CVE-2026-44837: view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rai

This week

MEDIUM 5.9REMOTEUPGRADE

CVE-2026-44837 is a medium-severity flaw (CVSS 5.9) affecting view component. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rails. From 3.0.0 to 4.9.0, the system test entrypoint canonicalizes a user-controlled file path with File.realpath, then checks whether the resolved path starts with the temp directory path. This is not a safe containment check because sibling directories can share the same string prefix. This vulnerability is fixed in 4.9.0.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-187
Published	2026-05-26
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: viewcomponent

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-26 21:16 UTCPublished CVE record published
2026-07-24 11:10 UTCUpdated Record last modified

viewcomponent view component UPGRADE

Affected: >= 3.0.0 and < 4.9.0

Fixed in: 4.9.0

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy view-component || rpm -q view-component || view-component --version

2. UPGRADE to 4.9.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade view-component

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade view-component

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 3.0.0 (Debian / Ubuntu)

apt-cache madison view-component sudo apt install view-component=<VERSION_BEFORE_3.0.0> sudo apt-mark hold view-component

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

dnf --showduplicates list view-component sudo dnf downgrade view-component-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add view-component

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-2026-44837?

view component: upgrade to 4.9.0. Exact commands for each OS are on this page.

Is CVE-2026-44837 being exploited?

CVE-2026-44837 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-2026-44837 affect?

CVE-2026-44837 affects view component. Severity is medium (CVSS 5.9). view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rails. From 3.0.0 to 4.9.0, the system test entrypoint canonicalizes a user-controlled file path with File.realpath, then checks whet

How urgent is CVE-2026-44837?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Ruby on Rails vulnerabilities · Ruby vulnerabilities

Related CVEs

CVE-2026-54498 HIGH 8.7 UPGRADE view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rai
CVE-2026-54497 MEDIUM 6.8 UPGRADE view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rai

References

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