# CVE-2026-70469: Apache NiFi: Improper Handling of Case Sensitivity for Content-Encoding in HTTP Requests

> Attackers can cause excessive memory consumption in Apache NiFi by sending crafted HTTP requests with multiple or non-standard Content-Encoding headers, leading to denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Sep 2026
- **Updated:** 17 Sep 2026
- **Also known as:** BIT-nifi-2026-70469, GHSA-56vg-25rp-h2c5, MINI-fhg6-w67w-67h7

## What is CVE-2026-70469?

CVE-2026-70469 is a high-severity denial of service vulnerability in Apache Nifi, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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 memory. Upgrading to Apache NiFi 2.12.0 is the recommended mitigation, which disables decompression of gzip-encoded HTTP requests regardless of header number or encoding identifiers.

Weakness: CWE-409 (Improper Handling of Highly Compressed Data (Data Amplification))

## Which versions are affected by CVE-2026-70469?

1 open source package ship an affected version, including nifi. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `nifi` | Bitnami | From 2.11.0 | 2.12.0 |

Products: Apache Nifi.

## How do I fix CVE-2026-70469?

Upgrade nifi to 2.12.0 or later.

## Is CVE-2026-70469 being exploited?

There is no known exploitation of CVE-2026-70469 in the wild and no public exploit code.

## Other vulnerabilities in Apache Nifi

- [CVE-2018-1309](https://insights.sbomify.com/CVE-2018-1309/): Improper Restriction of XML External Entity Reference in Apache NiFi (critical 9.8)
- [CVE-2017-15697](https://insights.sbomify.com/CVE-2017-15697/): Apache NiFi XSS issue in context path handling (critical 9.8)
- [CVE-2017-5636](https://insights.sbomify.com/CVE-2017-5636/): Injection in Apache NiFi (critical 9.8)
- [CVE-2026-68981](https://insights.sbomify.com/CVE-2026-68981/): Apache NiFi: Uncontrolled Resource Consumption through Decompression of HTTP Requests (high 8.8)
- [CVE-2023-36542](https://insights.sbomify.com/CVE-2023-36542/): Apache NiFi: Potential Code Injection with Properties Referencing Remote Resources (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-70469 and fix it if it is affected.

What it is: CVE-2026-70469 is a high-severity denial of service vulnerability in Apache Nifi, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-70469 in the wild and no public exploit code.

Affected packages and fixed versions:
- nifi (Bitnami): affected from 2.11.0; fixed in 2.12.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-70469/ (Markdown: https://insights.sbomify.com/CVE-2026-70469/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-70469
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-70469
- OSV: https://osv.dev/vulnerability/CVE-2026-70469

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-70469/
Summaries are generated and may contain mistakes; the official description above is the record.