CVE-2026-40943 Oxia: Server crash via race condition in session heartbeat handling
A race condition in Oxia's session heartbeat handling allows attackers to crash the server via a panic or deadlock.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40943?
CVE-2026-40943 is a high-severity vulnerability in oxia-db oxia, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-362
Which versions are affected by CVE-2026-40943?
3 open source packages ship an affected version, including github.com/oxia-db/oxia.
| Package | Affected | Fixed in |
|---|---|---|
github.com/oxia-db/oxia Go | All versions | 0.16.2 |
github.com/oxia-db/oxia Go | All versions | 0.16.2 |
github.com/oxia-db/oxia Go | All versions | 0.16.2 |
How do I fix CVE-2026-40943?
Upgrade github.com/oxia-db/oxia to 0.16.2 or later.
Is CVE-2026-40943 being exploited?
There is no known exploitation of CVE-2026-40943 in the wild and no public exploit code.
Sources
Also known as GHSA-5gqc-qhrj-9xw8, GO-2026-5145.