Vulnerability-Lookup

SUSE-SU-2025:20331-1

Vulnerability from csaf_suse - Published: 2025-05-20 08:49 - Updated: 2026-09-20 18:11

Summary

Security update for python-httpcore, python-h11

Severity

Critical

Notes

Title of the patch: Security update for python-httpcore, python-h11

Description of the patch: This update for python-httpcore, python-h11 fixes the following issues: python-h11: - Update 0.16.0: * CVE-2025-43859: Fixed accepting of malformed Chunked-Encoding bodies (bsc#1241872) - 0.15.0: * Reject Content-Lengths >= 1 zettabyte (1 billion terabytes) early, without attempting to parse the integer (#181) python-httpcore: - CVE-2025-43859: Fixed accepting of malformed Chunked-Encoding bodies (bsc#1241872)

Patchnames: SUSE-SLE-Micro-6.0-327

CVE-2025-43859

9.1 (Critical)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Recommended 2 products

Product	Identifier	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.0:python311-h11-0:0.16.0-1.1.noarch		—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:python311-httpcore-0:0.16.3-7.1.noarch		—	Vendor Fix

Threats

Impact critical

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-updates/2025…	self
https://bugzilla.suse.com/1241872	self
https://www.suse.com/security/cve/CVE-2025-43859/	self
https://www.suse.com/security/cve/CVE-2025-43859	external
https://bugzilla.suse.com/1241872	external

JSON

To clipboard

{
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      "text": "critical"
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    "distribution": {
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        "text": "This update for python-httpcore, python-h11 fixes the following issues:\n\npython-h11:\n  - Update 0.16.0:\n    * CVE-2025-43859: Fixed accepting of malformed Chunked-Encoding bodies (bsc#1241872)\n  - 0.15.0:\n    * Reject Content-Lengths \u003e= 1 zettabyte (1 billion terabytes) early,\n      without attempting to parse the integer (#181)\n\npython-httpcore:\n  - CVE-2025-43859: Fixed accepting of malformed Chunked-Encoding bodies (bsc#1241872)\n",
        "title": "Description of the patch"
      },
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    "title": "Security update for python-httpcore, python-h11",
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        "relates_to_product_reference": "SUSE Linux Micro 6.0"
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  "vulnerabilities": [
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          "text": "https://www.suse.com/security/cve/CVE-2025-43859"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11\u0027s parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.",
          "title": "CVE description"
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      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Micro 6.0:python311-h11-0:0.16.0-1.1.noarch",
            "SUSE Linux Micro 6.0:python311-httpcore-0:0.16.3-7.1.noarch"
          ]
        }
      ],
      "scores": [
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            "baseSeverity": "CRITICAL",
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            "version": "3.1"
          },
          "products": [
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          ]
        }
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        }
      ],
      "title": "CVE-2025-43859"
    }
  ]
}

CVE-2025-43859 (GCVE-0-2025-43859)

Vulnerability from cvelistv5 – Published: 2025-04-24 18:15 – Updated: 2025-04-24 19:02

Title

h11 accepts some malformed Chunked-Encoding bodies

Summary

h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-24 19:02 UTC

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/python-hyper/h11/security/advi…	x_refsource_CONFIRM
https://github.com/python-hyper/h11/commit/114803…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
python-hyper	h11	Affected: < 0.16.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-43859",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-24T19:02:05.000674Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-24T19:02:45.130Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "h11",
          "vendor": "python-hyper",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.16.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11\u0027s parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-04-24T18:15:53.328Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/python-hyper/h11/security/advisories/GHSA-vqfr-h8mv-ghfj",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/python-hyper/h11/security/advisories/GHSA-vqfr-h8mv-ghfj"
        },
        {
          "name": "https://github.com/python-hyper/h11/commit/114803a29ce50116dc47951c690ad4892b1a36ed",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/python-hyper/h11/commit/114803a29ce50116dc47951c690ad4892b1a36ed"
        }
      ],
      "source": {
        "advisory": "GHSA-vqfr-h8mv-ghfj",
        "discovery": "UNKNOWN"
      },
      "title": "h11 accepts some malformed Chunked-Encoding bodies"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-43859",
    "datePublished": "2025-04-24T18:15:53.328Z",
    "dateReserved": "2025-04-17T20:07:08.556Z",
    "dateUpdated": "2025-04-24T19:02:45.130Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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Action not permitted

SUSE-SU-2025:20331-1

CVE-2025-43859 (GCVE-0-2025-43859)

Tags

Sightings

Nomenclature

Related by attack behaviour