CVE-2025-275165.4MediumCWE-1336

CVE-2025-27516: Jinja sandbox breakout through attr filter selecting format method

pallets · jinja

Affected: pallets jinja · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.5%probability of exploitation in the next 30 days

43rd percentile

050100

Higher than 43% of scored CVEs

5.4MediumCVSS 4.0

LowMediumHighCrit.

DescriptionCVE.org

Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that controls the content of a template to execute arbitrary Python code. To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates. Jinja's sandbox does catch calls to str.format and ensures they don't escape the sandbox. However, it's possible to use the |attr filter to get a reference to a string's plain format method, bypassing the sandbox. After the fix, the |attr filter no longer bypasses the environment's attribute lookup. This vulnerability is fixed in 3.1.6.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

pallets · jinja< 3.1.6

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Improper Neutralization of Special Elements Used in a Template Engine · Command and Code Injection
Vendor: pallets
Published: March 2025
Band: Unlikely (under 1%), March 2025

CoverageNo articles yet

No CyberSIXT article names CVE-2025-27516 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.