# CVE-2026-74848: Apache APISIX HTTP request smuggling in serverless plugins

Source: https://junglewise.ai/threats/cve-2026-74848-apache-apisix-http-request-smuggling-in-serverless-plugins  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-27. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-74848 · Severity: high · CVSS 7.5 · Published 2026-08-27

Apache APISIX is an API gateway that manages and routes incoming web requests. An HTTP request smuggling vulnerability in the serverless plugin component allows attackers to cause other users to receive incorrect or malicious responses, potentially leading to data leakage or session hijacking. This could affect any organization running APISIX as their API management layer.

Technologies: [Apache APISIX](https://junglewise.ai/threats/technologies/apisix). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache).

## Quick answers

**Is CVE-2026-74848 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-74848 being exploited in the wild.

**How severe is CVE-2026-74848?** High severity, with a CVSS score of 7.5, published 27 August 2026.

**Which products and versions are affected?** Apache APISIX 2.12.0 through 3.17.0.

**Is there a fix for CVE-2026-74848?** A patch was published on 2026-08-27: Fix available in version 3.18.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-74848 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-74848?** Check whether you run Apache APISIX at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is an HTTP request/response smuggling vulnerability (CWE-444) affecting the serverless-plugin route processing in Apache APISIX versions 2.12.0 through 3.17.0. The root cause is inconsistent interpretation of HTTP requests, allowing an attacker to inject malicious request data that causes subsequent clients to receive attacker-controlled or unrelated users' responses. The vulnerability is network-accessible on affected APISIX instances. Version 3.18.0 contains a fix; affected users should upgrade immediately.

## Affected products

- Apache APISIX 2.12.0 through 3.17.0

## Timeline

- 2026-08-26: disclosed: Advisory published by Apache APISIX security team
- 2026-08-27: patched: Fix available in version 3.18.0

## References

- [https://lists.apache.org/thread/xdgpszmw8dw4wvmfxy043d83m150kx3n](https://lists.apache.org/thread/xdgpszmw8dw4wvmfxy043d83m150kx3n)
- [http://www.openwall.com/lists/oss-security/2026/08/26/12](http://www.openwall.com/lists/oss-security/2026/08/26/12)

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