CVE-2026-27890

highpriority · track · 0EPSS 0.005 · 40 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.46% (40th) EPSS

CVSS 8.2 · high

Is it mine?

14 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-28

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array class's grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

cvss

Technical severity, 0–10. One row per scoring source.

8.2

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.2highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Hsecondary · FSTEC (BDU) RU

v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Hsecondary · ENISA EU

v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Hsecondary · security-advisories@github.comexploitability 3.9 · impact 4.2

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119USCWE-119USCWE-787USCWE-787US

affected products (14)

Products and version ranges known to be affected.

FirebirdSQL firebird3.0.0, → 3.0.14enisa_euvdEU
FirebirdSQL firebird4.0.0, → 4.0.7enisa_euvdEU
FirebirdSQL firebird5.0.0, → 5.0.4enisa_euvdEU
Firebird Foundation Inc. Firebird≤ 3.0.14fstec_bduRU
Firebird Foundation Inc. Firebird≤ 4.0.7fstec_bduRU
Firebird Foundation Inc. Firebird≤ 5.0.4fstec_bduRU
Firebird Foundation Inc. Firebird≤ 6.0fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 8.0fstec_bduRU
ООО «Ред Софт» Ред База Данных3.0.0 → 3.0.22fstec_bduRU
ООО «Ред Софт» Ред База Данных5.0.0 → 5.1.5fstec_bduRU
firebirdsql firebird< 3.0.14nvdUScpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*
firebirdsql firebird4.0.0 → 4.0.7nvdUScpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*
firebirdsql firebird5.0.0 → 5.0.4nvdUScpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2026-04-17modified 2026-10-26

references (11)

External citations — patches, advisories, analysis.

scry

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