Catálogo de CVE

CVE-2025-57804

python-h2 affected and fixed versions

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request boundaries and bypass security controls. This issue has been patched in version 4.3.0.

Gravidade: Medium · CVSS 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published: Aug 25, 2025, 9:04:52 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.80% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiansid	python-h2	`4.3.0-1`	FixedDistribution-reported fixed boundary	[CVE-2025-57804]
Debiansid	python-h2	`4.3.0-2`	Fixed	[CVE-2025-57804]
Debianforky	python-h2	`4.3.0-1`	FixedDistribution-reported fixed boundary	[CVE-2025-57804]
Debianforky	python-h2	`4.3.0-2`	Fixed	[CVE-2025-57804]

Showing 4 fix observations. All 32 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	python-h2	Not reported	UnknownSource applicability is not established	Provider not reported
Debianbookworm	python-h2	Not reported	AffectedDistribution reports no fix	[CVE-2025-57804]
Debianbookworm	python-h2	`4.1.0-4`	Affected	[CVE-2025-57804]
Debianforky	python-h2	`4.3.0-1`	FixedDistribution-reported fixed boundary	[CVE-2025-57804]
Debianforky	python-h2	`4.3.0-2`	Fixed	[CVE-2025-57804]
Debiansid	python-h2	`4.3.0-1`	FixedDistribution-reported fixed boundary	[CVE-2025-57804]
Debiansid	python-h2	`4.3.0-2`	Fixed	[CVE-2025-57804]
Debiantrixie	python-h2	Not reported	AffectedDistribution reports no fix	[CVE-2025-57804]
Debiantrixie	python-h2	`4.2.0-1`	Affected	[CVE-2025-57804]
Opensuseleap 15.6	python-h2	`4.1.0-150400.8.6.1`	UnknownSource applicability is not established	[SUSE-SU-2025:03199-1]Mar 23, 2026, 4:49:55 AM UTC
Opensuseleap 16.0	python-h2	`4.2.0-160000.3.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2026:20122-1]Mar 23, 2026, 4:54:45 AM UTC
Opensusetumbleweed	python-h2	`4.3.0-1.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2025:15496-1]Mar 23, 2026, 4:53:51 AM UTC
Suselinux enterprise module for python 3 15 sp6	python-h2	`4.1.0-150400.8.6.1`	UnknownSource applicability is not established	[SUSE-SU-2025:03199-1]Mar 23, 2026, 4:49:55 AM UTC
Suselinux enterprise module for python 3 15 sp7	python-h2	`4.1.0-150400.8.6.1`	UnknownSource applicability is not established	[SUSE-SU-2025:03199-1]Mar 23, 2026, 4:49:55 AM UTC
Suselinux enterprise module for server applications 15 sp6	python-h2	`3.2.0-150200.3.5.1`	UnknownSource applicability is not established	[SUSE-SU-2025:03273-1]Mar 23, 2026, 4:48:46 AM UTC
Suselinux enterprise module for server applications 15 sp7	python-h2	`3.2.0-150200.3.5.1`	UnknownSource applicability is not established	[SUSE-SU-2025:03273-1]Mar 23, 2026, 4:48:46 AM UTC
Suselinux enterprise server 16.0	python-h2	`4.2.0-160000.3.1`	UnknownSource applicability is not established	[SUSE-SU-2026:20187-1]Mar 23, 2026, 4:52:41 AM UTC
Suselinux enterprise server for sap applications 16.0	python-h2	`4.2.0-160000.3.1`	UnknownSource applicability is not established	[SUSE-SU-2026:20187-1]Mar 23, 2026, 4:52:41 AM UTC
Ubuntu18.04	python-h2	`3.0.1-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu18.04	python-h2	`3.0.1-2`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu18.04	python-h2	`3.0.1-3`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu20.04	python-h2	`3.0.1-4`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu20.04	python-h2	`3.0.1-4.1ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu20.04	python-h2	`3.0.1-5`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu20.04	python-h2	`3.1.1-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu22.04	python-h2	`4.0.0-3`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu22.04	python-h2	`4.1.0-3ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu24.04	python-h2	`4.1.0-4`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu25.10	python-h2	`4.1.0-4`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu25.10	python-h2	`4.2.0-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu26.04	python-h2	`4.2.0-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC
Ubuntu26.04	python-h2	`4.3.0-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2025-57804]May 20, 2026, 4:23:37 PM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "python-h2",
      "status": "fixed",
      "release": "sid",
      "version": "4.3.0-2"
    },
    {
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      "status": "fixed",
      "release": "forky",
      "version": "4.3.0-2"
    },
    {
      "name": "python-h2",
      "status": "vulnerable",
      "release": "trixie",
      "version": "4.2.0-1"
    },
    {
      "name": "python-h2",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "4.1.0-4"
    }
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  "fixed_versions": [
    {
      "bug": 1112348,
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    },
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    },
    {
      "bug": 1112348,
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      "type": "source",
      "origin": null,
      "release": "trixie",
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      "fixed_version": ""
    },
    {
      "bug": 1112348,
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    }
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      "ecosystem": "deb",
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      "release": "leap 16.0",
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        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2025:15496-1",
      "fixed_version": "4.3.0-1.1",
      "provider_source": "pypi",
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          ]
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      ],
      "release": "linux enterprise server 16.0",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2026:20187-1",
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      "versions": [],
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      "applicability_unknown": true
    }
  ]
}

[Debian bug #1112348]

Publisher notes

[trixie] python-h2: Minor issue [bookworm] python-h2: Minor issue

OpenFactory catalog packages

A associação de pacotes está em andamento.

[Debian 12 (Bookworm)]

[python3-h2]Desconhecido
Pacote fonte: [python-h2]
Detalhes (2)
- 4.1.0-4 · all · bookworm
  Afetada
  dsa · python-h2 · debian · bookworm; dsa · python-h2 · debian · 12
- 4.1.0-4 · all · bookworm
  Afetada
  dsa · python-h2 · debian · bookworm; dsa · python-h2 · debian · 12

[Debian 13 (Trixie)]

[python3-h2]Desconhecido
Pacote fonte: [python-h2]
Detalhes (2)
- 4.2.0-1 · all · trixie
  Afetada
  dsa · python-h2 · debian · 13
- 4.2.0-1 · all · trixie
  Afetada
  dsa · python-h2 · debian · 13

[openSUSE Tumbleweed]

[python313-h2]Desconhecido
Pacote fonte: [python-h2]
Detalhes (1)
- 4.4.1-1.1 · noarch · tumbleweed
  Desconhecido · Corrigida: 4.3.0-1.1
  Version impact unknown
  dsa · python-h2 · opensuse · tumbleweed
[python314-h2]Desconhecido
Pacote fonte: [python-h2]
Detalhes (1)
- 4.4.1-1.1 · noarch · tumbleweed
  Desconhecido · Corrigida: 4.3.0-1.1
  Version impact unknown
  dsa · python-h2 · opensuse · tumbleweed

Observado: Oct 24, 2026, 7:23:49 PM UTC

Referências

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]