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unbound: patch CVE-2026-50251

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Details:
https://nvd.nist.gov/vuln/detail/cve-2026-50251

Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
This commit is contained in:
Ankur Tyagi
2026-09-15 10:14:00 +05:30
committed by Anuj Mittal
parent 252dc099d1
commit ad6d182534
2 changed files with 73 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta-networking/recipes-support/unbound/unbound/CVE-2026-50251.patch
+72
View File
@@ -0,0 +1,72 @@
From 2a514d577f035b1473d34201290be4394c732ff7 Mon Sep 17 00:00:00 2001
From: "W.C.A. Wijngaards" <wouter@nlnetlabs.nl>
Date: Wed, 22 Jul 2026 10:15:02 +0200
Subject: [PATCH] - Fix CVE-2026-50251, Attacker supplied `0.0.0.0`/`::` glue
triggers defensive full-cache flush. Thanks to Qifan Zhang, Palo Alto
Networks, for the report.
(cherry picked from commit e180b06298d8d39a764d3c5d4d4aca472c3a97d7)
CVE: CVE-2026-50251
Upstream-Status: Backport [https://github.com/NLnetLabs/unbound/commit/e180b06298d8d39a764d3c5d4d4aca472c3a97d7]
Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
---
doc/unbound.conf.rst | 7 +++++++
iterator/iter_donotq.c | 12 ++++++++++++
testdata/dns_error_reporting.rpl | 1 +
3 files changed, 20 insertions(+)
diff --git a/doc/unbound.conf.rst b/doc/unbound.conf.rst
index d83816c6f..ca96a4411 100644
--- a/doc/unbound.conf.rst
+++ b/doc/unbound.conf.rst
@@ -1954,6 +1954,13 @@ These options are part of the **server:** clause.
flushing away any poison.
A value of 10 million is suggested.
+ It is useful to add 0.0.0.0/8 and '::' to the
+ :ref:`do-not-query-address<unbound.conf.do-not-query-address>` list.
+ Otherwise they may be answered, from localhost, and the different source
+ makes an unwanted reply that unnecessarily ticks up.
+ The :ref:`do-not-query-localhost<unbound.conf.do-not-query-localhost>`
+ option includes them, the zero subnets, when it is enabled.
+
Default: 0 (disabled)
diff --git a/iterator/iter_donotq.c b/iterator/iter_donotq.c
index 40ffb45c4..7eecf1354 100644
--- a/iterator/iter_donotq.c
+++ b/iterator/iter_donotq.c
@@ -132,6 +132,18 @@ donotq_apply_cfg(struct iter_donotq* dq, struct config_file* cfg)
if(cfg->do_ip6) {
if(!donotq_str_cfg(dq, "::1"))
return 0;
+ if(!donotq_str_cfg(dq, "::ffff:127.0.0.0/104"))
+ return 0;
+ }
+ /* RFC 1122 3.2.1.3 / RFC 6890 / RFC 4291 2.5.2: not valid as
+ * destination; on Linux these route to the local host. */
+ if(!donotq_str_cfg(dq, "0.0.0.0/8"))
+ return 0;
+ if(cfg->do_ip6) {
+ if(!donotq_str_cfg(dq, "::"))
+ return 0;
+ if(!donotq_str_cfg(dq, "::ffff:0:0/96"))
+ return 0;
}
}
addr_tree_init_parents(&dq->tree);
diff --git a/testdata/dns_error_reporting.rpl b/testdata/dns_error_reporting.rpl
index f1fac12a2..22175cade 100644
--- a/testdata/dns_error_reporting.rpl
+++ b/testdata/dns_error_reporting.rpl
@@ -12,6 +12,7 @@ server:
ede: no # It is not needed for dns-error-reporting; only for clients to receive EDEs
dns-error-reporting: yes
do-ip6: no
+ do-not-query-localhost: no
stub-zone:
name: domain
meta-networking/recipes-support/unbound/unbound_1.24.2.bb
+1
View File
@@ -32,6 +32,7 @@ SRC_URI = "git://github.com/NLnetLabs/unbound.git;protocol=https;branch=master;t
file://CVE-2026-50046.patch \
file://CVE-2026-50243.patch \
file://CVE-2026-50248.patch \
file://CVE-2026-50251.patch \
"
SRCREV = "f6269baa605d31859f28770e01a24e3677e5f82c"