CVE-2026-104827 ReactPHP react/http - Denial of Service

ReactPHP react/http 1.0.0 to 1.11.1 contains a denial of service caused by unbounded response-header buffering in ClientRequestStream::handleData(), letting remote servers exhaust PHP memory and crash processes, exploit requires attacker-controlled URLs.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
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
15 October 2026
Updated
16 October 2026
Weakness
CWE-770

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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