CVE-2026-35091 | Corosync UDP Packet function return value

VDB-354660 · CVE-2026-35091 · GCVE-0-2026-35091 COROSYNC UDP PACKET FUNCTION RETURN VALUE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.6 $0-$5k 0.95+ Summaryinfo A vulnerability described as critical has been identified in Corosync. This impacts an unknown function of the component UDP Packet Handler. The manipulation results in function return value. This vulnerability is known as CVE-2026-35091. It is possible to launch the attack remotely. No exploit is available. It is advisable to implement a patch to correct this issue. Detailsinfo A vulnerability was found in Corosync (unknown version). It has been classified as critical. Affected is an unknown code block of the component UDP Packet Handler. The manipulation with an unknown input leads to a function return value vulnerability. CWE is classifying the issue as CWE-253. The product incorrectly checks a return value from a function, which prevents it from detecting errors or exceptional conditions. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes: A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents. This vulnerability affects Corosync when running in totemudp/totemudpu mode, which is the default configuration. The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2026-35091 since 04/01/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. Applying a patch is able to eliminate this problem. Productinfo Name Corosync CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.7 VulDB Meta Temp Score: 7.6 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.2 CNA Vector (redhat): 🔒 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: Function return value CWE: CWE-253 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: Patch Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/01/2026 Advisory disclosed 04/01/2026 +0 days CVE reserved 04/01/2026 +0 days VulDB entry created 04/01/2026 +0 days VulDB entry last update Sourcesinfo Advisory: access.redhat.com Status: Confirmed CVE: CVE-2026-35091 (🔒) GCVE (CVE): GCVE-0-2026-35091 GCVE (VulDB): GCVE-100-354660 Entryinfo Created: 04/01/2026 15:38 Changes: 04/01/2026 15:38 (60) Complete: 🔍 Cache ID: 99:5BF:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸