CVE-2026-40944: Github.com/oxia db/oxia Oxia's TLS CA Certificate Chain Vulnerability

HIGH
Advisory Identifier: GHSA-7jrq-q4pq-rhm6
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CWE-295
Published
Advisory Summary

CVE-2026-40944 is a HIGH oxia's tls ca certificate chain vulnerability (CWE-295: Improper Certificate Validation) affecting Github.com/oxia db/oxia libraries in the Go ecosystem. The issue involves oxia's tls ca certificate chain validation fails with multi-certificate pem bundles. Remediation is available by upgrading affected packages to version 0.16.2.

CVE-2026-40944 at a Glance

CVE Identifier CVE-2026-40944
GHSA Identifier GHSA-7jrq-q4pq-rhm6
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-295: Improper Certificate Validation
Affected Product Github.com/oxia db/oxia
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-40944

To remediate this vulnerability, upgrade all affected Github.com/oxia db/oxia dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/oxia-db/oxia fixed: 0.16.2 
Upgrade github.com/oxia-db/oxia to 0.16.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/oxia-db/oxia

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-40944, inspect your project dependencies for Github.com/oxia db/oxia:

inspect dependencies for github.com/oxia-db/oxia

Analyze the terminal output to locate any version of Github.com/oxia db/oxia in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.16.2), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Github.com/oxia db/oxia, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary 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. ### Impact In deployments using mTLS with certificate chains (intermediate CA + root CA bundles), legitimate clients with properly chained certificates are rejected with `x509: certificate signed by unknown authority`. This degrades the security posture by making mTLS unusable with standard CA chain configurations, potentially forcing operators to disable client certificate verification. All versions using TLS with `trustedCaFile` configuration are affected. ### Details In `common/security/tls.go`, the `trustedCertPool()` method calls `pem.Decode()` only once, processing a single PEM block. The remaining bytes (containing additional certificates) are silently discarded. Additionally, the error return from `pem.Decode` is ignored, so a corrupted CA file results in an empty certificate pool without any error. ### Patches Fixed by iterating over all PEM blocks in the file, parsing each CERTIFICATE block, and returning an error if no valid certificates are found. ### Workarounds Use CA files containing only a single certificate (the direct issuer of client certificates, not a chain).

CVE-2026-40944 Affected Github.com/oxia db/oxia Versions

1 component(s)
Fixed Versions:
0.16.2
Product / Package Ecosystem Affected Versions Fixed Version
github.com/oxia-db/oxia
golang/github.com/oxia-db/oxia
Go
< 0.16.2
0.16.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/oxia-db/oxia/security/advisories/GHSA-7jrq-q4pq-rhm6
NVD — CVE-2026-40944 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40944
Github.com/oxia db/oxia Source Repository REPOSITORY
https://github.com/oxia-db/oxia

Frequently Asked Questions

What is CVE-2026-40944?
CVE-2026-40944 is a security vulnerability in Github.com/oxia db/oxia involving Oxia's TLS CA certificate chain validation fails with multi-certificate PEM bundles under CWE-295: Improper Certificate Validation.
Which Github.com/oxia db/oxia versions are affected?
Affected versions include releases prior to 0.16.2 across affected packages: github.com/oxia-db/oxia.
What version fixes CVE-2026-40944?
Upgrading to 0.16.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/oxia-db/oxia affected?
Yes, github.com/oxia-db/oxia is affected in releases prior to 0.16.2. Upgrade your dependency to 0.16.2 or later.
What CWE is associated with CVE-2026-40944?
CVE-2026-40944 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).
How can I check Go dependencies for CVE-2026-40944?
Run the dependency tree command: 'inspect dependencies for github.com/oxia-db/oxia'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7jrq-q4pq-rhm6",
  "modified" : "2026-04-24T20:39:58Z",
  "published" : "2026-04-14T23:15:16Z",
  "aliases" : [ "CVE-2026-40944" ],
  "summary" : "Oxia's TLS CA certificate chain validation fails with multi-certificate PEM bundles",
  "details" : "### Summary\nThe `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.\n\n### Impact\nIn deployments using mTLS with certificate chains (intermediate CA + root CA bundles), legitimate clients with properly chained certificates are rejected with `x509: certificate signed by unknown authority`. This degrades the security posture by making mTLS unusable with standard CA chain configurations, potentially forcing operators to disable client certificate verification.\n\nAll versions using TLS with `trustedCaFile` configuration are affected.\n\n### Details\nIn `common/security/tls.go`, the `trustedCertPool()` method calls `pem.Decode()` only once, processing a single PEM block. The remaining bytes (containing additional certificates) are silently discarded. Additionally, the error return from `pem.Decode` is ignored, so a corrupted CA file results in an empty certificate pool without any error.\n\n### Patches\nFixed by iterating over all PEM blocks in the file, parsing each CERTIFICATE block, and returning an error if no valid certificates are found.\n\n### Workarounds\nUse CA files containing only a single certificate (the direct issuer of client certificates, not a chain).",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/oxia-db/oxia"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.16.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.16.1"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/oxia-db/oxia/security/advisories/GHSA-7jrq-q4pq-rhm6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-40944"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/oxia-db/oxia"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-14T23:15:16Z",
    "nvd_published_at" : "2026-04-21T22:16:19Z"
  }
}