CVE-2025-57804

CVSS

No CVSS.

h

2 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.

References

Link	Resource
https://github.com/python-hyper/h2/commit/035e9899f95e3709af098f578bfc3cd302298e3a
https://github.com/python-hyper/h2/security/advisories/GHSA-847f-9342-265h
https://lists.debian.org/debian-lts-announce/2025/09/msg00004.html

Configurations

No configuration.

History

03 Nov 2025, 19:16

Type	Values Removed	Values Added
References		() https://lists.debian.org/debian-lts-announce/2025/09/msg00004.html -

26 Aug 2025, 13:41

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-08-25 21:15

Updated : 2025-11-03 19:16

NVD link : CVE-2025-57804

Mitre link : CVE-2025-57804

CVE.ORG link : CVE-2025-57804

JSON object : View

Products Affected

No product.

CWE

CWE-93

Improper Neutralization of CRLF Sequences ('CRLF Injection')

{"id": "CVE-2025-57804", "cveTags": [], "metrics": {"cvssMetricV40": [{"type": "Secondary", "source": "[email protected]", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2025-08-25T21:15:37.983", "references": [{"url": "https://github.com/python-hyper/h2/commit/035e9899f95e3709af098f578bfc3cd302298e3a", "source": "[email protected]"}, {"url": "https://github.com/python-hyper/h2/security/advisories/GHSA-847f-9342-265h", "source": "[email protected]"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/09/msg00004.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-93"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "h2 es una implementaci\u00f3n puramente en Python de una pila de protocolos HTTP/2. Antes de la versi\u00f3n 4.3.0, una vulnerabilidad de divisi\u00f3n de solicitudes HTTP/2 permit\u00eda a los atacantes realizar ataques de contrabando de solicitudes mediante la inyecci\u00f3n de caracteres CRLF en los encabezados. Esto ocurre cuando los servidores degradan las solicitudes HTTP/2 a HTTP/1.1 sin validar correctamente los nombres/valores de los encabezados, lo que permite a los atacantes manipular los l\u00edmites de las solicitudes y eludir los controles de seguridad. Este problema se ha corregido en la versi\u00f3n 4.3.0."}], "lastModified": "2025-11-03T19:16:12.777", "sourceIdentifier": "[email protected]"}