CVE-2026-34874 | mbed TLS up to 3.6.5/4.0.0 null pointer dereference

VDB-354745 · CVE-2026-34874 · EUVD-2026-18003 MBED TLS UP TO 3.6.5/4.0.0 NULL POINTER DEREFERENCE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.3 $0-$5k 1.74 Summaryinfo A vulnerability classified as problematic has been found in mbed TLS up to 3.6.5/4.0.0. The affected element is an unknown function. This manipulation causes null pointer dereference. This vulnerability is registered as CVE-2026-34874. Remote exploitation of the attack is possible. No exploit is available. Detailsinfo A vulnerability classified as problematic was found in mbed TLS up to 3.6.5/4.0.0. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is: An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0. The advisory is shared at mbed-tls.readthedocs.io. This vulnerability is known as CVE-2026-34874 since 03/31/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. 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-2026-18003). Productinfo Name mbed TLS Version 3.6.0 3.6.1 3.6.2 3.6.3 3.6.4 3.6.5 4.0 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.3 VulDB Base Score: 5.3 VulDB Temp Score: 5.3 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: Null pointer dereference CWE: CWE-476 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes 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 04/02/2026 +0 days VulDB entry last update Sourcesinfo Advisory: mbed-tls.readthedocs.io Status: Not defined CVE: CVE-2026-34874 (🔒) GCVE (CVE): GCVE-0-2026-34874 GCVE (VulDB): GCVE-100-354745 EUVD: 🔒 Entryinfo Created: 04/01/2026 20:47 Updated: 04/02/2026 01:37 Changes: 04/01/2026 20:47 (51), 04/02/2026 01:37 (1) Complete: 🔍 Cache ID: 99:681:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸