CVE-2025-11563: wcurl path traversal with percent-encoded slashes

Severity: medium (CVSS 4.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-25 · updated 2026-06-17
Weakness: CWE-22

Description

URLs containing percent-encoded slashes (`/` or `\`) can trick wcurl into saving the output file outside of the current directory without the user explicitly asking for it. This flaw only affects the wcurl command line tool.

Affected products

curl Wcurl: from 2024-12-08 before 2025-11-09 — fixed in 2025-11-09

How to fix

Upgrade to a fixed version: curl Wcurl 2025-11-09. Check the vendor advisory for mitigations.

References

https://curl.se/docs/CVE-2025-11563.html
https://curl.se/docs/CVE-2025-11563.json
http://www.openwall.com/lists/oss-security/2025/11/04/1
https://lists.debian.org/debian-release/2025/11/msg00504.html

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