61 UNIX Symbolic Link (Symlink) Following
CWE-285 Improper Authorization

References

github.com /anthropics/claude-code/security/advisories/GHSA-4q92-rfm6-2cqx
web, third-party-advisory
terra.security /blog/when-ai-becomes-the-attack-surface-lessons-from-discovering-cve-2026-25724
web
nvd.nist.gov /vuln/detail/CVE-2026-25724
advisory
github.com /anthropics/claude-code
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary