new file mode 100644
@@ -0,0 +1,91 @@
+From cb19f697eff2807d28c66639e5ee39cc92de4985 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Jos=C3=A9=20Padilla?= <jpadilla@users.noreply.github.com>
+Date: Mon, 3 Aug 2026 03:21:01 -0700
+Subject: [PATCH] PyJWKClient: preserve cached JWKS on fetch errors
+
+Only replace the cached JWK set after a successful fetch. A failed
+refresh previously stored None from the finally block and discarded
+valid cached keys.
+
+CVE: CVE-2026-48524
+Upstream-Status: Backport [https://github.com/jpadilla/pyjwt/commit/95791b1759b8aa4f2203575d344d5c78564cdc81]
+
+Backport Changes:
+- Extracted only the CVE-2026-48524 successful-fetch cache update and
+ regression test from the bundled upstream 2.13.0 commit. The other
+ requested CVE fixes are carried as separate patches.
+- Adapted the hunk and test locations to PyJWT 2.8.0 and shortened the
+ upstream explanatory comments without changing behavior or assertions.
+- Omitted the 2.13.0 version and changelog updates, CVE-2026-48523 (which
+ does not affect 2.8.0), and unrelated hardening from the bundled commit.
+
+(cherry picked from commit 95791b1759b8aa4f2203575d344d5c78564cdc81)
+Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
+---
+ jwt/jwks_client.py | 12 ++++++------
+ tests/test_jwks_client.py | 12 ++++++++++--
+ 2 files changed, 16 insertions(+), 8 deletions(-)
+
+diff --git a/jwt/jwks_client.py b/jwt/jwks_client.py
+index 18de342..0e7d226 100644
+--- a/jwt/jwks_client.py
++++ b/jwt/jwks_client.py
+@@ -59,7 +59,6 @@ class PyJWKClient:
+ self.get_signing_key = lru_cache(maxsize=max_cached_keys)(self.get_signing_key) # type: ignore
+
+ def fetch_data(self) -> Any:
+- jwk_set: Any = None
+ try:
+ r = urllib.request.Request(url=self.uri, headers=self.headers)
+ with urllib.request.urlopen(
+@@ -70,11 +69,12 @@ class PyJWKClient:
+ raise PyJWKClientConnectionError(
+ f'Fail to fetch data from the url, err: "{e}"'
+ )
+- else:
+- return jwk_set
+- finally:
+- if self.jwk_set_cache is not None:
+- self.jwk_set_cache.put(jwk_set)
++
++ # Only update the cache on a successful fetch. Writing None from a
++ # finally block on error would discard a previously cached JWKS.
++ if self.jwk_set_cache is not None:
++ self.jwk_set_cache.put(jwk_set)
++ return jwk_set
+
+ def get_jwk_set(self, refresh: bool = False) -> PyJWKSet:
+ data = None
+diff --git a/tests/test_jwks_client.py b/tests/test_jwks_client.py
+index d4bdd35..4a836f2 100644
+--- a/tests/test_jwks_client.py
++++ b/tests/test_jwks_client.py
+@@ -271,18 +271,26 @@ class TestPyJWKClient:
+
+ assert repeated_call.call_count == 1
+
+- def test_get_jwt_set_failed_request_should_clear_cache(self):
++ def test_get_jwt_set_failed_refresh_preserves_cached_jwks(self) -> None:
+ url = "https://dev-87evx9ru.auth0.com/.well-known/jwks.json"
+
+ jwks_client = PyJWKClient(url)
+ with mocked_success_response(RESPONSE_DATA_WITH_MATCHING_KID):
+ jwks_client.get_jwk_set()
+
++ assert jwks_client.jwk_set_cache is not None
++ assert jwks_client.jwk_set_cache.get() is not None
++
+ with pytest.raises(PyJWKClientError):
+ with mocked_failed_response():
+ jwks_client.get_jwk_set(refresh=True)
+
+- assert jwks_client.jwk_set_cache is None
++ cached = jwks_client.jwk_set_cache.get()
++ assert cached is not None
++
++ with mocked_success_response(RESPONSE_DATA_WITH_MATCHING_KID) as call:
++ jwks_client.get_jwk_set()
++ assert call.call_count == 0
+
+ def test_failed_request_should_raise_connection_error(self):
+ token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ik5FRTFRVVJCT1RNNE16STVSa0ZETlRZeE9UVTFNRGcyT0Rnd1EwVXpNVGsxUWpZeVJrUkZRdyJ9.eyJpc3MiOiJodHRwczovL2Rldi04N2V2eDlydS5hdXRoMC5jb20vIiwic3ViIjoiYVc0Q2NhNzl4UmVMV1V6MGFFMkg2a0QwTzNjWEJWdENAY2xpZW50cyIsImF1ZCI6Imh0dHBzOi8vZXhwZW5zZXMtYXBpIiwiaWF0IjoxNTcyMDA2OTU0LCJleHAiOjE1NzIwMDY5NjQsImF6cCI6ImFXNENjYTc5eFJlTFdVejBhRTJINmtEME8zY1hCVnRDIiwiZ3R5IjoiY2xpZW50LWNyZWRlbnRpYWxzIn0.PUxE7xn52aTCohGiWoSdMBZGiYAHwE5FYie0Y1qUT68IHSTXwXVd6hn02HTah6epvHHVKA2FqcFZ4GGv5VTHEvYpeggiiZMgbxFrmTEY0csL6VNkX1eaJGcuehwQCRBKRLL3zKmA5IKGy5GeUnIbpPHLHDxr-GXvgFzsdsyWlVQvPX2xjeaQ217r2PtxDeqjlf66UYl6oY6AqNS8DH3iryCvIfCcybRZkc_hdy-6ZMoKT6Piijvk_aXdm7-QQqKJFHLuEqrVSOuBqqiNfVrG27QzAPuPOxvfXTVLXL2jek5meH6n-VWgrBdoMFH93QEszEDowDAEhQPHVs0xj7SIzA"
@@ -8,6 +8,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=e4b56d2c9973d8cf54655555be06e551"
SRC_URI += " \
file://CVE-2026-32597.patch \
file://CVE-2026-48522.patch \
+ file://CVE-2026-48524.patch \
"
SRC_URI[sha256sum] = "57e28d156e3d5c10088e0c68abb90bfac3df82b40a71bd0daa20c65ccd5c23de"