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gh-152248: Reject a POSIX TZ abbreviation with non-ASCII-letter characters in pure-Python zoneinfo #152249

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Merged
StanFromIreland merged 6 commits into from
Jun 30, 2026
+26 −4
Merged

gh-152248: Reject a POSIX TZ abbreviation with non-ASCII-letter characters in pure-Python zoneinfo #152249

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8c164ba
gh-152248: Reject a POSIX TZ abbreviation with non-ASCII-letter chara…
tonghuaroot Jun 26, 2026
8a6bcd2
Trim test comments
tonghuaroot Jun 26, 2026
6dd23ff
Wrap test comment to 79 columns
tonghuaroot Jun 26, 2026
bf26921
Reuse zone_from_tzstr with an encoding parameter in the non-ASCII test
tonghuaroot Jun 26, 2026
1931021
Reject an empty quoted abbreviation in the C zoneinfo parser
tonghuaroot Jun 26, 2026
1891398
Polish
StanFromIreland Jun 29, 2026
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Reject an empty quoted abbreviation in the C zoneinfo parser
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@tonghuaroot
tonghuaroot committed Jun 26, 2026
commit 1931021bd2f0e91bfbe4d4a4e26f7ee61c894003
3 changes: 3 additions & 0 deletions Lib/test/test_zoneinfo/test_zoneinfo.py
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Expand Up @@ -1149,6 +1149,9 @@ def test_invalid_tzstr(self):
"AB C3",
" A B 3",
"AAA4BB B,J60/2,J300/2", # Embedded whitespace in DST
# Empty quoted abbreviation
"<>5",
"AAA4<>,M3.2.0/2,M11.1.0/3",
"PST8PDT,M3.2.0/2", # Only one transition rule
# Invalid offset hours
"AAA168",
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7 changes: 3 additions & 4 deletions Misc/NEWS.d/next/Library/2026-06-26-13-39-11.gh-issue-152248.N2Rmaf.rst
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@@ -1,4 +1,3 @@
Fix the pure-Python :mod:`zoneinfo` parser accepting an unquoted POSIX TZ
abbreviation that contains characters other than ASCII letters (for example an
embedded space), which the C implementation already rejects. Patch by
tonghuaroot.
Make the C and pure-Python :mod:`zoneinfo` parsers validate POSIX TZ
abbreviations consistently, rejecting unquoted abbreviations with non-letter
characters and empty quoted abbreviations (``<>``). Patch by tonghuaroot.
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3 changes: 3 additions & 0 deletions Modules/_zoneinfo.c
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Expand Up @@ -1762,6 +1762,9 @@ parse_abbr(const char **p, PyObject **abbr)
ptr++;
}
str_end = ptr;
if (str_end == str_start) {
return -1;
}
ptr++;
}
else {
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