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* [rpms/bind] f43: Potential wildcard CNAME RPZ policy bypass (CVE-2026-11331)
@ 2026-08-26 9:29
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From: @ 2026-08-26 9:29 UTC (permalink / raw)
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Repo : rpms/bind
Branch : f43
Commit : 45353df914ea344229b98a26a80ba8186c5e693b
Author : Petr Menšík <pemensik@redhat.com>
Date : 2026-08-26T11:07:49+02:00
Stats : +108/-1 in 3 file(s)
URL : https://src.fedoraproject.org/rpms/bind/c/45353df914ea344229b98a26a80ba8186c5e693b?branch=f43
Log:
Potential wildcard CNAME RPZ policy bypass (CVE-2026-11331)
[9.18] [CVE-2026-11331] sec: usr: Fix handling of rpz CNAME expansion that returns name too long
Previously, if the expansion of a wildcard CNAME RPZ policy resulted in a name that exceeded the length limit, a self referential CNAME and the original address record were returned, allowing the policy to be bypassed. In branches up to 9.20, this also left query processing in an inconsistent state which could trigger an assertion failure. We now return a YXDOMAIN response, without the address.
ISC would like to thank Laith Mash'al (0xmshal) for bringing this issue to our attention.
Closes https://gitlab.isc.org/isc-projects/bind9/-/issues/5856
---
diff --git a/bind-9.18-CVE-2026-11331-test.patch b/bind-9.18-CVE-2026-11331-test.patch
new file mode 100644
index 0000000..27aa6cc
--- /dev/null
+++ b/bind-9.18-CVE-2026-11331-test.patch
@@ -0,0 +1,69 @@
+From cde8bb21e09205a7bd1f41fd07ed011fc80d8d71 Mon Sep 17 00:00:00 2001
+From: Mark Andrews <marka@isc.org>
+Date: Fri, 10 Apr 2026 10:24:06 +1000
+Subject: [PATCH] Fix TTL extraction from A/AAAA record
+
+(cherry picked from commit 89c86e338db2492b92e6618c586f146c6928dc6d)
+(cherry picked from commit adc8285d23e2eac6ec463f5dbc5a9596fdd36c60)
+
+Check rpz name too long wildcard CNAME expansion handling
+
+(cherry picked from commit 9345394e2097031b55b3ef34ceaadf5a7ebbeef2)
+(cherry picked from commit 095b11f20f911f5b8059bdc349b256d6c64ece30)
+---
+ bin/tests/system/rpz/ns2/tld2.db | 2 ++
+ bin/tests/system/rpz/ns4/tld4.db | 2 ++
+ bin/tests/system/rpz/tests.sh | 7 +++++--
+ 3 files changed, 9 insertions(+), 2 deletions(-)
+
+diff --git a/bin/tests/system/rpz/ns2/tld2.db b/bin/tests/system/rpz/ns2/tld2.db
+index c6f2556db5..c091ee27b7 100644
+--- a/bin/tests/system/rpz/ns2/tld2.db
++++ b/bin/tests/system/rpz/ns2/tld2.db
+@@ -123,3 +123,5 @@ a7-1 A 192.168.7.1
+
+ a7-2 A 192.168.7.2
+ TXT "a7-2 tld2 text"
++
++*.wild A 192.168.9.1
+diff --git a/bin/tests/system/rpz/ns4/tld4.db b/bin/tests/system/rpz/ns4/tld4.db
+index fca419c6dd..8accd76baf 100644
+--- a/bin/tests/system/rpz/ns4/tld4.db
++++ b/bin/tests/system/rpz/ns4/tld4.db
+@@ -59,6 +59,8 @@ a3-6.tld2 A 56.56.56.56
+
+ a3-7.sub1.tld2 A 57.57.57.57
+
++*.wild.sub1.tld2 A 57.57.57.57
++
+ a3-8.tld2 A 58.58.58.58
+
+ a3-9.sub9.tld2 A 59.59.59.59
+diff --git a/bin/tests/system/rpz/tests.sh b/bin/tests/system/rpz/tests.sh
+index 87e4118ca3..5297437694 100644
+--- a/bin/tests/system/rpz/tests.sh
++++ b/bin/tests/system/rpz/tests.sh
+@@ -391,7 +391,7 @@ addr() {
+ digcmd $2 >$DIGNM
+ #ckalive "$2" "server crashed by 'dig $2'" || return 1
+ ADDR_ESC=$(echo "$ADDR" | sed -e 's/\./\\./g')
+- ADDR_TTL=$(sed -n -e "s/^[-.a-z0-9]\{1,\}[ ]*\([0-9]*\) IN AA* ${ADDR_ESC}\$/\1/p" $DIGNM)
++ ADDR_TTL=$(sed -n -e "s/^[-.a-z0-9]\{1,\}[ ]*\([0-9]*\)[ ]IN[ ]AA*[ ]${ADDR_ESC}\$/\1/p" $DIGNM)
+ if test -z "$ADDR_TTL"; then
+ setret "'dig $2' wrong; no address $ADDR record in $DIGNM"
+ return 0
+@@ -516,7 +516,10 @@ nochange TCP a3-9.tld2 # 33 tcp-only
+ here x.servfail <<'EOF' # 34 qname-wait-recurse yes
+ ;; status: SERVFAIL, x
+ EOF
+-addr 35.35.35.35 "x.servfail @$ns5" # 35 qname-wait-recurse no
++addr 35.35.35.35 "x.servfail @$ns5" # 35 qname-wait-recurse no
++here aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.wild.sub1.tld2 <<'EOF' # 36 wildcard CNAME name to long
++ ;; status: YXDOMAIN, x
++EOF
+ end_group
+ ckstats $ns3 test1 ns3 22
+ ckstats $ns5 test1 ns5 1
+--
+2.55.0
+
diff --git a/bind-9.18-CVE-2026-11331.patch b/bind-9.18-CVE-2026-11331.patch
new file mode 100644
index 0000000..8baa98c
--- /dev/null
+++ b/bind-9.18-CVE-2026-11331.patch
@@ -0,0 +1,31 @@
+From 49f4cc4e93f14f1d5b6a472124e6aa457167fede Mon Sep 17 00:00:00 2001
+From: Mark Andrews <marka@isc.org>
+Date: Fri, 10 Apr 2026 10:26:14 +1000
+Subject: [PATCH] Properly handle rpz name to long wildcard expansion
+
+Previously a self referential CNAME and the original address
+record were returned. We now return a YXDOMAIN response.
+
+(cherry picked from commit cfc4c4f69870ce492deaaa429453563d1621ded3)
+(cherry picked from commit dc328a199f96222e0c30cc20b7b795bfc2c9b2e4)
+---
+ lib/ns/query.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/lib/ns/query.c b/lib/ns/query.c
+index d3a10be9ba..3bd7daf79c 100644
+--- a/lib/ns/query.c
++++ b/lib/ns/query.c
+@@ -7591,7 +7591,8 @@ query_rpzcname(query_ctx_t *qctx, dns_name_t *cname) {
+ qctx->fname, NULL);
+ if (result == DNS_R_NAMETOOLONG) {
+ client->message->rcode = dns_rcode_yxdomain;
+- } else if (result != ISC_R_SUCCESS) {
++ }
++ if (result != ISC_R_SUCCESS) {
+ return result;
+ }
+ } else {
+--
+2.55.0
+
diff --git a/bind.spec b/bind.spec
index f5dce60..853d9ba 100644
--- a/bind.spec
+++ b/bind.spec
@@ -88,7 +88,7 @@ License: MPL-2.0 AND ISC AND MIT AND BSD-3-Clause AND BSD-2-Clause
# Before rebasing bind, ensure bind-dyndb-ldap is ready to be rebuild and use side-tag with it.
# Updating just bind will cause freeipa-dns-server package to be uninstallable.
Version: 9.18.50
-Release: 1%{?dist}
+Release: 2%{?dist}
Epoch: 32
Url: https://www.isc.org/downloads/bind/
#
@@ -144,6 +144,10 @@ Patch32: bind-9.18-partial-additional-records.patch
Patch33: bind-9.18-dig-idn-input-always.patch
# downstream only too
Patch34: bind-9.18-dig-idn-input-always-test.patch
+# https://gitlab.isc.org/isc-projects/bind9/commit/4fd0755bdd08471f74e6e4c76cd2326f356e0a61
+# https://gitlab.isc.org/isc-projects/bind9/-/work_items/5856
+Patch36: bind-9.18-CVE-2026-11331.patch
+Patch37: bind-9.18-CVE-2026-11331-test.patch
%{?systemd_ordering}
# https://fedoraproject.org/wiki/Changes/RPMSuportForSystemdSysusers
@@ -944,6 +948,9 @@ fi;
%endif
%changelog
+* Tue Aug 25 2026 Petr Menšík <pemensik@redhat.com> - 32:9.18.50-2
+- Potential wildcard CNAME RPZ policy bypass (CVE-2026-11331)
+
* Wed Jun 17 2026 Petr Menšík <pemensik@redhat.com> - 32:9.18.50-1
- Update to 9.18.50 (rhbz#2489833)
- Remove rwtab files
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