PT-2026-60605 · H2O · H2O

CVE-2026-54340 · Publicado 2026-07-16 · Atualizado 2026-07-17

NVD

CVSS v3.1

7.5

Alta

Vetor base

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 9265bdd, there is an HTTP/2 state amplification issue that combines HPACK decompression amplification with Slowloris-style stream stalling. Amplified decoded header state can be retained by stalled HTTP/2 streams, and depending on the configuration, additional limits are needed to bound decoded header state and prevent attack. This issue has been fixed by commit 9265bdd.

Correção

Allocation of Resources Without Limits

Resource Exhaustion

Enumeração de Fraquezas

CWE-770

CWE-400

Identificadores relacionados

CVE-2026-54340

Produtos afetados

H2O

Referências · 3

• https://github.com/h2o/h2o/security/advisories/GHSA-qcrr-wrhc-pgq9 · Nota
• https://github.com/h2o/h2o/commit/9265bdd9a996ed992681055e3996baf3e09d2063 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-54340 · Nota de Segurança