CVE-2026-93491CWE-770denial-of-service

CVE-2026-93491

High · published September 18, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
53.9
In the wild
Unconfirmed
What it is

A flaw was found in Netty's HttpServerCodec. A remote, unauthenticated attacker can exploit this vulnerability by pipelining HTTP/1.1 requests on a single connection and withholding reads. This action causes the methodOverflowQueue to grow without limit, leading to unbounded heap memory consumption and a denial of service due to memory exhaustion.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00734 · 53.9th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-09-18T17:18Z
References (8)
https://access.redhat.com/errata/RHSA-2026:69440 · [email protected]https://access.redhat.com/errata/RHSA-2026:69470 · [email protected]https://access.redhat.com/errata/RHSA-2026:70257 · [email protected]https://access.redhat.com/errata/RHSA-2026:83612 · [email protected]https://access.redhat.com/security/cve/CVE-2026-93491 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2536891 · [email protected]https://github.com/netty/netty/releases/tag/netty-4.1.138.Final · [email protected]https://github.com/netty/netty/releases/tag/netty-4.2.18.Final · [email protected]
EPSS history
Timeline
  • 20 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 18 SEP 12:43Z
    Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 pipeline queue
    cvelistv5