CVE-2025-11563: URLs containing percent-encoded slashes (`/` or `\`) can trick wcurl into saving the output file outside of th

Routine

MEDIUM 4.6UPGRADE

CVE-2025-11563 is a medium-severity flaw (CVSS 4.6) affecting wcurl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.6 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-02-25
Last modified	2026-06-17

Publisher (CNA): curl · Vendor: curl

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-25 08:16 UTCPublished CVE record published
2026-06-17 08:30 UTCUpdated Record last modified

curl wcurl UPGRADE

Affected: >= 2024-12-08 and < 2025-11-09

Fixed in: 2025-11-09

Safe to downgrade to: a release before 2024-12-08

1. Check installed version

apt-cache policy wcurl || rpm -q wcurl || wcurl --version

2. UPGRADE to 2025-11-09 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wcurl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wcurl

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2024-12-08 (Debian / Ubuntu)

apt-cache madison wcurl sudo apt install wcurl=<VERSION_BEFORE_2024-12-08> sudo apt-mark hold wcurl

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wcurl sudo dnf downgrade wcurl-<VERSION_BEFORE_2024-12-08> sudo dnf versionlock add wcurl

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-11563?

wcurl: upgrade to 2025-11-09. Exact commands for each OS are on this page.

Is CVE-2025-11563 being exploited?

CVE-2025-11563 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-11563 affect?

CVE-2025-11563 affects wcurl. Severity is medium (CVSS 4.6). 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.

How urgent is CVE-2025-11563?

Priority 25/100. No elevated risk signals yet.

Software pages

curl vulnerabilities

References

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