# CVE-2026-28214: Firebird server hangs when using specific clumplet on batch creation

> An authenticated user can cause a denial of service in Firebird database server via an integer overflow leading to an infinite loop during batch creation.

- **Severity:** Medium 6.0 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Apr 2026
- **Updated:** 20 Apr 2026
- **Also known as:** DEBIAN-CVE-2026-28214, ECHO-fb89-2007-348d, GHSA-7cq5-994r-jhrf, UBUNTU-CVE-2026-28214

## What is CVE-2026-28214?

CVE-2026-28214 is a medium-severity vulnerability in FirebirdSQL firebird, published on 17 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the ClumpletReader::getClumpletSize() function can overflow the totalLength value when parsing a Wide type clumplet, causing an infinite loop. An authenticated user with INSERT privileges on any table can exploit this via a crafted Batch Parameter Block to cause a denial of service against the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

Weakness: CWE-835 (Loop with Unreachable Exit Condition), CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2026-28214?

It affects 1 product.


Products: Firebirdsql Firebird.

## How do I fix CVE-2026-28214?

Upgrade to a fixed version.

## Is CVE-2026-28214 being exploited?

There is no known exploitation of CVE-2026-28214 in the wild and no public exploit code.

## Other vulnerabilities in FirebirdSQL firebird

- [CVE-2026-40342](https://insights.sbomify.com/CVE-2026-40342/): Firebird: Path Traversal + Arbitrary File Write Leads to Remote Code Execution (critical 10.0)
- [CVE-2008-0467](https://insights.sbomify.com/CVE-2008-0467/): Memory corruption in n/a (critical 10.0)
- [CVE-2007-4992](https://insights.sbomify.com/CVE-2007-4992/): Memory corruption in n/a (critical 10.0)
- [CVE-2007-5245](https://insights.sbomify.com/CVE-2007-5245/): Memory corruption in n/a (critical 10.0)
- [CVE-2007-5246](https://insights.sbomify.com/CVE-2007-5246/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-28214 and fix it if it is affected.

What it is: CVE-2026-28214 is a medium-severity vulnerability in FirebirdSQL firebird, published on 17 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-28214 in the wild and no public exploit code.

Affected product: FirebirdSQL firebird. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-28214/ (Markdown: https://insights.sbomify.com/CVE-2026-28214/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-28214
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-28214
- OSV: https://osv.dev/vulnerability/CVE-2026-28214

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-28214/
Summaries are generated and may contain mistakes; the official description above is the record.