mbed TLS up to 1.0.0/3.6.5 FFDH Key Export buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in mbed TLS up to 1.0.0/3.6.5. It has been declared as critical. This affects an unknown part of the component FFDH Key Export Handler. Such manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-34875. No exploit exists.

Detailsinfo

A vulnerability was found in mbed TLS up to 1.0.0/3.6.5. It has been rated as critical. Affected by this issue is some unknown processing of the component FFDH Key Export Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0. A buffer overflow can occur in public key export for FFDH keys.

The advisory is shared for download at mbed-tls.readthedocs.io. This vulnerability is handled as CVE-2026-34875 since 03/31/2026. The exploitation is known to be easy. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/01/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-17993). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/31/2026 CVE reserved
04/01/2026 +1 days Advisory disclosed
04/01/2026 +0 days VulDB entry created
04/01/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: mbed-tls.readthedocs.io
Status: Not defined

CVE: CVE-2026-34875 (🔒)
GCVE (CVE): GCVE-0-2026-34875
GCVE (VulDB): GCVE-100-354752
EUVD: 🔒

Entryinfo

Created: 04/01/2026 20:54
Updated: 04/01/2026 22:15
Changes: 04/01/2026 20:54 (52), 04/01/2026 22:15 (1)
Complete: 🔍
Cache ID: 216:46C:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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