CVE-2026-27135
nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · March 19, 2026
Updated · October 16, 2026
Description
A flaw was found in nghttp2. Due to missing internal state validation, the library continues to process incoming data even after a session has been terminated. A remote attacker could exploit this by sending a specially crafted HTTP/2 frame, leading to an assertion failure and a denial of service (DoS).
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-617 · Reachable Assertion