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Fencer Vulns
low 3.7

CVE-2026-25832 json

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.

published 2026-09-14 56 d ago modified 2026-09-22 47 d ago also EUVD-2026-77305

cvss
3.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits
0
none known

Summary

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.

Patch / fix

  • TrustedFirmware Mbed TLS 3.6.7, 4.1.2
  • mbedtls Debian 14 3.6.7-2

debian advisories DEBIAN-CVE-2026-25832

  • mbedtls openSUSE Leap 16.0 3.6.7-bp160.1.1
  • mbedtls-3 openSUSE Tumbleweed 3.6.7-1.1
  • mbedtls openSUSE Tumbleweed 4.2.0-1.1

opensuse advisories openSUSE-SU-2026:21865-1openSUSE-SU-2026:11267-1openSUSE-SU-2026:11215-1

  • mbedtls Alpine 3.23, Alpine 3.22, Alpine 3.21 3.6.7-r0
  • mbedtls Alpine 3.24 4.1.1-r0
  • mbedtls3 Alpine 3.24 3.6.7-r0

alpine advisories ALPINE-CVE-2026-25832

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-25832 updated cvss 3.7

mbedtls: Mbed TLS: TLS 1.3 client accepts unadvertised group in HelloRetryRequest

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
55 d ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

  • TrustedFirmware Mbed TLS

Classification

Weakness
  • CWE-669 Incorrect Resource Transfer Between Spheres

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.