---
id: CVE-2026-1502
title: CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
summary: CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
severity: none
cwe:
  - CWE-93
published: '2026-04-10'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-1502'
references:
  - url: >-
      https://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/56b7100b04e44ea27989242b176beb8f016b2c53
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/58703ec1bdd1eb075e8b01a0c427683ce594dd3e
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/9e071c9b28c17f347f81b388a003d4eeb3c7a8dd
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2ed
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/c00c386faa579ad71196d33408644478488e43ec
    label: cna@python.org
  - url: 'https://github.com/python/cpython/issues/146211'
    label: cna@python.org
  - url: 'https://github.com/python/cpython/pull/146212'
    label: cna@python.org
  - url: >-
      https://mail.python.org/archives/list/security-announce@python.org/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/
    label: cna@python.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/04/11/4'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00562
epssPercentile: 0.45568
ingestedAt: '2026-07-01T03:50:34.559Z'
---

## Overview

CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.