python3-pyjwt: Fix CVE-2026-48522

Restrict PyJWKClient JWKS retrieval to HTTP and HTTPS. urllib otherwise accepts schemes such as file, FTP and data, allowing attacker-influenced URLs to reach unintended resources. This patch applies the relevant subset of the upstream 2.13.0 fix. The upstream commit is referenced in [1], and the public advisory is referenced in [2]. [1] https://github.com/jpadilla/pyjwt/commit/95791b1759b8aa4f2203575d344d5c78564cdc81 [2] https://github.com/advisories/GHSA-993g-76c3-p5m4 Signed-off-by: Hetvi Thakar <hthakar@cisco.com> Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
2026-08-25 05:21:31 +00:00 · 2026-08-05 22:50:57 -07:00
parent 49bb7f1369
commit 773e345eca
2 changed files with 98 additions and 1 deletions
@@ -0,0 +1,94 @@
+From ff542029d6865add176b3d4b650d8f1dc514ac85 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 03:20:44 -0700
+Subject: [PATCH] PyJWKClient: reject non-HTTP(S) JWKS URIs
+
+Restrict JWKS retrieval to HTTP and HTTPS. urllib otherwise accepts
+additional schemes such as file, FTP and data, allowing
+attacker-influenced URLs to reach unintended resources.
+
+CVE: CVE-2026-48522
+Upstream-Status: Backport [https://github.com/jpadilla/pyjwt/commit/95791b1759b8aa4f2203575d344d5c78564cdc81]
+
+Backport Changes:
+- Extracted only the CVE-2026-48522 URI-scheme validation and regression
+  tests from the bundled upstream 2.13.0 commit. The other requested CVE
+  fixes are carried as separate patches.
+- Adapted the hunk context to the PyJWT 2.8.0 constructor and typing imports.
+- Omitted upstream test comments while retaining the same URI cases and
+  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        | 11 +++++++++++
+ tests/test_jwks_client.py | 25 +++++++++++++++++++++++++
+ 2 files changed, 36 insertions(+)
+
+diff --git a/jwt/jwks_client.py b/jwt/jwks_client.py
+index f19b10a..18de342 100644
+--- a/jwt/jwks_client.py
+++ b/jwt/jwks_client.py
+@@ -4,6 +4,7 @@ from functools import lru_cache
+ from ssl import SSLContext
+ from typing import Any, Dict, List, Optional
+ from urllib.error import URLError
+from urllib.parse import urlparse
+ 
+ from .api_jwk import PyJWK, PyJWKSet
+ from .api_jwt import decode_complete as decode_token
+@@ -25,6 +26,16 @@ class PyJWKClient:
+     ):
+         if headers is None:
+             headers = {}
+        # urllib's default OpenerDirector also handles file://, ftp://, and
+        # data: URIs. Reject anything that isn't http(s) eagerly so a caller
+        # passing an attacker-influenced URL (e.g. taken from a `jku` token
+        # header) can't read local files or reach other unintended schemes.
+        scheme = urlparse(uri).scheme.lower()
+        if scheme not in ("http", "https"):
+            raise PyJWKClientError(
+                f"Invalid JWKS URI scheme {scheme!r}: only 'http' and 'https' "
+                f"are supported."
+            )
+         self.uri = uri
+         self.jwk_set_cache: Optional[JWKSetCache] = None
+         self.headers = headers
+diff --git a/tests/test_jwks_client.py b/tests/test_jwks_client.py
+index c3951ea..d4bdd35 100644
+--- a/tests/test_jwks_client.py
+++ b/tests/test_jwks_client.py
+@@ -327,6 +327,31 @@ class TestPyJWKClient:
+             jwks_client = PyJWKClient(url, lifespan=-1)
+             assert jwks_client is None
+ 
+    @pytest.mark.parametrize(
+        "uri",
+        [
+            "file:///etc/passwd",
+            "ftp://example.org/keys.json",
+            'data:application/json,{"keys":[]}',
+            "/etc/passwd",
+            "ldap://internal.test/jwks",
+        ],
+    )
+    def test_pyjwkclient_rejects_non_http_schemes(self, uri: str) -> None:
+        with pytest.raises(PyJWKClientError, match="Invalid JWKS URI scheme"):
+            PyJWKClient(uri)
+
+    @pytest.mark.parametrize(
+        "uri",
+        [
+            "http://localhost/jwks.json",
+            "https://example.test/jwks.json",
+            "HTTPS://Example.Test/jwks.json",
+        ],
+    )
+    def test_pyjwkclient_accepts_http_https_schemes(self, uri: str) -> None:
+        PyJWKClient(uri)
+
+     def test_get_jwt_set_timeout(self):
+         url = "https://dev-87evx9ru.auth0.com/.well-known/jwks.json"
+         jwks_client = PyJWKClient(url, timeout=5)
@@ -5,7 +5,10 @@ HOMEPAGE = "http://github.com/jpadilla/pyjwt"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=e4b56d2c9973d8cf54655555be06e551"

-SRC_URI += "file://CVE-2026-32597.patch"
+SRC_URI += " \
+    file://CVE-2026-32597.patch \
+    file://CVE-2026-48522.patch \
+"
 SRC_URI[sha256sum] = "57e28d156e3d5c10088e0c68abb90bfac3df82b40a71bd0daa20c65ccd5c23de"

 PYPI_PACKAGE = "PyJWT"