CVE-2026-40613 | Coturn up to 4.9.x type conversion

VDB-358551 · CVE-2026-40613 · GCVE-0-2026-40613 COTURN UP TO 4.9.X TYPE CONVERSION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.3 $0-$5k 1.16+ Summaryinfo A vulnerability marked as problematic has been reported in Coturn up to 4.9.x. The affected element is an unknown function. Performing a manipulation results in type conversion. This vulnerability is identified as CVE-2026-40613. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component. Detailsinfo A vulnerability classified as problematic has been found in Coturn up to 4.9.x. This affects an unknown code. The manipulation with an unknown input leads to a type conversion vulnerability. CWE is classifying the issue as CWE-704. The product does not correctly convert an object, resource, or structure from one type to a different type. This is going to have an impact on availability. The summary by CVE is: Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-40613 since 04/14/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. Upgrading to version 4.10.0 eliminates this vulnerability. Productinfo Name Coturn Version 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Website Product: https://github.com/coturn/coturn/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.4 VulDB Meta Temp Score: 6.3 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.5 CNA Vector (GitHub_M): 🔒 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: Type conversion CWE: CWE-704 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: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Coturn 4.10.0 Timelineinfo 04/14/2026 CVE reserved 04/21/2026 +7 days Advisory disclosed 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-40613 (🔒) GCVE (CVE): GCVE-0-2026-40613 GCVE (VulDB): GCVE-100-358551 Entryinfo Created: 04/21/2026 20:56 Changes: 04/21/2026 20:56 (61) Complete: 🔍 Cache ID: 99:8E1:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸