CVE-2025-52497

Publication date 4 July 2025

Last updated 25 March 2026

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
mbedtls	25.10 questing	Vulnerable
	25.04 plucky	Ignored end of life, was needed
	24.10 oracular	Ignored end of life, was needs-triage
	24.04 LTS noble	Fixed 2.28.8-1ubuntu0.1~esm1
	22.04 LTS jammy	Fixed 2.28.0-1ubuntu0.1~esm1
	20.04 LTS focal	Fixed 2.16.4-1ubuntu2+esm1
	18.04 LTS bionic	Fixed 2.8.0-1ubuntu0.1~esm1
	16.04 LTS xenial	Vulnerable

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
mbedtls	Upstream: 6165e71 Upstream: 9325883

Severity score breakdown

Parameter	Value
Base score	4.8 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

References

Related Ubuntu Security Notices (USN)

USN-8123-1
Mbed TLS vulnerabilities
25 March 2026