EUVD-2026-12919

| CVE-2026-27135 HIGH
2026-03-18 GitHub_M
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
PoC Detected
Mar 23, 2026 - 17:51 vuln.today
Public exploit code
Analysis Generated
Mar 18, 2026 - 18:15 vuln.today
EUVD ID Assigned
Mar 18, 2026 - 18:15 euvd
EUVD-2026-12919
CVE Published
Mar 18, 2026 - 17:59 nvd
HIGH 7.5

Tags

Denial Of Service Redhat Suse

Description

nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. Prior to version 1.68.1, the nghttp2 library stops reading the incoming data when user facing public API `nghttp2_session_terminate_session` or `nghttp2_session_terminate_session2` is called by the application. They might be called internally by the library when it detects the situation that is subject to connection error. Due to the missing internal state validation, the library keeps reading the rest of the data after one of those APIs is called. Then receiving a malformed frame that causes FRAME_SIZE_ERROR causes assertion failure. nghttp2 v1.68.1 adds missing state validation to avoid assertion failure. No known workarounds are available.

Analysis

nghttp2 before version 1.68.1 fails to properly validate internal state when session termination APIs are invoked, allowing an attacker to send a malformed frame that triggers an assertion failure and crashes the application. This denial of service vulnerability affects applications using the nghttp2 HTTP/2 library and can be triggered remotely without authentication or user interaction. …

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Remediation

Within 24 hours: inventory all systems using nghttp2 and assess exposure; identify critical services and prioritize protection. Within 7 days: implement network-layer mitigations (WAF rules blocking malformed HTTP/2 frames, rate limiting on HTTP/2 connections) and enable detailed HTTP/2 logging for attack detection. …

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +38
POC: +20

Vendor Status

Debian

nghttp2
Release Status Fixed Version Urgency
bullseye vulnerable 1.43.0-1+deb11u1 -
bullseye (security) vulnerable 1.43.0-1+deb11u2 -
bookworm vulnerable 1.52.0-1+deb12u2 -
bookworm (security) vulnerable 1.52.0-1+deb12u1 -
trixie vulnerable 1.64.0-1.1 -
forky, sid vulnerable 1.68.0-2 -
(unstable) fixed (unfixed) -

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EUVD-2026-12919 vulnerability details – vuln.today
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