diff --git a/openssh-9.9p1-reject-cntrl-chars-in-username.patch b/openssh-9.9p1-reject-cntrl-chars-in-username.patch
new file mode 100644
index 0000000..05bbe4d
--- /dev/null
+++ b/openssh-9.9p1-reject-cntrl-chars-in-username.patch
@@ -0,0 +1,59 @@
+diff --color -ruNp a/ssh.c b/ssh.c
+--- a/ssh.c	2025-12-03 15:22:36.754555231 +0100
++++ b/ssh.c	2025-12-03 16:12:16.715320349 +0100
+@@ -662,6 +662,8 @@ valid_ruser(const char *s)
+ 	if (*s == '-')
+ 		return 0;
+ 	for (i = 0; s[i] != 0; i++) {
++		if (iscntrl((u_char)s[i]))
++			return 0;
+ 		if (strchr("'`\";&<>|(){}", s[i]) != NULL)
+ 			return 0;
+ 		/* Disallow '-' after whitespace */
+@@ -683,6 +685,7 @@ main(int ac, char **av)
+ 	struct ssh *ssh = NULL;
+ 	int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
+ 	int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
++	int user_on_commandline = 0;
+ 	char *p, *cp, *line, *argv0, *logfile;
+ 	char cname[NI_MAXHOST], thishost[NI_MAXHOST];
+ 	struct stat st;
+@@ -1039,8 +1042,10 @@ main(int ac, char **av)
+ 			}
+ 			break;
+ 		case 'l':
+-			if (options.user == NULL)
++			if (options.user == NULL) {
+ 				options.user = optarg;
++				user_on_commandline = 1;
++			}
+ 			break;
+ 
+ 		case 'L':
+@@ -1143,6 +1148,7 @@ main(int ac, char **av)
+ 			if (options.user == NULL) {
+ 				options.user = tuser;
+ 				tuser = NULL;
++				user_on_commandline = 1;
+ 			}
+ 			free(tuser);
+ 			if (options.port == -1 && tport != -1)
+@@ -1157,6 +1163,7 @@ main(int ac, char **av)
+ 				if (options.user == NULL) {
+ 					options.user = p;
+ 					p = NULL;
++					user_on_commandline = 1;
+ 				}
+ 				*cp++ = '\0';
+ 				host = xstrdup(cp);
+@@ -1459,6 +1466,10 @@ main(int ac, char **av)
+ 	cinfo->locuser = xstrdup(pw->pw_name);
+ 	cinfo->jmphost = xstrdup(options.jump_host == NULL ?
+ 	    "" : options.jump_host);
++
++	if (user_on_commandline && !valid_ruser(options.user))
++		fatal("remote username contains invalid characters");
++
+ 	cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost,
+ 	    cinfo->remhost, cinfo->portstr, cinfo->remuser, cinfo->jmphost);
+ 
diff --git a/openssh.spec b/openssh.spec
index b0bd1de..7832be2 100644
--- a/openssh.spec
+++ b/openssh.spec
@@ -240,6 +240,8 @@ Patch1034: openssh-9.9p1-fips-gss.patch
 #upstream 4f14ca8633a2c8c0a1a19165663421f0ab32f6ab
 Patch1035: openssh-9.9p1-scp-traversing.patch
 Patch1036: openssh-9.9p1-canonical-match-user.patch
+# upstream 35d5917652106aede47621bb3f64044604164043
+Patch1037: openssh-9.9p1-reject-cntrl-chars-in-username.patch
 
 License: BSD
 Requires: /sbin/nologin
@@ -452,6 +454,7 @@ popd
 %patch1034 -p1 -b .gss-fips
 %patch1035 -p1 -b .scp-traversing
 %patch1036 -p1 -b .canonical-match-user
+%patch1037 -p1 -b .reject-cntrl-chars-in-username
 
 autoreconf
 pushd pam_ssh_agent_auth-pam_ssh_agent_auth-%{pam_ssh_agent_ver}
@@ -743,6 +746,8 @@ test -f %{sysconfig_anaconda} && \
 * Tue Dec 09 2025 Zoltan Fridrich <zfridric@redhat.com> - 9.9p1-3
 - Enable support for DSA keys
   Resolves: RHEL-127624
+- CVE-2025-61984: Reject usernames with control characters
+  Resolves: RHEL-133959
 
 * Mon Oct 27 2025 Zoltan Fridrich <zfridric@redhat.com> - 9.9p1-2
 - Fix implicit destination path selection when source path ends with ".."