CVE-2026-91920
Undertow: undertow: chunkreader message length permits chunk-size overflow
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-444 |
| Vendor | red hat |
| Product | red hat build of apache camel for spring boot 4 |
| Published | Oct 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
Red Hat / Red Hat build of Apache Camel for Spring Boot 4
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Fuse 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack
All versions affected Red Hat / Red Hat Single Sign-On 7
All versions affected References
Credits
Red Hat would like to thank Arpit Jain for reporting this issue.