new file mode 100644
@@ -0,0 +1,110 @@
+From 7ffd3a90230cb99bcae4350fcb8498c48044f6a6 Mon Sep 17 00:00:00 2001
+From: "J. Nick Koston" <nick@koston.org>
+Date: Sun, 17 May 2026 19:48:44 -0700
+Subject: [PATCH] fix: bound DNS compression-pointer chain depth in DNSIncoming
+ (#1719)
+
+(cherry picked from commit f9e23592137f30fdf7ef710dba065da31c79b1cf)
+
+CVE: CVE-2026-47180
+Upstream-Status: Backport [https://github.com/python-zeroconf/python-zeroconf/commit/f9e23592137f30fdf7ef710dba065da31c79b1cf]
+Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
+---
+ src/zeroconf/_protocol/incoming.pxd | 2 +-
+ src/zeroconf/_protocol/incoming.py | 14 ++++++++++----
+ tests/test_protocol.py | 22 ++++++++++++++++++++++
+ 3 files changed, 33 insertions(+), 5 deletions(-)
+
+diff --git a/src/zeroconf/_protocol/incoming.pxd b/src/zeroconf/_protocol/incoming.pxd
+index feaa2a0..eface8d 100644
+--- a/src/zeroconf/_protocol/incoming.pxd
++++ b/src/zeroconf/_protocol/incoming.pxd
+@@ -83,7 +83,7 @@ cdef class DNSIncoming:
+ link_py_int=object,
+ linked_labels=cython.list
+ )
+- cdef unsigned int _decode_labels_at_offset(self, unsigned int off, cython.list labels, cython.set seen_pointers)
++ cdef unsigned int _decode_labels_at_offset(self, unsigned int off, cython.list labels, cython.set seen_pointers, unsigned int depth)
+
+ @cython.locals(offset="unsigned int")
+ cdef void _read_header(self)
+diff --git a/src/zeroconf/_protocol/incoming.py b/src/zeroconf/_protocol/incoming.py
+index 2d977b6..d772f47 100644
+--- a/src/zeroconf/_protocol/incoming.py
++++ b/src/zeroconf/_protocol/incoming.py
+@@ -60,7 +60,7 @@ DNS_COMPRESSION_POINTER_LEN = 2
+ MAX_DNS_LABELS = 128
+ MAX_NAME_LENGTH = 253
+
+-DECODE_EXCEPTIONS = (IndexError, struct.error, IncomingDecodeError)
++DECODE_EXCEPTIONS = (IndexError, struct.error, IncomingDecodeError, RecursionError)
+
+
+ _seen_logs: dict[str, int | tuple] = {}
+@@ -409,7 +409,7 @@ class DNSIncoming:
+ labels: list[str] = []
+ seen_pointers: set[int] = set()
+ original_offset = self.offset
+- self.offset = self._decode_labels_at_offset(original_offset, labels, seen_pointers)
++ self.offset = self._decode_labels_at_offset(original_offset, labels, seen_pointers, 0)
+ self._name_cache[original_offset] = labels
+ name = ".".join(labels) + "."
+ if len(name) > MAX_NAME_LENGTH:
+@@ -418,8 +418,14 @@ class DNSIncoming:
+ )
+ return name
+
+- def _decode_labels_at_offset(self, off: _int, labels: list[str], seen_pointers: set[int]) -> int:
++ def _decode_labels_at_offset(
++ self, off: _int, labels: list[str], seen_pointers: set[int], depth: _int
++ ) -> int:
+ # This is a tight loop that is called frequently, small optimizations can make a difference.
++ if depth > MAX_DNS_LABELS:
++ raise IncomingDecodeError(
++ f"DNS compression pointer chain exceeds {MAX_DNS_LABELS} at {off} from {self.source}"
++ )
+ view = self.view
+ while off < self._data_len:
+ length = view[off]
+@@ -457,7 +463,7 @@ class DNSIncoming:
+ if not linked_labels:
+ linked_labels = []
+ seen_pointers.add(link_py_int)
+- self._decode_labels_at_offset(link, linked_labels, seen_pointers)
++ self._decode_labels_at_offset(link, linked_labels, seen_pointers, depth + 1)
+ self._name_cache[link_py_int] = linked_labels
+ labels.extend(linked_labels)
+ if len(labels) > MAX_DNS_LABELS:
+diff --git a/tests/test_protocol.py b/tests/test_protocol.py
+index edd87c2..bac2b44 100644
+--- a/tests/test_protocol.py
++++ b/tests/test_protocol.py
+@@ -1011,6 +1011,28 @@ def test_label_compression_attack():
+ assert len(parsed.answers()) == 1
+
+
++def test_dns_compression_pointer_chain_depth_attack() -> None:
++ """Test our wire parser rejects deeply chained compression pointers without recursing."""
++ # Build a packet with one question whose name is a 1500-deep chain of forward
++ # compression pointers, ending in a root label. Each pointer is 2 bytes,
++ # so chain length easily exceeds CPython's default recursion limit.
++ header = b"\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00"
++ # Question at offset 12: pointer to offset 18 (past the question's type/class).
++ question_name = bytes([0xC0, 18])
++ question_type_class = b"\x00\x01\x00\x01"
++ chain_depth = 1500
++ chain = bytearray()
++ for i in range(chain_depth):
++ target = 18 + 2 * (i + 1)
++ chain.append(0xC0 | (target >> 8))
++ chain.append(target & 0xFF)
++ chain.append(0x00)
++ packet = header + question_name + question_type_class + bytes(chain)
++ parsed = r.DNSIncoming(packet, ("1.2.3.4", 5353))
++ assert parsed.valid is False
++ assert parsed.questions == []
++
++
+ def test_dns_compression_loop_attack():
+ """Test our wire parser does not loop forever when dns compression is in a loop."""
+ packet = (
@@ -5,6 +5,8 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=9fe712b1bc27c5c4e9ecd7f31d208900"
SRC_URI[sha256sum] = "03fcca123df3652e23d945112d683d2f605f313637611b7d4adf31056f681702"
+SRC_URI += "file://CVE-2026-47180.patch"
+
inherit pypi python_poetry_core cython
RDEPENDS:${PN} += " \