CVE-2026-34875 | mbed TLS up to 1.0.0/3.6.5 FFDH Key Export buffer overflow

VDB-354752 · CVE-2026-34875 · EUVD-2026-17993 MBED TLS UP TO 1.0.0/3.6.5 FFDH KEY EXPORT BUFFER OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.5 $0-$5k 1.71+ 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). Productinfo Name mbed TLS Version 1.0 3.6.0 3.6.1 3.6.2 3.6.3 3.6.4 3.6.5 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 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock 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 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock 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: 99:C5E:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸