CVE-2026-40944 Oxia: TLS CA certificate chain validation fails with multi-certificate PEM bundles
Attackers can bypass TLS certificate chain validation in Oxia by exploiting a bug that ignores multiple certificates in CA bundles, undermining mTLS security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40944?
CVE-2026-40944 is a medium-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, the trustedCertPool() function in the TLS configuration only parses the first PEM block from CA certificate files. When a CA bundle contains multiple certificates (e.g., intermediate + root CA), only the first certificate is loaded. This silently breaks certificate chain validation for mTLS. This vulnerability is fixed in 0.16.2.
Weakness: CWE-295
Which versions are affected by CVE-2026-40944?
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-2026-40944?
Upgrade github.com/oxia-db/oxia to 0.16.2 or later.
Is CVE-2026-40944 being exploited?
There is no known exploitation of CVE-2026-40944 in the wild and no public exploit code.
Sources
Also known as GHSA-7jrq-q4pq-rhm6, GO-2026-5226.