CVE-2026-103471
restbed through 5.0.0 Denial of Service via Unbounded Header Buffering
Corvusoft restbed
CVSS
8.7HighExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 30 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.55%Chance of exploitation activity in the next 30 days, higher than 45% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
Description
restbed through 5.0.0 buffers HTTP request headers without enforcing a maximum size limit, allowing remote unauthenticated attackers to exhaust server memory. Attackers can open TCP connections and stream bytes indefinitely without sending the header delimiter, forcing the server to allocate unbounded heap memory until the process is killed.
Text from CVE List
Affected versions 1
- restbedaffected: all versions through 5.0.0CVE List
References 5
- vulncheck.com/advisories/restbed-through-5.0.0-denial-of-service-via-unbounded-header-bufferingAdvisoryvia CVE List
- github.com/Corvusoft/restbed/issues/558Exploitvia CVE List
- github.com/Corvusoft/restbedReferencevia CVE List
- github.com/Corvusoft/restbed/blob/e1227a297ce6d4e9f78222456507b29bb8ab77e9/src/corvusoft/restbed/detail/service_impl.cpp#L554Referencevia CVE List
- github.com/Corvusoft/restbed/blob/e1227a297ce6d4e9f78222456507b29bb8ab77e9/src/corvusoft/restbed/session.cpp#L200Referencevia CVE List