diff --git a/CHANGES.md b/CHANGES.md
index 98ac35500f..fd7f37fb03 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -488,7 +488,19 @@ OpenSSL 3.1
 
 ### Changes between 3.1.4 and 3.1.5 [xx XXX xxxx]
 
- * none yet
+ * Fix excessive time spent in DH check / generation with large Q parameter
+   value.
+
+   Applications that use the functions DH_generate_key() to generate an
+   X9.42 DH key may experience long delays. Likewise, applications that use
+   DH_check_pub_key(), DH_check_pub_key_ex() or EVP_PKEY_public_check()
+   to check an X9.42 DH key or X9.42 DH parameters may experience long delays.
+   Where the key or parameters that are being checked have been obtained from
+   an untrusted source this may lead to a Denial of Service.
+
+   ([CVE-2023-5678])
+
+   *Richard Levitte*
 
 ### Changes between 3.1.3 and 3.1.4 [24 Oct 2023]
 
@@ -20316,6 +20328,7 @@ ndif
 
 <!-- Links -->
 
+[CVE-2023-5678]: https://www.openssl.org/news/vulnerabilities.html#CVE-2023-5678
 [CVE-2023-5363]: https://www.openssl.org/news/vulnerabilities.html#CVE-2023-5363
 [CVE-2023-4807]: https://www.openssl.org/news/vulnerabilities.html#CVE-2023-4807
 [CVE-2023-3817]: https://www.openssl.org/news/vulnerabilities.html#CVE-2023-3817
diff --git a/NEWS.md b/NEWS.md
index 5808f805a0..a654335049 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -62,7 +62,8 @@ OpenSSL 3.1
 
 ### Major changes between OpenSSL 3.1.4 and OpenSSL 3.1.5 [under development]
 
-  * none
+  * Fix excessive time spent in DH check / generation with large Q parameter
+    value ([CVE-2023-5678])
 
 ### Major changes between OpenSSL 3.1.3 and OpenSSL 3.1.4 [24 Oct 2023]
 
@@ -1519,6 +1520,7 @@ OpenSSL 0.9.x
 
 <!-- Links -->
 
+[CVE-2023-5678]: https://www.openssl.org/news/vulnerabilities.html#CVE-2023-5678
 [CVE-2023-5363]: https://www.openssl.org/news/vulnerabilities.html#CVE-2023-5363
 [CVE-2023-4807]: https://www.openssl.org/news/vulnerabilities.html#CVE-2023-4807
 [CVE-2023-3817]: https://www.openssl.org/news/vulnerabilities.html#CVE-2023-3817