# CVE-2026-34232: Firebird: DoS via `op_response` packet from client

> An unauthenticated attacker can crash the Firebird database server by sending a crafted op_response packet, requiring an upgrade to patched versions.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **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-2026-34232, ECHO-b431-1233-2fe4, GHSA-7jq3-6j3c-5cm2, UBUNTU-CVE-2026-34232

## What is CVE-2026-34232?

CVE-2026-34232 is a high-severity denial of service vulnerability in FirebirdSQL firebird, published on 17 Apr 2026. An attacker can exploit it over the internet without logging in, 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 xdr_status_vector() function does not handle the isc_arg_cstring type when decoding an op_response packet, causing a server crash when one is encountered in the status vector. An unauthenticated attacker can exploit this by sending a crafted op_response packet to the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

Weakness: CWE-228 (Improper Handling of Syntactically Invalid Structure)

## Which versions are affected by CVE-2026-34232?

It affects 1 product.


Products: Firebirdsql Firebird.

## How do I fix CVE-2026-34232?

Upgrade to a fixed version.

## Is CVE-2026-34232 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34232 exists.

## 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-2026-34232 and fix it if it is affected.

What it is: CVE-2026-34232 is a high-severity denial of service vulnerability in FirebirdSQL firebird, published on 17 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34232 exists.

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-2026-34232/ (Markdown: https://insights.sbomify.com/CVE-2026-34232/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34232
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34232
- OSV: https://osv.dev/vulnerability/CVE-2026-34232

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34232/
Summaries are generated and may contain mistakes; the official description above is the record.