CVE-2026-84997 ReactPHP react/http - Denial of Service

ReactPHP react/http 0.6.0 to 1.11.1 contains a denial of service caused by infinite loop in ChunkedDecoder processing malformed Transfer-Encoding: chunked bodies, letting malicious clients or servers freeze the server or client, exploit requires sending malformed chunked bodies.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.66% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-835

Vendor fix

Update to version 1.11.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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