CVE-2026-50221: In OpenStack Swift before 2.37.2, proxy-server does not strip internal update headers (X-Container-Host, X-Con

Routine

MEDIUM 5.4UPGRADE

CVE-2026-50221 is a medium-severity flaw (CVSS 5.4) affecting swift. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In OpenStack Swift before 2.37.2, proxy-server does not strip internal update headers (X-Container-Host, X-Container-Device, X-Delete-At-Host, X-Delete-At-Device) from client requests before forwarding them to object-servers. An authenticated user with write access can inject these headers to redirect container update requests to an attacker-controlled server, enabling server-side request forgery. The SSRF requests expose internal cluster metadat

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-06-23
Last modified	2026-10-25

Publisher (CNA): MITRE · Vendor: openstack

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-23 18:18 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

openstack swift UPGRADE

Affected: >= 2.0.0 and < 2.35.3 · >= 2.36.0 and < 2.36.2 · >= 2.37.0 and < 2.37.2

Fixed in: 2.35.3, 2.36.2, 2.37.2

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. UPGRADE to 2.35.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade swift

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 2.0.0 (Debian / Ubuntu)

apt-cache madison swift sudo apt install swift=<VERSION_BEFORE_2.0.0> sudo apt-mark hold swift

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

dnf --showduplicates list swift sudo dnf downgrade swift-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add swift

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-2026-50221?

swift: upgrade to 2.35.3, 2.36.2, 2.37.2. Exact commands for each OS are on this page.

Is CVE-2026-50221 being exploited?

CVE-2026-50221 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-2026-50221 affect?

CVE-2026-50221 affects swift. Severity is medium (CVSS 5.4). In OpenStack Swift before 2.37.2, proxy-server does not strip internal update headers (X-Container-Host, X-Container-Device, X-Delete-At-Host, X-Delete-At-Device) from client requests before forwarding them to object-servers. An authenticat

How urgent is CVE-2026-50221?

Priority 27/100. Public exploit reference

Software pages

OpenStack vulnerabilities · Swift vulnerabilities

References

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