CVE-2026-34232: Firebird is an open-source relational database management system

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-34232 is a high-severity flaw (CVSS 7.5) affecting firebird. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-228
Published	2026-04-17
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: firebirdsql

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-17 20:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

firebirdsql firebird UPGRADE

Affected: >= 3.0.0 and < 3.0.14 · >= 4.0.0 and < 4.0.7 · >= 5.0.0 and < 5.0.4

Fixed in: 3.0.14, 4.0.7, 5.0.4

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy firebird || rpm -q firebird || firebird --version

2. UPGRADE to 3.0.14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firebird

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firebird

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison firebird sudo apt install firebird=<VERSION_BEFORE_3.0.0> sudo apt-mark hold firebird

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list firebird sudo dnf downgrade firebird-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add firebird

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34232?

firebird: upgrade to 3.0.14, 4.0.7, 5.0.4. Exact commands for each OS are on this page.

Is CVE-2026-34232 being exploited?

CVE-2026-34232 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34232 affect?

CVE-2026-34232 affects firebird. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-34232?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-40342 CRITICAL 9.9 UPGRADE Firebird is an open-source relational database management system
CVE-2026-35215 HIGH 7.5 UPGRADE Firebird is an open-source relational database management system
CVE-2026-27890 HIGH 8.2 UPGRADE Firebird is an open-source relational database management system
CVE-2026-28224 HIGH 8.2 UPGRADE Firebird is an open-source relational database management system
CVE-2026-33337 HIGH 7.5 UPGRADE Firebird is an open-source relational database management system

References

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