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Fencer Vulns
medium 4.8

CVE-2025-52497 json

Mbed TLS before 3.6.4 has a PEM parsing one-byte heap-based buffer underflow, in...

published 2025-07-04 16 mo ago modified 2026-07-23 3 mo ago also EUVD-2025-20082 , JLSEC-2025-229

cvss
4.8
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 26%
public exploits
0
none known

Summary

Mbed TLS before 3.6.4 has a PEM parsing one-byte heap-based buffer underflow, in mbedtls_pem_read_buffer and two mbedtls_pk_parse functions, via untrusted PEM input.

Patch / fix

  • julia MbedTLS_jll 2.28.1010+0
  • Mbed mbedtls 3.6.4
  • mbedtls Debian 14, Debian 13 3.6.4-1

debian advisories DEBIAN-CVE-2025-52497

  • mbedtls Ubuntu Pro 18.04 LTS 2.8.0-1ubuntu0.1~esm1
  • mbedtls Ubuntu Pro 20.04 LTS 2.16.4-1ubuntu2+esm1
  • mbedtls Ubuntu Pro 22.04 LTS 2.28.0-1ubuntu0.1~esm1
  • mbedtls Ubuntu Pro 24.04 LTS 2.28.8-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2025-52497

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mbedtls openSUSE Leap 16.0 3.6.6-bp160.1.1

opensuse advisories openSUSE-SU-2026:21144-1

  • mbedtls Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 3.6.4-r0
  • mbedtls3 Alpine 3.24 3.6.4-r0

alpine advisories ALPINE-CVE-2025-52497

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-2025-52497 updated cvss 4.8

mbedtls: Mbed TLS PEM Parsing Buffer Underflow

  • 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
16 mo ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
OSV 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Affected packages

ecosystem package affected fixed in
julia MbedTLS_jll
<2.28.1010+0
2.28.1010+0

Affected products

  • Mbed mbedtls

Classification

Weakness

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.