CVE-2026-55443

File disclosure via unconstrained path resolution

Published Jun 22, 2026 · Updated Jun 22, 2026

Path traversal in LangChain before 1.3.9 and langchain-anthropic before 1.4.6 allows attackers to read files outside configured roots. File-search middleware accepts escaping glob segments and follows symlinked matches, loaders resolve untrusted path fields without containment checks, and prefix authorization omits path-segment boundaries. Exploitation requires untrusted paths, patterns, configuration, or agent-controlled workspace content to reach an affected component; trusted-only callers are not affected.

CVSS severity5.1
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in LangChain before 1.3.9 and langchain-anthropic before 1.4.6 allows attackers to read files outside configured roots. File-search middleware accepts escaping glob segments and follows symlinked matches, loaders resolve untrusted path fields without containment checks, and prefix authorization omits path-segment boundaries. Exploitation requires untrusted paths, patterns, configuration, or agent-controlled workspace content to reach an affected component; trusted-only callers are not affected.

The record

CVE
CVE-2026-55443
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
LangChain
Product
LangChain
Classifications
CWE-22, CWE-59, T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record 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=< 1.3.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

LangChain · LangChainversion=< 1.3.9
LangChain · langchain-anthropicversion=< 1.4.6

Published CVSS scores

5.1GitHubCVSS:3.1/AV:L/AC:H/PR:N/UI:N/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59Improper Link Resolution Before File Access ('Link Following')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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