CVE-2026-45205: Uncontrolled Recursion vulnerability in Apache Commons. When processing an untrusted configuration file, Comm

Routine

MEDIUM 5.3REMOTEWATCHLISTUPGRADE

CVE-2026-45205 is a medium-severity flaw (CVSS 5.3) affecting commons configuration. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Uncontrolled Recursion vulnerability in Apache Commons. When processing an untrusted configuration file, Commons Configuration will throw a StackOverflowError for YAML input with cycles. This issue affects Apache Commons: from 2.2 before 2.15.0. Users are recommended to upgrade to version 2.15.0, which fixes the issue.

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-674
Published	2026-05-14
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-14 12:16 UTCPublished CVE record published
2026-10-26 14:10 UTCUpdated Record last modified

apache commons configuration UPGRADE

Affected: >= 2.2 and < 2.15.0

Fixed in: 2.15.0

Safe to downgrade to: a release before 2.2

1. Check installed version

apt-cache policy commons-configuration || rpm -q commons-configuration || commons-configuration --version

2. UPGRADE to 2.15.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade commons-configuration

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade commons-configuration

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 2.2 (Debian / Ubuntu)

apt-cache madison commons-configuration sudo apt install commons-configuration=<VERSION_BEFORE_2.2> sudo apt-mark hold commons-configuration

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

dnf --showduplicates list commons-configuration sudo dnf downgrade commons-configuration-<VERSION_BEFORE_2.2> sudo dnf versionlock add commons-configuration

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-2026-45205?

commons configuration: upgrade to 2.15.0. Exact commands for each OS are on this page.

Is CVE-2026-45205 being exploited?

CVE-2026-45205 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-2026-45205 affect?

CVE-2026-45205 affects commons configuration. Severity is medium (CVSS 5.3). Uncontrolled Recursion vulnerability in Apache Commons. When processing an untrusted configuration file, Commons Configuration will throw a StackOverflowError for YAML input with cycles. This issue affects Apache Commons: from 2.2 before 2

How urgent is CVE-2026-45205?

Priority 39/100. Remotely exploitable, no login, no user action; On your watchlist

References

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