[Buildroot] [PATCH] package/mbedtls: security bump to v3.6.6

* [Buildroot] [PATCH] package/mbedtls: security bump to v3.6.6
@ 2026-04-20 20:20 Thomas Perale via buildroot
  2026-04-20 21:02 ` Julien Olivain via buildroot
  2026-05-04 14:47 ` Thomas Perale via buildroot
  0 siblings, 2 replies; 3+ messages in thread
From: Thomas Perale via buildroot @ 2026-04-20 20:20 UTC (permalink / raw)
  To: buildroot; +Cc: Fabrice Fontaine

For more information about the release, see:

- https://github.com/Mbed-TLS/mbedtls/releases/tag/mbedtls-3.6.6
- https://github.com/Mbed-TLS/mbedtls/compare/mbedtls-3.6.5..mbedtls-3.6.6

Fixes the following vulnerabilities:

- CVE-2025-66442
    In Mbed TLS through 4.0.0, there is a compiler-induced timing side
    channel (in RSA and CBC/ECB decryption) that only occurs with LLVM's
    select-optimize feature. TF-PSA-Crypto through 1.0.0 is also affected.

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2025-66442
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations/

- CVE-2026-25833:
    Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow
    in the x509_inet_pton_ipv6() function

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-25833
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-inet-pton/

- CVE-2026-25834:
    Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-25834
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-sigalg-injection/

- CVE-2026-25835:
    Mbed TLS before 3.6.6 and TF-PSA-Crypto before 1.1.0 misuse seeds in a
    Pseudo-Random Number Generator (PRNG).

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-25835
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-rng-cloning/

- CVE-2026-34871:
    An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0
    and TF-PSA-Crypto before 1.1.0. There is a Predictable Seed in a
    Pseudo-Random Number Generator (PRNG).

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-34871
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-dev-random/

- CVE-2026-34872:
    An issue was discovered in Mbed TLS 3.5.x and 3.6.x through 3.6.5 and
    TF-PSA-Crypto 1.0. There is a lack of contributory behavior in FFDH
    due to improper input validation. Using finite-field Diffie-Hellman,
    the other party can force the shared secret into a small set of values
    (lack of contributory behavior). This is a problem for protocols that
    depend on contributory behavior (which is not the case for TLS). The
    attack can be carried by the peer, or depending on the protocol by an
    active network attacker (person in the middle).

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-34872
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-ffdh-peerkey-checks/

- CVE-2026-34873:
    An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client
    impersonation can occur while resuming a TLS 1.3 session.

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-34873
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-client-impersonation-while-resuming-tls13-session/

- CVE-2026-34874:
    An issue was discovered in Mbed TLS through 3.6.5 and 4.x through
    4.0.0. There is a NULL pointer dereference in distinguished name
    parsing that allows an attacker to write to address 0.

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-34874
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-null-pointer-dereference-x509/

- CVE-2026-34875:
    An issue was discovered in Mbed TLS through 3.6.5 and TF-PSA-Crypto
    1.0.0. A buffer overflow can occur in public key export for FFDH keys.

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-34875
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-ffdh-buffer-overflow/

- CVE-2026-34876:
    An issue was discovered in Mbed TLS 3.x before 3.6.6. An out-of-bounds
    read vulnerability in mbedtls_ccm_finish() in library/ccm.c allows
    attackers to obtain adjacent CCM context data via invocation of the
    multipart CCM API with an oversized tag_len parameter. This is caused
    by missing validation of the tag_len parameter against the size of the
    internal 16-byte authentication buffer. The issue affects the public
    multipart CCM API in Mbed TLS 3.x, where mbedtls_ccm_finish() can be
    invoked directly by applications. In Mbed TLS 4.x versions prior to
    the fix, the same missing validation exists in the internal
    implementation; however, the function is not exposed as part of the
    public API. Exploitation requires application-level invocation of the
    multipart CCM API.

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-34876
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-ccm-finish-boundary-check/

- CVE-2026-34877:
    An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5,
    Mbed TLS 4.0.0. Insufficient protection of serialized SSL context or
    session structures allows an attacker who can modify the serialized
    structures to induce memory corruption, leading to arbitrary code
    execution. This is caused by Incorrect Use of Privileged APIs.

For more information, see:
 - https://www.cve.org/CVERecord?id=CVE-2026-34877
 - https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-serialized-data/

Signed-off-by: Thomas Perale <thomas.perale@mind.be>
---
 package/mbedtls/mbedtls.hash | 4 ++--
 package/mbedtls/mbedtls.mk   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/package/mbedtls/mbedtls.hash b/package/mbedtls/mbedtls.hash
index b86c66af3e..f1be074e08 100644
--- a/package/mbedtls/mbedtls.hash
+++ b/package/mbedtls/mbedtls.hash
@@ -1,4 +1,4 @@
-# From https://github.com/Mbed-TLS/mbedtls/releases/tag/mbedtls-3.6.5:
-sha256  4a11f1777bb95bf4ad96721cac945a26e04bf19f57d905f241fe77ebeddf46d8  mbedtls-3.6.5.tar.bz2
+# From https://github.com/Mbed-TLS/mbedtls/releases/tag/mbedtls-3.6.6:
+sha256  8fb65fae8dcae5840f793c0a334860a411f884cc537ea290ce1c52bb64ca007a  mbedtls-3.6.6.tar.bz2
 # Locally calculated
 sha256  9b405ef4c89342f5eae1dd828882f931747f71001cfba7d114801039b52ad09b  LICENSE
diff --git a/package/mbedtls/mbedtls.mk b/package/mbedtls/mbedtls.mk
index c1aa9f0850..e8bb0a71b9 100644
--- a/package/mbedtls/mbedtls.mk
+++ b/package/mbedtls/mbedtls.mk
@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MBEDTLS_VERSION = 3.6.5
+MBEDTLS_VERSION = 3.6.6
 MBEDTLS_SITE = https://github.com/Mbed-TLS/mbedtls/releases/download/mbedtls-$(MBEDTLS_VERSION)
 MBEDTLS_SOURCE = mbedtls-$(MBEDTLS_VERSION).tar.bz2
 MBEDTLS_CONF_OPTS = \
-- 
2.53.0

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