CVE-2026-78242 Apache APISIX: data-mask may fail to redact request headers in logger output
Attackers can view unmasked sensitive request headers in logs due to a data-mask plugin failure in Apache APISIX.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-78242?
CVE-2026-78242 is a medium-severity vulnerability in Apache APISIX, published on 1 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Insertion of sensitive information into log file vulnerability in Apache APISIX.
This vulnerability can cause the unmasked header value to be written to the log sink under a certain response structure.
This issue affects Apache APISIX: 3.17.0.
Users are recommended to upgrade to version 3.18.0, which fixes the issue.
Weakness: CWE-532
Which versions are affected by CVE-2026-78242?
1 open source package ship an affected version, including apisix.
| Package | Affected | Fixed in |
|---|---|---|
apisix Bitnami | From 3.17.0 | 3.18.0 |
How do I fix CVE-2026-78242?
Upgrade apisix to 3.18.0 or later.
Is CVE-2026-78242 being exploited?
There is no known exploitation of CVE-2026-78242 in the wild and no public exploit code.
Sources
Also known as BIT-apisix-2026-78242, GHSA-6wpw-9w4j-xv6c, MINI-5qhj-xfmw-cwq4.