CVE-2025-6985Network attack vector

File disclosure via unrestricted custom XSLT parsing

Published Oct 6, 2025 · Updated Oct 6, 2025

XXE in LangChain Text Splitters before 0.3.9 allows remote attackers to read local files through HTMLSectionSplitter custom XSLT. The class passes an arbitrary stylesheet to lxml.etree.parse and lxml.etree.XSLT without entity restrictions, network blocking, or XSLT access controls. Exploitation requires an application to accept an untrusted custom stylesheet; no authentication or user interaction is otherwise required.

CVSS severity7.5
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in LangChain Text Splitters before 0.3.9 allows remote attackers to read local files through HTMLSectionSplitter custom XSLT. The class passes an arbitrary stylesheet to lxml.etree.parse and lxml.etree.XSLT without entity restrictions, network blocking, or XSLT access controls. Exploitation requires an application to accept an untrusted custom stylesheet; no authentication or user interaction is otherwise required.

The record

CVE
CVE-2025-6985
Published
Oct 6, 2025
Updated
Oct 6, 2025
Vendor
LangChain
Product
LangChain
Classifications
CWE-611, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=unspecified <=latest

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LangChain · LangChainversion=unspecified <=latest

Published CVSS scores

7.5huntr.devCVSS:3.0/AV:N/AC:L/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.

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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-611Improper Restriction of XML External Entity Reference
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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