Distribution advisory
This page covers CVE-2025-27516 as tracked by PyPI (Root.io), for the package jinja2. The fix is available in version 3.1.2+aikido.8; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Attack vector: Local — a local account, shell or session on the host is needed.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Privileges required: Low — an ordinary user account is enough.
- User interaction: None — nobody has to be tricked into anything.
- Scope: Changed — a successful attack reaches components beyond the vulnerable one.
- Confidentiality impact: High — total loss, or loss the attacker controls.
- Integrity impact: High — total loss, or loss the attacker controls.
- Availability impact: High — total loss, or loss the attacker controls.
Weakness class
ROOT-APP-PYPI-CVE-2025-27516 is classified as CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when…
Affected software
ROOT-APP-PYPI-CVE-2025-27516 is recorded against 2 packages.
- jinja2 (fixed in 3.1.2+aikido.8)
- rootio-jinja2 (fixed in 3.0.1+root.io.5)
Timeline and source
Published on 5 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
Other advisories for this package
jinja2 has other advisories on record. If you are patching this one, these are worth checking on the same host:
Same weakness in other software
These advisories are the same class of weakness (CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine) in other software:
