CVE-2026-27889 | nats-io nats-server WebSocket Frame wsRead integer overflow

VDB-353481 · CVE-2026-27889 · GCVE-0-2026-27889 NATS-IO NATS-SERVER WEBSOCKET FRAME WSREAD INTEGER OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 1.44+ Summaryinfo A vulnerability identified as problematic has been detected in nats-io nats-server. The impacted element is the function wsRead of the component WebSocket Frame Handler. Performing a manipulation results in integer overflow. This vulnerability is identified as CVE-2026-27889. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component. Detailsinfo A vulnerability was found in nats-io nats-server (affected version not known). It has been classified as problematic. This affects the function wsRead of the component WebSocket Frame Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on availability. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-27889. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. Upgrading eliminates this vulnerability. Productinfo Vendor nats-io Name nats-server CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.1 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 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: Integer overflow CWE: CWE-190 / CWE-189 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: 🔒 Timelineinfo 03/25/2026 Advisory disclosed 03/25/2026 +0 days VulDB entry created 03/25/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-27889 (🔒) GCVE (CVE): GCVE-0-2026-27889 GCVE (VulDB): GCVE-100-353481 Entryinfo Created: 03/25/2026 20:20 Changes: 03/25/2026 20:20 (51) Complete: 🔍 Cache ID: 99:B84:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸