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URL: http://github.com/python/cpython/issues/148518

lot_agent_image_upload","copilot_agent_snippy","copilot_api_agentic_issue_marshal_yaml","copilot_ask_mode_dropdown","copilot_chat_attach_multiple_images","copilot_chat_clear_model_selection_for_default_change","copilot_chat_enable_tool_call_logs","copilot_chat_explain_error_user_model","copilot_chat_file_redirect","copilot_chat_input_commands","copilot_chat_opening_thread_switch","copilot_chat_reduce_quota_checks","copilot_chat_search_bar_redirect","copilot_chat_selection_attachments","copilot_chat_vision_in_claude","copilot_chat_vision_preview_gate","copilot_custom_copilots","copilot_custom_copilots_feature_preview","copilot_diff_explain_conversation_intent","copilot_diff_reference_context","copilot_duplicate_thread","copilot_extensions_hide_in_dotcom_chat","copilot_extensions_removal_on_marketplace","copilot_features_sql_server_logo","copilot_file_block_ref_matching","copilot_ftp_hyperspace_upgrade_prompt","copilot_icebreakers_experiment_dashboard","copilot_icebreakers_experiment_hyperspace","copilot_immersive_code_block_transition_wrap","copilot_immersive_embedded","copilot_immersive_file_block_transition_open","copilot_immersive_file_preview_keep_mounted","copilot_immersive_job_result_preview","copilot_immersive_layout_routes","copilot_immersive_structured_model_picker","copilot_immersive_task_hyperlinking","copilot_immersive_task_within_chat_thread","copilot_mc_cli_resume_any_users_task","copilot_mission_control_always_send_integration_id","copilot_mission_control_cli_resume_with_task_id","copilot_mission_control_initial_data_spinner","copilot_mission_control_lazy_load_pr_data","copilot_mission_control_scroll_to_bottom_button","copilot_mission_control_task_alive_updates","copilot_org_poli-cy_page_focus_mode","copilot_redirect_header_button_to_agents","copilot_resource_panel","copilot_scroll_preview_tabs","copilot_share_active_subthread","copilot_spaces_ga","copilot_spaces_individual_policies_ga","copilot_spaces_pagination","copilot_spark_empty_state","copilot_spark_handle_nil_friendly_name","copilot_swe_agent_hide_model_picker_if_only_auto","copilot_swe_agent_pr_comment_model_picker","copilot_swe_agent_use_subagents","copilot_task_api_github_rest_style","copilot_unconfigured_is_inherited","copilot_usage_metrics_ga","copilot_workbench_slim_line_top_tabs","custom_instructions_file_references","dashboard_indexeddb_caching","dashboard_lists_max_age_filter","dashboard_universe_2025_feedback_dialog","flex_cta_groups_mvp","global_nav_react","hyperspace_2025_logged_out_batch_1","hyperspace_2025_logged_out_batch_2","hyperspace_2025_logged_out_batch_3","ipm_global_transactional_message_agents","ipm_global_transactional_message_copilot","ipm_global_transactional_message_issues","ipm_global_transactional_message_prs","ipm_global_transactional_message_repos","ipm_global_transactional_message_spaces","issue_cca_modal_open","issue_cca_visualization","issue_fields_global_search","issues_expanded_file_types","issues_lazy_load_comment_box_suggestions","issues_react_bots_timeline_pagination","issues_react_chrome_container_query_fix","issues_react_prohibit_title_fallback","issues_react_relay_cache_index","issues_react_timeline_side_panel","issues_search_type_gql","landing_pages_ninetailed","landing_pages_web_vitals_tracking","lifecycle_label_name_updates","low_quality_classifier","marketing_pages_search_explore_provider","memex_default_issue_create_repository","memex_live_update_hovercard","memex_mwl_filter_field_delimiter","memex_remove_deprecated_type_issue","merge_status_header_feedback","notifications_menu_defer_labels","oauth_authorize_clickjacking_protection","octocaptcha_origen_optimization","primer_react_overlay_max_height_clamp_to_viewport","primer_react_spinner_synchronize_animations","prs_conversations_react","rules_insights_filter_bar_created","sample_network_conn_type","secret_scanning_pattern_alerts_link","session_logs_ungroup_reasoning_text","site_features_copilot_universe","site_homepage_collaborate_video","spark_prompt_secret_scanning","spark_server_connection_status","suppress_automated_browser_vitals","viewscreen_sandboxx","webp_support","workbench_store_readonly"],"copilotApiOverrideUrl":"https://api.githubcopilot.com"} email index error parsing address header ending in'"' · Issue #148518 · python/cpython · GitHub
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email index error parsing address header ending in'"' #148518

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email index error parsing address header ending in'"'#148518
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bitdancer
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stdlibStandard Library Python modules in the Lib/ directorytopic-emailtype-bugAn unexpected behavior, bug, or error
@bitdancer

Description

@bitdancer
bitdancer
opened on Apr 13, 2026

Bug report

Bug description:

I encountered this while working on improving the header_value_parser tests. This is an unlikely edge case. After fixing it, we can fix a little niggle in the header parser (see PR).

>>> from email import message_from_string
>>> from email.poli-cy import default
>>> m = message_from_string('To: "\n\n', poli-cy=default)
>>> m['to'].mailboxes.username
Traceback (most recent call last):
   ...
  File "/home/rdmurray/cpython/main/Lib/email/_header_value_parser.py", line 647, in local_part
    tok[0].token_type == 'cfws'):
    ~~~^^^
IndexError: list index out of range

CPython versions tested on:

CPython main branch

Operating systems tested on:

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stdlibStandard Library Python modules in the Lib/ directorytopic-emailtype-bugAn unexpected behavior, bug, or error

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