CVE-2026-71554

A flaw was found in h2, a Python library for HTTP/2. This vulnerability allows a remote attacker to perform request smuggling. The library incorrectly processes HTTP/2 requests that contain more than one Host header. When these requests are downgraded to HTTP/1.1 by a consuming application, the...

openSUSE 16 Security Update : python-h2 (openSUSE-SU-2026:21693-1)

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:21693-1 advisory. This update for python-h2 fixes the following issue: - CVE-2026-71554: duplicate Host headers are accepted and forwarded to consuming applications, whic...

Malicious code in h2-codex (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector 0176fe223a6df20d633d05a3e0ab21c2e87d0169342e820beadccc5817acc7bc The package was found to contain malicious code or consuming dependency that contains malicious code Source: ghsa-malware...

MAL-2026-15583 Malicious code in h2-codex (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector 0176fe223a6df20d633d05a3e0ab21c2e87d0169342e820beadccc5817acc7bc The package was found to contain malicious code or consuming dependency that contains malicious code Source: ghsa-malware...

OPENSUSE-SU-2026:21693-1 Security update for python-h2

This update for python-h2 fixes the following issue: - CVE-2026-71554: duplicate Host headers are accepted and forwarded to consuming applications, which can lead to request smuggling bsc1274386...

Astra Linux – Vulnerability in h2database

The H2 Console before version 2.1.210 allowed remote attackers to execute arbitrary code through a jdbc:h2:mem JDBC URL that contained the IGNOREUNKNOWNSETTINGS=TRUE;FORBID CREATION=FALSE;INIT=RUNSCRIPT substring. This is a different vulnerability than CVE-2021-42392. source-iocs-preserved...

a-gpt (>=0.1.0, <=0.4.0), a11ywatch_cli (>=0.0.16, <=0.10.15) +13708 more potentially affected by unknown CVE via h2 (>=0.1.26, <=0.3.27)

h2 CARGO version =0.1.26, =0.1.0, =0.0.16, =0.2.0, =0.1.0, =0.2.1, =0.1.0, =0.1.0, =0.1.0, =0.1.0, =0.1.0, =0.2.0-beta.4, =0.2.0-beta.7 and more Source cves: unknown CVE Source advisory: OSV:RUSTSEC-2026-0258...

python313-h2-4.4.1-1.1 on GA media (moderate)

python313-h2-4.4.1-1.1 on GA media Announcement ID: openSUSE-SU-2026:11523-1 Rating: moderate Cross-References: CVE-2026-71554 CVSS scores: CVE-2026-71554 SUSE : 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Affected Products: openSUSE Tumbleweed An update that solves one vulnerability can now...

OPENSUSE-SU-2026:11523-1 python313-h2-4.4.1-1.1 on GA media

These are all security issues fixed in the python313-h2-4.4.1-1.1 package on the GA media of openSUSE Tumbleweed...

PT-2026-76449

These are all security issues fixed in the python313-h2-4.4.1-1.1 package on the GA media of openSUSE Tumbleweed...

Exploit for Deserialization of Untrusted Data in Metabase

CVE-2026-59827: Metabase Unsafe Deserialization in H2 Native Q...

Metabase 0.63.4 SQL Injection

A proof of concept exploit for an unauthenticated SQL injection vulnerability in Metabase version 0.63.4. The vulnerability allows an attacker-controlled user-id value supplied to the password reset endpoint to reach a HoneySQL query as raw SQL. On installations using the default embedded H2...

Exploit for CVE-2026-71554

CVE-2026-71554 - h2 Duplicate Host Header Request Smuggling Pr...

CVE-2026-17603

Nexus Repository 3 did not sufficiently restrict which HikariCP connection-pool properties could be set through the DataStore configuration API. A user holding the nx-datastores-update permission could set the connectionInitSql property to execute arbitrary SQL against the configured database on...

EUVD-2026-54513

Nexus Repository 3 did not sufficiently restrict which HikariCP connection-pool properties could be set through the DataStore configuration API. A user holding the nx-datastores-update permission could set the connectionInitSql property to execute arbitrary SQL against the configured database on...

Linux Distros Unpatched Vulnerability : CVE-2026-71554

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host...

CVE-2026-71554

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host header, and forward every Host header to the consuming application. Where the consumer downgrades HTTP/2 to HTTP/1.1, the resulting request...

HTTP Request Smuggling

Overview h2 is a Pure-Python HTTP/2 protocol implementation Affected versions of this package are vulnerable to HTTP Request Smuggling via the processing of HTTP/2 request headers containing multiple Host headers. An attacker can interfere with downstream HTTP/1.1 applications by crafting request...

CVE-2026-71554 h2: Duplicate Host header could facilitate request smuggling

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host header, and forward every Host header to the consuming application. Where the consumer downgrades HTTP/2 to HTTP/1.1, the resulting request...

Security Bulletin: IBM Maximo Application Suite uses httpcore5-h2-5.3.4.jar which is vulnerable to CVE-2026-54428

Summary IBM Maximo Application Suite uses httpcore5-h2-5.3.4.jar which is vulnerable to CVE-2026-54428. This bulletin contains information regarding the vulnerability and its fixture. Vulnerability Details CVEID:CVE-2026-54428 DESCRIPTION: Allocation of resources without limits or throttling in t...