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CVE-2025-55201VulnerabilityPublished

CVE-2025-55201: copier · Path Traversal

Affects copierSource CVE Database V5

0

Not known to be exploited · CVSS 8.5 High : upgrade to 9.9.1 soon.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 4.0 base score
8.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 17% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 9.9.1
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Aug 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

Upgrade copier to 9.9.1.

Affected software

ProductAffectedFixed in
copier-org copierAffected
  • <9.9.1
Fixed in
  • 9.9.1

AI-suggested

European organizations should immediately upgrade all instances of copier to version 9.9.1 or later to remediate this vulnerability. Until upgrades can be applied, restrict copier usage to trusted templates only and avoid rendering templates from unverified or external sources. Implement strict access controls on development and build environments to limit who can execute copier commands. Employ filesystem monitoring to detect unusual read/write operations outside expected directories during template rendering. Integrate static code analysis or template scanning tools to identify unsafe usage of pathlib.Path objects in templates. Additionally, consider sandboxing the copier execution environment to contain potential filesystem access. Regularly audit and review CI/CD pipelines and developer workstations for outdated copier versions and suspicious activity. Finally, raise awareness among developers about the risks of rendering untrusted templates.

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.

References

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