# AN-2026-0753: Python 3.12 removed ssl.wrap_socket(), ssl.match_hostname(), configparser.SafeConfigParser / readfp() and locale.format(): "module 'ssl' has no attribute 'wrap_socket'"

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- id: AN-2026-0753 (version 1; cite https://breakwire.org/claim/AN-2026-0753/v/1)
- kind: breaking · status: active · review: editor
- source: <https://docs.python.org/3/whatsnew/3.12.html#:~:text=Remove%20the%20ssl.wrap_socket()%20function>
- more sources: <https://github.com/python/cpython/blob/v3.15.2/Objects/moduleobject.c> <https://github.com/python/cpython/blob/v3.15.2/Objects/object.c>
- event date: 2023-10-02
- services: python
- affected: engines.python >=3.12
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. What's New in Python 3.12 (opened 2026-11-04) says ssl.wrap_socket() (deprecated in 3.7) was removed: create an ssl.SSLContext and call its wrap_socket method; any package still using ssl.wrap_socket() is broken and insecure because it neither sends SNI nor validates the server hostname. ssl.match_hostname() and ssl.RAND_pseudo_bytes() were removed too.  [✓0 ✗0]
1. The same page says configparser no longer has a SafeConfigParser class (use ConfigParser) and ConfigParser no longer has a readfp method (use read_file()), and locale.format() was removed (use locale.format_string()).  [✓0 ✗0]
2. Reproduced 2026-11-04 on CPython 3.12.16: module 'ssl' has no attribute 'wrap_socket' / 'match_hostname', module 'configparser' has no attribute 'SafeConfigParser', 'ConfigParser' object has no attribute 'readfp', module 'locale' has no attribute 'format'.  [✓0 ✗0]

## Fix
```text
ssl.wrap_socket(sock, ...) -> ctx = ssl.create_default_context(); ctx.wrap_socket(sock, server_hostname=host) (hostname checking is done by OpenSSL, so drop match_hostname calls). SafeConfigParser -> ConfigParser; parser.readfp(f) -> parser.read_file(f); locale.format(...) -> locale.format_string(...). If a dependency raises it, upgrade that package.
```

## Error signatures
- code: `module 'ssl' has no attribute 'wrap_socket'` (CPython message, reproduced 2026-11-04 on CPython 3.12.16)
- code: `module 'ssl' has no attribute 'match_hostname'` (CPython message, reproduced 2026-11-04 on CPython 3.12.16)
- code: `module 'configparser' has no attribute 'SafeConfigParser'` (CPython message, reproduced 2026-11-04 on CPython 3.12.16)
- code: `object has no attribute 'readfp'` (CPython message, reproduced 2026-11-04 on CPython 3.12.16)
- code: `module 'locale' has no attribute 'format'` (CPython message, reproduced 2026-11-04 on CPython 3.12.16)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0753/reports_

## History
- v1 2026-11-04 by wire-editor: filed from primary source opened 2026-10-28