CVE-2025-55201

Copier safe template has arbitrary filesystem read/write access

HIGH
8.5
CVSS Score
Published: August 18, 2025 at 04:21 PM UTC
Updated: June 17, 2026 at 09:41 AM UTC
1 product affected across 1 vendorCopier

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Severity
HIGH8.5
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

Copier library and CLI app for rendering project templates. Prior to 9.9.1, a safe template can currently read and write arbitrary files because Copier exposes a few pathlib.Path objects in the Jinja context which have unconstrained I/O methods. This effectively renders the security model w.r.t. filesystem access useless. This vulnerability is fixed in 9.9.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 9.9.1
Affected range stops below 9.9.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.5HIGHGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-22

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