CVE-2026-28214: Firebird is an open-source relational database management system

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MEDIUM 6.5UPGRADE

CVE-2026-28214 is a medium-severity flaw (CVSS 6.5) 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 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 versio

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-190, CWE-835
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 19:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

firebirdsql firebird UPGRADE

Affected: < 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 4.0.0

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 4.0.0 (Debian / Ubuntu)

apt-cache madison firebird sudo apt install firebird=<VERSION_BEFORE_4.0.0> 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_4.0.0> 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-2026-28214?

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

Is CVE-2026-28214 being exploited?

CVE-2026-28214 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-2026-28214 affect?

CVE-2026-28214 affects firebird. Severity is medium (CVSS 6.5). Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the ClumpletReader::getClumpletSize() function can overflow the totalLength value when parsing a Wide type clumplet, causing an

How urgent is CVE-2026-28214?

Priority 44/100. Public exploit reference

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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