Arbitrary file read via unrestricted Jinja2 directives
Published Sep 12, 2025 · Updated Nov 3, 2025
Server-side template injection in LangChainGo 0.1.14 allows remote attackers to read arbitrary server files through crafted prompts. The prompts Jinja2 renderer passes untrusted template text to Gonja, whose include, from, and extends directives resolve paths against the host filesystem without a restricted filesystem context. Reachability requires an application to place attacker-controlled prompt content in that renderer; successful exploitation discloses files readable by the application process.
Summary
What happened
Server-side template injection in LangChainGo 0.1.14 allows remote attackers to read arbitrary server files through crafted prompts. The prompts Jinja2 renderer passes untrusted template text to Gonja, whose include, from, and extends directives resolve paths against the host filesystem without a restricted filesystem context. Reachability requires an application to place attacker-controlled prompt content in that renderer; successful exploitation discloses files readable by the application process.
The record
- CVE
- CVE-2025-9556
- Published
- Sep 12, 2025
- Updated
- Nov 3, 2025
- Vendor
- LangChainGo
- Product
- LangChainGo
- Classifications
- CWE-200, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 12, 2025CVE publishedPublication date reported by the CVE source.
- Nov 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?
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- Affected versionversion=0.1.14
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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