Skip to content

gh-152248: Fix zoneinfo TZ string regex to only accept ASCII letters #152510

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
factnn wants to merge 1 commit into from
+10 −2
Closed

gh-152248: Fix zoneinfo TZ string regex to only accept ASCII letters #152510

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 5 additions & 0 deletions Lib/test/test_zoneinfo/test_zoneinfo.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1222,6 +1222,11 @@ def test_invalid_tzstr(self):
"AAA4BBB,J60/2:00:100,J300/2",
"AAA4BBB,J60/2,J300/2:00:0",
"AAA4BBB,J60/2,J300/2:00:100",
# gh-152248: unquoted abbreviation must be ASCII letters only
"A A4BBB,J60/2,J300/2", # space in std abbreviation
"AAA4B B,J60/2,J300/2", # space in dst abbreviation
"ÄAA4BBB,J60/2,J300/2", # non-ASCII letter in std
"AAA4ÄBB,J60/2,J300/2", # non-ASCII letter in dst
]

for invalid_tzstr in invalid_tzstrs:
Expand Down
4 changes: 2 additions & 2 deletions Lib/zoneinfo/_zoneinfo.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -640,11 +640,11 @@ def _parse_tz_str(tz_str):

parser_re = re.compile(
r"""
(?P<std>[^<0-9:.+-]+|<[a-zA-Z0-9+-]+>)
(?P<std>[a-zA-Z]+|<[a-zA-Z0-9+-]+>)
(?:
(?P<stdoff>[+-]?\d{1,3}(?::\d{2}(?::\d{2})?)?)
(?:
(?P<dst>[^0-9:.+-]+|<[a-zA-Z0-9+-]+>)
(?P<dst>[a-zA-Z]+|<[a-zA-Z0-9+-]+>)
(?P<dstoff>[+-]?\d{1,3}(?::\d{2}(?::\d{2})?)?)?
)? # dst
)? # stdoff
Expand Down
3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2026-06-29-00-00-01.gh-issue-152248.XxYyZz.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix the pure-Python :func:`zoneinfo._parse_tz_str` to reject unquoted
POSIX TZ string abbreviations containing non-ASCII characters or
whitespace, matching the C implementation's behavior.
Loading