CVE-2026-0865

Summary

User-controlled header names and values containing newlines can allow injecting HTTP headers.

Affected Software

Weaknesses

• CWE-74: CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/python/cpython/pull/143917
• https://github.com/python/cpython/issues/143916
• https://mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/
• https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58
• https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510
• https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5
• https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211
• https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2
• https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995
• https://github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6
• https://github.com/python/cpython/commit/83ecd18779f286d872f68bfce175651e407d9fff
• https://github.com/python/cpython/commit/bfba660085767f8c2d582134e9d511a85eda04cf
• https://github.com/python/cpython/commit/286e3ac39984fe85a17f4ab39c64d382137aae5f
• https://github.com/python/cpython/commit/8bb044d29310bb05d15086cdaa8bf64867d61a97
• https://github.com/python/cpython/commit/c592227ffb48679af9845a45dbb0875d975bb219

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