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CVE-2026-0865

User-controlled header names and values containing newlines can allow injecting HTTP headers.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:169b8662a2c2c6a54bea096bf847198111cf83dd6da5bfb93a2dd36f042de4ca
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"CPython","vendor":"Python Software Foundation","versions":[{"lessThan":"3.10.20","status":"affected","version":"0","versionType":"python"},{"lessThan":"3.11.15","status":"affected","version":"3.11.0","versionType":"python"},{"lessThan":"3.12.13","status":"affected","version":"3.12.0","versionType":"python"},{"lessThan":"3.13.12","status":"affected","version":"3.13.0","versionType":"python"},{"lessThan":"3.14.3","status":"affected","version":"3.14.0","versionType":"python"},{"lessThan":"3.15.0a6","status":"affected","version":"3.15.0a1","versionType":"py…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":5.9,"baseSeverity":"MEDIUM","exploitMaturity":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpa…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-74","description":"CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/problemTypes/0/descriptions/0

Source references

15 source assertions
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/3
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/4
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/286e3ac39984fe85a17f4ab39c64d382137aae5f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/12
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/7
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/5
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/9
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/83ecd18779f286d872f68bfce175651e407d9fff"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/10
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/8bb044d29310bb05d15086cdaa8bf64867d61a97"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/13
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/bfba660085767f8c2d582134e9d511a85eda04cf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/11
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/c592227ffb48679af9845a45dbb0875d975bb219"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/14
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/8
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/6
{"tags":["issue-tracking"],"url":"https://github.com/python/cpython/issues/143916"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/python/cpython/pull/143917"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/0
{"tags":["vendor-advisory"],"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50b4bbc56b12bc095723cf3bed25589687872955f2fcf40b53dece243f203890 · sha256:4d6ee4ef206c227c… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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