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CVE-2026-93492

Io.netty/netty-codec-http2: netty: http/2 hpackencoder dos with large table size

CVSS 3.1 5.3 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-93492

Published

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).

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Affected versions, risk and source history

Exploitation and risk

Source status

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cve-program · CVE-2026-93492

Published

Io.netty/netty-codec-http2: netty: http/2 hpackencoder dos with large table size

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).

Source published
18 Sep 2026 12:49:03 UTC
Source modified
6 Nov 2026 17:32:47 UTC
Saved here
6 Nov 2026 19:02:40 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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Sources read 15 Nov 13:16 UTC · 255 of 275 readable · 250 fully read · documentation 469/469 current

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