CVE-2025-65106

LangChain Vulnerable to Template Injection via Attribute Access in Prompt Templates

HIGH

8.3

CVSS Score

Published: November 21, 2025 at 09:43 PM UTC

Updated: October 19, 2026 at 01:10 PM UTC

1 product affected across 1 vendorLangChain

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Severity

HIGH8.3

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

Description

LangChain is a framework for building agents and LLM-powered applications. From versions 0.3.79 and prior and 1.0.0 to 1.0.6, a template injection vulnerability exists in LangChain's prompt template system that allows attackers to access Python object internals through template syntax. This vulnerability affects applications that accept untrusted template strings (not just template variables) in ChatPromptTemplate and related prompt template classes. This issue has been patched in versions 0.3.80 and 1.0.7.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

LangChain · Langchain AI

90%

v < 0.3.80>= 1.0.0, < 1.0.7

Affected range stops below 0.3.80, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.0.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM

Source: cverecord

https://github.com/langchain-ai/langchain/security/advisories/GHSA-6qv9-48xg-fc7f

x_refsource_MISC

Source: cverecord

https://github.com/langchain-ai/langchain/commit/c4b6ba254e1a49ed91f2e268e6484011c540542a

x_refsource_MISC

Source: cverecord

https://github.com/langchain-ai/langchain/commit/fa7789d6c21222b85211755d822ef698d3b34e00

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.3HIGHGitHub_M

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-1336

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