CVE-2026-22444: The "create core" API of Apache Solr 8.6 through 9.10.0 lacks sufficient input validation on some API paramete

This month

HIGH 7.1WATCHLISTUPGRADE

CVE-2026-22444 is a high-severity flaw (CVSS 7.1) affecting solr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The "create core" API of Apache Solr 8.6 through 9.10.0 lacks sufficient input validation on some API parameters, which can cause Solr to check the existence of and attempt to read file-system paths that should be disallowed by Solr's "allowPaths" security setting https://https://solr.apache.org/guide/solr/latest/configuration-guide/configuring-solr-xml.html#the-solr-element . These read-only accesses can allow users to create cores using unexp

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-01-21
Last modified	2026-06-17

Publisher (CNA): Apache Software Foundation · Vendor: apache

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

Am I affected?

Timeline

2026-01-21 14:16 UTCPublished CVE record published
2026-06-17 10:19 UTCUpdated Record last modified

apache solr UPGRADE

Affected: >= 8.6.0 and < 9.10.1

Fixed in: 9.10.1

Safe to downgrade to: a release before 8.6.0

1. Check installed version

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

2. UPGRADE to 9.10.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade solr

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 8.6.0 (Debian / Ubuntu)

apt-cache madison solr sudo apt install solr=<VERSION_BEFORE_8.6.0> sudo apt-mark hold solr

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

dnf --showduplicates list solr sudo dnf downgrade solr-<VERSION_BEFORE_8.6.0> sudo dnf versionlock add solr

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-2026-22444?

solr: upgrade to 9.10.1. Exact commands for each OS are on this page.

Is CVE-2026-22444 being exploited?

CVE-2026-22444 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-2026-22444 affect?

CVE-2026-22444 affects solr. Severity is high (CVSS 7.1). The "create core" API of Apache Solr 8.6 through 9.10.0 lacks sufficient input validation on some API parameters, which can cause Solr to check the existence of and attempt to read file-system paths that should be disallowed by Solr's "all

How urgent is CVE-2026-22444?

Priority 43/100. High severity; On your watchlist

Software pages

Apache Solr vulnerabilities

Related CVEs

CVE-2026-44825 HIGH 8.1 UPGRADE Hardcoded credentials in the Basic Authentication setup tool (bin/solr auth enable) in Apache Solr versions 9.
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CVE-2024-52012 MEDIUM 5.4 UPGRADE Relative Path Traversal vulnerability in Apache Solr. Solr instances running on Windows are vulnerable to arb
CVE-2024-45217 HIGH 8.1 UPGRADE Insecure Default Initialization of Resource vulnerability in Apache Solr. New ConfigSets that are created via

References

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