# CVE-2026-78242: Apache APISIX sensitive information insertion in log file

Source: https://junglewise.ai/threats/cve-2026-78242-insertion-of-sensitive-information-into-log-file-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-01. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-78242 · Severity: info · Published 2026-10-01

Apache APISIX, an API gateway that routes and manages API traffic, fails to mask sensitive header values in log files under certain response structures. This can expose authentication tokens, API keys, and other sensitive request headers to anyone with access to the logs, potentially leading to account compromise or unauthorized API access.

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

## Quick answers

**Is CVE-2026-78242 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78242 being exploited in the wild.

**How severe is CVE-2026-78242?** Informational severity, published 1 October 2026.

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

**Is there a fix for CVE-2026-78242?** Yes: fixed in 3.18.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-78242 attacked?** It is attacked with local access, in a web application.

**Am I affected by CVE-2026-78242?** 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.

## How to fix

- Fixed in 3.18.0

## Technical details

The data-mask feature in Apache APISIX fails to properly redact sensitive request headers in logger output when certain response structures are present. An authenticated local attacker with log file access can read unmasked header values that should have been redacted, gaining exposure to sensitive credentials and authentication data.

## Affected products

- Apache APISIX 3.17.0

## Timeline

- 2026-10-01: disclosed

## References

- [https://lists.apache.org/thread.html/qxzsyw1pbgxg4sqkc4t2g8h4w2q0mvsn](https://lists.apache.org/thread.html/qxzsyw1pbgxg4sqkc4t2g8h4w2q0mvsn)
- [http://www.openwall.com/lists/oss-security/2026/10/01/2](http://www.openwall.com/lists/oss-security/2026/10/01/2)

## Related threats

- [Apache APISIX improper authentication in openid-connect plugin](https://junglewise.ai/threats/cve-2026-94276-improper-authentication-vulnerability-in-apache-apisix-on-a-route)
- [Apache APISIX authorization bypass via non-canonical URL paths](https://junglewise.ai/threats/cve-2026-94269-use-of-non-canonical-url-paths-for-authorization-decisions)
- [Apache APISIX batch-requests plugin uncontrolled resource allocation](https://junglewise.ai/threats/cve-2026-94250-allocation-of-resources-without-limits-or-throttling)
- [Apache APISIX feishu-auth and dingtalk-auth session fixation](https://junglewise.ai/threats/cve-2026-94220-cross-site-request-forgery-csrf-vulnerability-in-feishu-auth-and)
- [Apache APISIX cryptographic signature verification bypass in saml-auth](https://junglewise.ai/threats/cve-2026-94212-improper-verification-of-cryptographic-signature-vulnerability-in)