CVE-2026-82561: Apache NiFi 1.5.0 through 2.11.0 provide REST API methods that replace the entire contents of a Process Group

Routine

MEDIUM 6.5WATCHLISTUPGRADE

CVE-2026-82561 is a medium-severity flaw (CVSS 6.5) affecting nifi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apache NiFi 1.5.0 through 2.11.0 provide REST API methods that replace the entire contents of a Process Group using a client-supplied flow definition, covering Process Group flow replacement together with versioned flow update and rebase operations. Framework authorization for these methods was limited to read and write privileges on the Process Group itself, unlike the corresponding asynchronous update request methods, which also authorize the c

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-09-16
Last modified	2026-09-21

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

Last updated 2026-09-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-16 20:17 UTCPublished CVE record published
2026-09-21 13:54 UTCUpdated Record last modified

apache nifi UPGRADE

Affected: >= 1.5.0 and < 2.12.0

Fixed in: 2.12.0

Safe to downgrade to: a release before 1.5.0

1. Check installed version

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

2. UPGRADE to 2.12.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nifi

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 1.5.0 (Debian / Ubuntu)

apt-cache madison nifi sudo apt install nifi=<VERSION_BEFORE_1.5.0> sudo apt-mark hold nifi

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

dnf --showduplicates list nifi sudo dnf downgrade nifi-<VERSION_BEFORE_1.5.0> sudo dnf versionlock add nifi

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-2026-82561?

nifi: upgrade to 2.12.0. Exact commands for each OS are on this page.

Is CVE-2026-82561 being exploited?

CVE-2026-82561 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-2026-82561 affect?

CVE-2026-82561 affects nifi. Severity is medium (CVSS 6.5). Apache NiFi 1.5.0 through 2.11.0 provide REST API methods that replace the entire contents of a Process Group using a client-supplied flow definition, covering Process Group flow replacement together with versioned flow update and rebase op

How urgent is CVE-2026-82561?

Priority 38/100. On your watchlist

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References

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