CVE-2025-52497: 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.

Overview

Severity

Medium (CVSS 4.8)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Exploit Status

Not Exploited

Patch Tuesday

2025-Jul

Released

2026-09-03

EPSS Score

0.28% (percentile: 19.8%)

Affected Products (1)

Other

• 21780-17084

Security Updates (1)

• Security Update

Revision History

• 2026-09-03: Information published.