## Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header Value

- 種別: advisory
- 重大度: medium
- 関連技術: python
- CVE: CVE-2026-115877
- 公開日時: 2026-10-23T20:44:43.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-q7qq-6mhp-9rc4)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-q7qq-6mhp-9rc4

影響: pip:Twisted <= 26.4.0 → 26.10.0rc1
An incomplete header-value validation (CWE-444) in the Twisted HTTP server lets a bare carriage return or line feed in a header value hide a following header from the parser. twisted.web.http.HTTPChannel.headerReceived rejects a NUL byte in a header value but not a bare CR or LF, even though RFC 9110 section 5.5 requires a recipient to reject all three. Because the channel splits requests only on CRLF, a value carrying a bare LF and a second header arrives as one line, so the second header is f…