diff --git a/meta-python/recipes-devtools/python/python3-aiohttp/CVE-2026-50269.patch b/meta-python/recipes-devtools/python/python3-aiohttp/CVE-2026-50269.patch
new file mode 100644
index 0000000000..1bde87e4e8
--- /dev/null
+++ b/meta-python/recipes-devtools/python/python3-aiohttp/CVE-2026-50269.patch
@@ -0,0 +1,81 @@
+From 7fb9ddce2c1a376ef46f9ec2195e5d75db60c227 Mon Sep 17 00:00:00 2001
+From: "patchback[bot]" <45432694+patchback[bot]@users.noreply.github.com>
+Date: Thu, 28 May 2026 23:57:41 +0100
+Subject: [PATCH] [PR #12719/879d48d1 backport][3.14] Reject invalid bytes in
+ multipart/payload headers (#12720)
+
+**This is a backport of PR #12719 as merged into master
+(879d48d1619b9bc3662037afcb8bfa790a205e9b).**
+
+CVE: CVE-2026-50269
+Upstream-Status: Backport [https://github.com/aio-libs/aiohttp/commit/bf88077ebb14f4c29924b8e8904cba20c55c28b8]
+
+Co-authored-by: Sam Bull <git@sambull.org>
+(cherry picked from commit bf88077ebb14f4c29924b8e8904cba20c55c28b8)
+Signed-off-by: Darsh Kelaiya <dkelaiya@cisco.com>
+---
+ CHANGES/12706.bugfix.rst |  1 +
+ aiohttp/payload.py       |  8 +++++---
+ tests/test_payload.py    | 15 +++++++++++++++
+ 3 files changed, 21 insertions(+), 3 deletions(-)
+ create mode 100644 CHANGES/12706.bugfix.rst
+
+diff --git a/CHANGES/12706.bugfix.rst b/CHANGES/12706.bugfix.rst
+new file mode 100644
+index 000000000..9248585f9
+--- /dev/null
++++ b/CHANGES/12706.bugfix.rst
+@@ -0,0 +1 @@
++Fixed invalid bytes being allowed in multipart/payload headers -- by :user:`Dreamsorcerer`.
+diff --git a/aiohttp/payload.py b/aiohttp/payload.py
+index 5b88fa094..23d127056 100644
+--- a/aiohttp/payload.py
++++ b/aiohttp/payload.py
+@@ -35,6 +35,7 @@ from .helpers import (
+     parse_mimetype,
+     sentinel,
+ )
++from .http_writer import _safe_header
+ from .streams import StreamReader
+ from .typedefs import JSONEncoder, _CIMultiDict
+ 
+@@ -209,9 +210,10 @@ class Payload(ABC):
+     @property
+     def _binary_headers(self) -> bytes:
+         return (
+-            "".join([k + ": " + v + "\r\n" for k, v in self.headers.items()]).encode(
+-                "utf-8"
+-            )
++            "".join(
++                _safe_header(k) + ": " + _safe_header(v) + "\r\n"
++                for k, v in self.headers.items()
++            ).encode("utf-8")
+             + b"\r\n"
+         )
+ 
+diff --git a/tests/test_payload.py b/tests/test_payload.py
+index 9aa97b20d..b60aa7e7c 100644
+--- a/tests/test_payload.py
++++ b/tests/test_payload.py
+@@ -101,6 +101,21 @@ def test_payload_content_type() -> None:
+     assert p.content_type == "application/json"
+ 
+ 
++@pytest.mark.parametrize("bad_byte", ("\r", "\n", "\x00"))
++def test_binary_headers_reject_injection_in_value(bad_byte: str) -> None:
++    p = Payload("test", headers={"X-Custom": f"value{bad_byte}Injected: bad"})
++    with pytest.raises(ValueError, match="header injection"):
++        p._binary_headers
++
++
++@pytest.mark.parametrize("bad_byte", ("\r", "\n", "\x00"))
++def test_binary_headers_reject_injection_in_name(bad_byte: str) -> None:
++    p = Payload("test")
++    p.headers[f"X-Custom{bad_byte}Injected"] = "value"
++    with pytest.raises(ValueError, match="header injection"):
++        p._binary_headers
++
++
+ def test_bytes_payload_default_content_type() -> None:
+     p = payload.BytesPayload(b"data")
+     assert p.content_type == "application/octet-stream"
diff --git a/meta-python/recipes-devtools/python/python3-aiohttp_3.13.5.bb b/meta-python/recipes-devtools/python/python3-aiohttp_3.13.5.bb
index d17043bc3e..33ef64a59b 100644
--- a/meta-python/recipes-devtools/python/python3-aiohttp_3.13.5.bb
+++ b/meta-python/recipes-devtools/python/python3-aiohttp_3.13.5.bb
@@ -9,6 +9,7 @@ SRC_URI[sha256sum] = "9d98cc980ecc96be6eb4c1994ce35d28d8b1f5e5208a23b421187d1209
 SRC_URI += " \
     file://CVE-2026-34993.patch \
     file://CVE-2026-47265.patch \
+    file://CVE-2026-50269.patch \
 "
 
 CVE_PRODUCT = "aiohttp"