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Fencer Vulns
medium 5.3

CVE-2025-59438 json

Padding oracle through timing of cipher error reporting

published 2025-10-21 12 mo ago modified 2026-11-05 3 d ago also EUVD-2025-35171 , JLSEC-2025-233

cvss
5.3
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 18%
public exploits
0
none known

Summary

Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.

Patch / fix

  • arm mbed_tls 3.6.5
  • mbedtls Debian 13 3.6.5-0.1~deb13u1
  • mbedtls Debian 14 3.6.5-0.1

debian advisories DEBIAN-CVE-2025-59438

  • ovmf SLE Module for Server Applications 15 SP7, SLE Module for Package Hub 15 SP7 202408-150700.3.15.1
  • ovmf SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 202502-160000.4.1
  • ovmf Linux Micro 6.1 202402-slfo.1.1_2.1

suse advisories SUSE-SU-2026:1413-1SUSE-SU-2026:21018-1SUSE-SU-2026:21161-1SUSE-SU-2026:20769-1

  • mbedtls-2 openSUSE Leap 16.0 2.28.10-bp160.2.1
  • mbedtls-2 openSUSE Tumbleweed 2.28.10-5.1
  • mbedtls openSUSE Leap 16.0 3.6.6-bp160.1.1
  • ovmf openSUSE Leap 16.0 202502-160000.4.1
  • ovmf openSUSE Tumbleweed 202602-5.1
  • vlang openSUSE Tumbleweed 0.5-2.1
  • mbedtls openSUSE Tumbleweed 3.6.5-1.1
  • micropython openSUSE Leap 16.0 1.26.0-bp160.1.1

opensuse advisories openSUSE-SU-2026:21864-1openSUSE-SU-2026:11790-1openSUSE-SU-2026:21144-1openSUSE-SU-2026:20499-1openSUSE-SU-2026:10378-1openSUSE-SU-2026:10083-1

  • mbedtls Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 3.6.5-r0
  • mbedtls3 Alpine 3.24 3.6.5-r0

alpine advisories ALPINE-CVE-2025-59438

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-2025-59438 updated cvss 4.4

mbedtls: MbedTLS Padding oracle through timing of cipher error reporting

  • 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
12 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
julia MbedTLS_jll
all versions
 no fix listed

Classification

Weakness
  • CWE-208 Observable Timing Discrepancy

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.