CVE-2026-93492

CVE-2026-93492

Medium · published September 18, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
29.9
In the wild
Unconfirmed
What it is

A flaw was found in Netty's HTTP/2 HpackEncoder. A remote attacker can exploit this by sending HTTP/2 SETTINGS frames with a very large MAX_HEADER_TABLE_SIZE. This causes the HpackEncoder to store an excessive number of unique headers, leading to increased CPU usage and memory consumption, ultimately resulting in a Denial of Service (DoS).

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00371 · 29.9th percentile
Published
2026-09-18T17:18Z
References (5)
https://bugzilla.redhat.com/show_bug.cgi?id=2536895 · [email protected]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-2026:83612 · [email protected]https://access.redhat.com/security/cve/CVE-2026-93492 · [email protected]
EPSS history
Timeline
  • 20 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 18 SEP 12:49Z
    Io.netty/netty-codec-http2: netty: http/2 hpackencoder dos with large table size
    cvelistv5