CVE-2025-9556 | Langchaingo supports the use of jinja2 syntax when parsing p… | CVSS 9.8 CRITICAL

Description

Langchaingo supports the use of jinja2 syntax when parsing prompts, which is in turn parsed using the gonja library v1.5.3. Gonja supports include and extends syntax to read files, which leads to a server side template injection vulnerability within langchaingo, allowing an attacker to insert a statement into a prompt to read the "etc/passwd" file.

Metadata

CVE ID: CVE-2025-9556
State: PUBLISHED
Assigner: certcc
Reserved: 2025-08-27 18:10 UTC
Published: 2025-09-12 13:45 UTC
Last updated: 2025-11-03 18:14 UTC
Vendor / Product: Langchaingo / Langchaingo
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Langchaingo	Langchaingo	—	0.1.14

Weakness (CWE)

CWE	Source	Description
—	cna	CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (2)