Code execution in Jinja

1) Input validation error

EUVDB-ID: #VU105387

Risk: Low

CVSSv4.0: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-27516

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to sandbox breakout through attr filter selecting format method. A local user can execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jinja: 3.1.0 - 3.1.5

CPE2.3

• cpe:2.3:a:palletsprojects:jinja:3.1.0:*:*:*:*:python:*:*
• cpe:2.3:a:palletsprojects:jinja:3.1.1:*:*:*:*:python:*:*
• cpe:2.3:a:palletsprojects:jinja:3.1.2:*:*:*:*:python:*:*

External links

https://github.com/pallets/jinja/commit/90457bbf33b8662926ae65cdde4c4c32e756e403
https://github.com/pallets/jinja/security/advisories/GHSA-cpwx-vrp4-4pq7

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.