FKIE_CVE-2026-0865

Vulnerability from fkie_nvd - Published: 2026-01-20 22:15 - Updated: 2026-01-20 23:16
Severity ?
5.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Summary
User-controlled header names and values containing newlines can allow injecting HTTP headers.
References
cna@python.orghttps://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58
cna@python.orghttps://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510
cna@python.orghttps://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2
cna@python.orghttps://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5
cna@python.orghttps://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995
cna@python.orghttps://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211
cna@python.orghttps://github.com/python/cpython/issues/143916
cna@python.orghttps://github.com/python/cpython/pull/143917
cna@python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "User-controlled header names and values containing newlines can allow injecting HTTP headers."
    }
  ],
  "id": "CVE-2026-0865",
  "lastModified": "2026-01-20T23:16:05.933",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "HIGH",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@python.org",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-20T22:15:52.800",
  "references": [
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/issues/143916"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/pull/143917"
    },
    {
      "source": "cna@python.org",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/"
    }
  ],
  "sourceIdentifier": "cna@python.org",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-74"
        }
      ],
      "source": "cna@python.org",
      "type": "Secondary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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