HTTP Response Splitting Affecting elasticsearch-9.1-advanced-compat package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-ELASTICSEARCH91ADVANCEDCOMPAT-16701694
- published16 May 2026
- disclosed13 May 2026
Introduced: 13 May 2026
NewCVE-2026-42578 (opens in a new tab)How to fix?
There is no fixed version for Minimos:latest elasticsearch-9.1-advanced-compat.
NVD Description
Note: Versions mentioned in the description apply only to the upstream elasticsearch-9.1-advanced-compat package and not the elasticsearch-9.1-advanced-compat package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.