MEDIUM 6.5 NVD
CVE-2026-91920
A flaw was found in the ChunkReader component of the Undertow web server, which is used to handle chunked transfer encoding in HTTP requests. The issue occurs b
A flaw was found in the ChunkReader component of the Undertow web server, which is used to handle chunked transfer encoding in HTTP requests. The issue occurs because a security check for the chunk size is performed before the value is shifted, allowing a specifically crafted 15-digit chunk size to bypass the limit and overflow into internal state flags. This can cause the server to terminate a request body prematurely and interpret the remaining data as a separate, smuggled request.
References
- https://access.redhat.com/security/cve/CVE-2026-91920
- https://bugzilla.redhat.com/show_bug.cgi?id=2528758
This medium severity vulnerability with a CVSS score of 6.5 was published on 2026-10-30 via NVD.
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