CVE-2026-70469: Apache NiFi 2.11.0 disabled support for gzip-encoded HTTP requests for the application REST API and rejected r

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HIGH 7.5REMOTEWATCHLISTDOWNGRADE

CVE-2026-70469 is a high-severity flaw (CVSS 7.5) affecting nifi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apache NiFi 2.11.0 disabled support for gzip-encoded HTTP requests for the application REST API and rejected requests that included the standard Content-Encoding header indicating gzip encoding. The framework enforcement filter did not check multiple instances of the Content-Encoding header and did not reject non-standard identifiers for gzip encoding, allowing a malicious client to send crafted requests that could consume excessive amounts of me

Why this priority

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

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-409
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 13:42 UTCUpdated Record last modified

apache nifi DOWNGRADE

Affected: 2.11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.11.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.11.0 (Debian / Ubuntu)

apt-cache madison nifi sudo apt install nifi=<VERSION_BEFORE_2.11.0> sudo apt-mark hold nifi

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nifi sudo dnf downgrade nifi-<VERSION_BEFORE_2.11.0> 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-2026-70469?

nifi: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-70469 being exploited?

CVE-2026-70469 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-2026-70469 affect?

CVE-2026-70469 affects nifi. Severity is high (CVSS 7.5). Apache NiFi 2.11.0 disabled support for gzip-encoded HTTP requests for the application REST API and rejected requests that included the standard Content-Encoding header indicating gzip encoding. The framework enforcement filter did not chec

How urgent is CVE-2026-70469?

Priority 49/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

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References

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