Fixed CVE-2025-14550 -- Optimized repeated header parsing in ASGI requests.

Thanks Jiyong Yang for the report, and Natalia Bidart, Jacob Walls, and
Shai Berger for reviews.

3 files changed, 36 insertions, 0 deletions

diff --git a/docs/releases/4.2.28.txt b/docs/releases/4.2.28.txt
index 9f6d5cb152..67d398308c 100644
--- a/docs/releases/4.2.28.txt
+++ b/docs/releases/4.2.28.txt
@@ -17,3 +17,15 @@ allowed remote attackers to enumerate users via a timing attack.
 
 This issue has severity "low" according to the :ref:`Django security policy
 <security-disclosure>`.
+
+CVE-2025-14550: Potential denial-of-service vulnerability via repeated headers when using ASGI
+==============================================================================================
+
+When receiving duplicates of a single header, ``ASGIRequest`` allowed a remote
+attacker to cause a potential denial-of-service via a specifically created
+request with multiple duplicate headers. The vulnerability resulted from
+repeated string concatenation while combining repeated headers, which
+produced super-linear computation resulting in service degradation or outage.
+
+This issue has severity "moderate" according to the :ref:`Django security
+policy <security-disclosure>`.
diff --git a/docs/releases/5.2.11.txt b/docs/releases/5.2.11.txt
index f975e45166..1e5187d7ec 100644
--- a/docs/releases/5.2.11.txt
+++ b/docs/releases/5.2.11.txt
@@ -17,3 +17,15 @@ allowed remote attackers to enumerate users via a timing attack.
 
 This issue has severity "low" according to the :ref:`Django security policy
 <security-disclosure>`.
+
+CVE-2025-14550: Potential denial-of-service vulnerability via repeated headers when using ASGI
+==============================================================================================
+
+When receiving duplicates of a single header, ``ASGIRequest`` allowed a remote
+attacker to cause a potential denial-of-service via a specifically created
+request with multiple duplicate headers. The vulnerability resulted from
+repeated string concatenation while combining repeated headers, which
+produced super-linear computation resulting in service degradation or outage.
+
+This issue has severity "moderate" according to the :ref:`Django security
+policy <security-disclosure>`.
diff --git a/docs/releases/6.0.2.txt b/docs/releases/6.0.2.txt
index ba39f74082..a258259195 100644
--- a/docs/releases/6.0.2.txt
+++ b/docs/releases/6.0.2.txt
@@ -18,6 +18,18 @@ allowed remote attackers to enumerate users via a timing attack.
 This issue has severity "low" according to the :ref:`Django security policy
 <security-disclosure>`.
 
+CVE-2025-14550: Potential denial-of-service vulnerability via repeated headers when using ASGI
+==============================================================================================
+
+When receiving duplicates of a single header, ``ASGIRequest`` allowed a remote
+attacker to cause a potential denial-of-service via a specifically created
+request with multiple duplicate headers. The vulnerability resulted from
+repeated string concatenation while combining repeated headers, which
+produced super-linear computation resulting in service degradation or outage.
+
+This issue has severity "moderate" according to the :ref:`Django security
+policy <security-disclosure>`.
+
 Bugfixes
 ========