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CVE-2026-40943— Oxia: Server crash via race condition in session heartbeat handling

Quick assessment

Affected
oxia-db oxia
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

oxia是Oxia开源的一个分布式元数据存储与协调系统。 Oxia 0.16.2之前版本存在竞争条件问题漏洞，该漏洞源于会话心跳处理和会话关闭之间存在竞争条件，可能导致服务器因在已关闭通道上发送而崩溃。

AI Predicted 5.3 Difficulty: Hard EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-40943

Vulnerability Information
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Vulnerability Title
Oxia: Server crash via race condition in session heartbeat handling
Source: CVE Program / CVE List V5
Vulnerability Description
Oxia is a metadata store and coordination system. Prior to 0.16.2, a race condition between session heartbeat processing and session closure can cause the server to panic with send on closed channel. The heartbeat() method uses a blocking channel send while holding a mutex, and under specific timing with concurrent close() calls, this can lead to either a deadlock (channel buffer full) or a panic (send on closed channel after TOCTOU gap in KeepAlive). This vulnerability is fixed in 0.16.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
oxia 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
oxia是Oxia开源的一个分布式元数据存储与协调系统。 Oxia 0.16.2之前版本存在竞争条件问题漏洞，该漏洞源于会话心跳处理和会话关闭之间存在竞争条件，可能导致服务器因在已关闭通道上发送而崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
oxia-db oxia < 0.16.2 -

II. Public POCs for CVE-2026-40943

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III. Intelligence Information for CVE-2026-40943

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Vendor Advisories for CVE-2026-40943 (1)

Same Patch Batch · oxia-db · 2026-04-21 · 4 CVEs total

CVE-2026-40945 Oxia: Bearer token exposed in debug log messages on authentication failure
CVE-2026-40944 Oxia: TLS CA certificate chain validation fails with multi-certificate PEM bundles
CVE-2026-40946 Oxia: OIDC token audience validation bypass via SkipClientIDCheck

IV. Related Vulnerabilities

Same product: oxia
Same vendor: oxia-db
Same weakness: CWE-362

V. Comments for CVE-2026-40943

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