CVE-2026-5190 | AWS aws-c-event-stream up to 0.5.x event-stream Message out-of-bounds write

VDB-354457 · CVE-2026-5190 · GCVE-0-2026-5190 AWS AWS-C-EVENT-STREAM UP TO 0.5.X EVENT-STREAM MESSAGE OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.1 $0-$5k 1.31+ Summaryinfo A vulnerability was found in AWS aws-c-event-stream up to 0.5.x. It has been classified as critical. This issue affects some unknown processing of the component event-stream Message Handler. This manipulation causes out-of-bounds write. This vulnerability is tracked as CVE-2026-5190. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended. Detailsinfo A vulnerability classified as critical was found in AWS aws-c-event-stream up to 0.5.x. Affected by this vulnerability is an unknown code block of the component event-stream Message Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: Out-of-bounds write in the streaming decoder component in aws-c-event-stream before 0.6.0 might allow a third party operating a server to cause memory corruption leading to arbitrary code execution on a client application that processes crafted event-stream messages. To remediate this issue, users should upgrade to version 0.6.0 or later. The advisory is shared at aws.amazon.com. This vulnerability is known as CVE-2026-5190 since 03/30/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. Upgrading to version 0.6.0 eliminates this vulnerability. Productinfo Vendor AWS Name aws-c-event-stream Version 0.1 0.2 0.3 0.4 0.5 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 6.2 VulDB Meta Temp Score: 6.1 VulDB Base Score: 5.0 VulDB Temp Score: 4.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.5 CNA Vector (AMZN): 🔒 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: Out-of-bounds write CWE: CWE-787 / CWE-119 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: aws-c-event-stream 0.6.0 Timelineinfo 03/30/2026 CVE reserved 03/31/2026 +1 days Advisory disclosed 03/31/2026 +0 days VulDB entry created 03/31/2026 +0 days VulDB entry last update Sourcesinfo Advisory: aws.amazon.com Status: Confirmed CVE: CVE-2026-5190 (🔒) GCVE (CVE): GCVE-0-2026-5190 GCVE (VulDB): GCVE-100-354457 Entryinfo Created: 03/31/2026 20:02 Changes: 03/31/2026 20:02 (76) Complete: 🔍 Cache ID: 99:BC6:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸