VulnerabilityAnalyzed
CVE-2026-31908
Header injection vulnerability in Apache APISIX.
CRITICAL 9.1EPSS 0.52%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.52% probability · 43th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-75
- Affected
- apache/apisix
- Source
- security@apache.org
References
- https://lists.apache.org/thread/sob643s5lztov7x579j8o0c444t36n6bMailing List, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/14/3Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.