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CVE-2026-25832

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts...

3.7 LowFix available

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

0.28%Up 0.1 points since Sep 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 3.7

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Record
CVE-2026-25832
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-669
Updated
2026-11-02
EUVDEUVD-2026-77305 3.7

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Record
EUVD-2026-77305
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-583p-89c4-mqq9 3.7

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts...

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Record
GHSA-583p-89c4-mqq9
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-669
Updated
2026-11-02
NVD 3.7

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Record
CVE-2026-25832
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-669
Updated
2026-11-02
OSVALPINE-CVE-2026-25832 3.7

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Record
ALPINE-CVE-2026-25832
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-03
OSVDEBIAN-CVE-2026-25832 3.7

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Record
DEBIAN-CVE-2026-25832
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
Show 6 moreShow less
OSVUBUNTU-CVE-2026-25832 3.7

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Record
UBUNTU-CVE-2026-25832
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVAZL-103380 No score

CVE-2026-25832 affecting package nodejs 24.20.0-1

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Record
AZL-103380
Updated
2026-11-02
OSVMGASA-2026-0375 No score

Updated mbedtls packages fix security vulnerabilities

TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group. (CVE-2026-25832) Possible buffer overflow in mbedtls_ecdh_calc_secret(). (CVE-2026-35336) X.509 CA bit forgery via invalid basicConstraints extension. (CVE-2026-49300) Use-after-free in mbedtls_pkcs7_free() when reusing a PKCS7 context. (CVE-2026-50579) Remote buffer overflow in TLS 1.2 ECDHE-PSK client handshake. (CVE-2026-50580) Extended master secret calculation failure ignored. (CVE-2026-50581) A 1-byte buffer overread when parsing a malformed ECC public key in the PK module. (CVE-2026-50583) ChaCha20 counter overflow can reuse keystream. (CVE-2026-50584) Incomplete context reset in mbedtls_ssl_session_reset(). (CVE-2026-50585) A potential information disclosure in TLS 1.2 servers using session tickets. If the session ticket write callback failed without setting the lifetime output parameter, Mbed TLS could send 4 bytes of uninitialized stack memory to the peer in the NewSessionTicket message. (CVE-2026-50586) Timing side-channel in RSA PKCS#1 v1.5 decryption. (CVE-2026-50587) Out-of-bounds read in TLS 1.2 EC J-PAKE ServerKeyExchange parsing. (CVE-2026-50588) Ignored TLS 1.3 resumption secret derivation error. (CVE-2026-50640) Heap corruption with early renegotiation after corrupted record in DTLS. (CVE-2026-50713) Side channel leak in ECC optimized modp. (CVE-2026-54435) Signature algorithm restrictions not enforced on certificate chain. (CVE-2026-54441) A random generator fault can compromise TLS data integrity. (CVE-2026-73064)

Record
MGASA-2026-0375
Updated
2026-11-02
OSVopenSUSE-SU-2026:11215-1 No score

libmbedtls23-4.2.0-1.1 on GA media

These are all security issues fixed in the libmbedtls23-4.2.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11215-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:11267-1 No score

libeverest-3.6.7-1.1 on GA media

These are all security issues fixed in the libeverest-3.6.7-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11267-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21865-1 No score

Security update for mbedtls

This update for mbedtls fixes the following issues:

Changes in mbedtls:

  • Update to version 3.6.7:
    • CVE-2026-25832: TLS 1.3 client accepted HRR selecting unadvertised group (boo#1280186)
    • Fix TLS 1.3 clients to reject a HelloRetryRequest whose selected group was not advertised in the original ClientHello
Record
openSUSE-SU-2026:21865-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mbedtls
Alpine:v3.21
 before 3.6.7-r0
3.6.7-r0
mbedtls
Alpine:v3.22
 before 3.6.7-r0
3.6.7-r0
mbedtls
Alpine:v3.23
 before 3.6.7-r0
3.6.7-r0
mbedtls
Alpine:v3.24
 before 4.1.1-r0
4.1.1-r0
mbedtls3
Alpine:v3.24
 before 3.6.7-r0
3.6.7-r0
nodejs
Azure Linux:3
 through 24.20.0-1 None known
mbedtls
Debian:12
 All versions, plus listed versions
2.28.3-12.28.4-12.28.5-12.28.6-12.28.7-1
Show 18 moreShow less
2.28.7-1.12.28.7-1.1~exp12.28.8-13.6.0-13.6.0-23.6.0-33.6.2-13.6.2-23.6.2-33.6.3-13.6.4-13.6.4-23.6.5-0.13.6.5-0.1~deb13u13.6.6-0.13.6.6-0.1~deb13u13.6.7-23.6.7-3
 None known
mbedtls
Debian:13
 All versions, plus listed versions
3.6.4-23.6.5-0.13.6.5-0.1~deb13u13.6.6-0.13.6.6-0.1~deb13u13.6.7-23.6.7-3
 None known
mbedtls
Debian:14
 before 3.6.7-2, plus listed versions
3.6.4-23.6.5-0.13.6.5-0.1~deb13u13.6.6-0.13.6.6-0.1~deb13u1
3.6.7-2
mbedtls
Mageia:10
From an advisory covering 17 CVEs
 before 3.6.7-1.mga10
3.6.7-1.mga10
Show 10 moreShow less
Affected packages
PackageAffectedFixed
mbedtls
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.1.2-12.2.0-12.2.1-12.2.1-22.2.1-2ubuntu0.12.2.1-2ubuntu0.22.2.1-2ubuntu0.3
 None known
mbedtls
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
2.5.1-1ubuntu12.6.0-12.7.0-22.8.0-12.8.0-1ubuntu0.1~esm1
 None known
mbedtls
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2.16.2-12.16.3-12.16.4-1ubuntu22.16.4-1ubuntu2+esm1
 None known
mbedtls
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
2.16.9-0.1ubuntu12.16.11-0.1ubuntu12.16.11-0.32.28.0-12.28.0-1build12.28.0-1ubuntu0.1~esm1
 None known
mbedtls
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
2.28.3-12.28.6-1ubuntu12.28.7-1ubuntu12.28.7-1.1ubuntu12.28.8-12.28.8-1ubuntu0.1~esm1
 None known
mbedtls
Ubuntu:26.10
 All versions, plus listed versions
3.6.5-0.1ubuntu23.6.6-0.1ubuntu13.6.7-3ubuntu1
 None known
mbedtls
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.6.2-3ubuntu13.6.5-0.1ubuntu13.6.5-0.1ubuntu2
 None known
mbedtls
openSUSE:Tumbleweed
From an advisory covering 10 CVEs
 before 4.2.0-1.1
4.2.0-1.1
mbedtls-3
openSUSE:Tumbleweed
From an advisory covering 16 CVEs
 before 3.6.7-1.1
3.6.7-1.1
mbedtls
openSUSE:Leap 16.0
 before 3.6.7-bp160.1.1
3.6.7-bp160.1.1

History

History
RecordedChangedSources
affected, facts
affectedOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-25832 is a low vulnerability (CVSS 3.7) in Arm Mbed Tls, published July 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. Fixed in mbedtls 3.6.7-r0.

References

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