python3-idna: Fix CVE-2026-45409

This patch applies the complete upstream fix chain for
CVE-2026-45409. Commit [1] introduces early domain-length rejection
required by [2]. Commit [2] is the v3.14 fix identified by [5], and
commit [3] extends the protection to per-label conversions and codec
support to complete the v3.15 fix described in [4].

[1] https://github.com/kjd/idna/commit/c0dda4501df5
[2] https://github.com/kjd/idna/commit/628fef84d3ed
[3] https://github.com/kjd/idna/commit/e1cb465b6376
[4] https://github.com/kjd/idna/security/advisories/GHSA-65pc-fj4g-8rjx
[5] https://security-tracker.debian.org/tracker/CVE-2026-45409

(From OE-Core rev: 09773d9d1b44dfe868913b6bb142a728529f62cb)

Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3-idna/CVE-2026-45409_p3.patch

@@ -0,0 +1,72 @@
+From 22acbaae97c3698005e69555eb4ebccc168b2fff Mon Sep 17 00:00:00 2001
+From: metsw24-max <metsw24@gmail.com>
+Date: Mon, 11 May 2026 20:59:30 +0530
+Subject: [PATCH 3/3] Enforce early length limits in check_label
+
+CVE: CVE-2026-45409
+Upstream-Status: Backport [https://github.com/kjd/idna/commit/e1cb465b6376f33306a26f467d197edbcd01c4b9]
+
+(cherry picked from commit e1cb465b6376f33306a26f467d197edbcd01c4b9)
+Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
+---
+ idna/core.py       | 11 +++++++++++
+ tests/test_idna.py | 24 ++++++++++++++++++++++++
+ 2 files changed, 35 insertions(+)
+
+diff --git a/idna/core.py b/idna/core.py
+index 4a9fc75..26bb9fa 100644
+--- a/idna/core.py
++++ b/idna/core.py
+@@ -230,6 +230,17 @@ def check_label(label: Union[str, bytes, bytearray]) -> None:
+         label = label.decode('utf-8')
+     if len(label) == 0:
+         raise IDNAError('Empty Label')
++    # Reject oversized labels before per-codepoint validation runs.
++    # CONTEXTJ/CONTEXTO checks scan the whole label per codepoint, so an
++    # uncapped label drives validation into quadratic time
++    # (GHSA-65pc-fj4g-8rjx / CVE-2024-3651). encode()/decode() cap the
++    # whole-domain length; this cap protects direct callers of
++    # alabel/ulabel/check_label and the idna2008 incremental codec.
++    # Use the whole-domain bound rather than the per-label DNS bound so
++    # that UTS #46 lenient decoding of labels longer than 63 chars is
++    # preserved.
++    if not valid_string_length(label, trailing_dot=True):
++        raise IDNAError("Label too long")
+ 
+     check_nfc(label)
+     check_hyphen_ok(label)
+diff --git a/tests/test_idna.py b/tests/test_idna.py
+index 5001b48..2dc0892 100755
+--- a/tests/test_idna.py
++++ b/tests/test_idna.py
+@@ -91,6 +91,30 @@ class IDNATests(unittest.TestCase):
+             self.assertRaises(idna.IDNAError, idna.decode, payload)
+             self.assertLess(time.perf_counter() - start, 1.0)
+ 
++    def test_oversized_label_rejected_promptly(self):
++        # The whole-domain cap in encode()/decode() does not cover direct
++        # callers of alabel/ulabel/check_label, nor the idna2008
++        # incremental codec which calls alabel/ulabel per label. Without a
++        # per-label cap, a single oversized CONTEXTO-heavy label still
++        # drives validation into quadratic time.
++        import codecs
++        import time
++
++        import idna.codec  # noqa: F401  (register the idna2008 codec)
++
++        payload = "・" * 8000 + "漢"
++        start = time.perf_counter()
++        self.assertRaises(idna.IDNAError, idna.check_label, payload)
++        self.assertRaises(idna.IDNAError, idna.alabel, payload)
++        self.assertRaises(idna.IDNAError, idna.ulabel, payload)
++        self.assertRaises(
++            idna.IDNAError,
++            codecs.getincrementalencoder("idna2008")().encode,
++            payload,
++            True,
++        )
++        self.assertLess(time.perf_counter() - start, 1.0)
++
+     def test_check_bidi(self):
+ 
+         l = '\u0061'