CVE-2026-28212 | Firebird has potential server crash via null pointer dereference when processing op_slice packet

Exp

Firebird is an open-source relational database management system. In versions prior to 6.0.0, 5.0.4, 4.0.7 and 3.0.14, when processing an op_slice network packet, the server passes an unprepared structure containing a null pointer to the SDL_info() function, resulting in a null pointer dereference and server crash. An unauthenticated attacker can trigger this by sending a crafted packet to the server port. This issue has been fixed in versions 6.0.0, 5.0.4, 4.0.7 and 3.0.14.

Published: 2026-04-17 Last update: 2026-04-24 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-28212 is rated Exploit Available (50.5/100): CVSS High severity, with low exploitation likelihood (EPSS 0.05%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-28212

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-28212

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-23 0.04% 0.05% +0.01%
2 2026-04-18 — 0.04% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-28212

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-28212

OS Trackers for CVE-2026-28212

vendor priority summary link
debian not yet assigned CVE-2026-28212 not yet assigned priority: Debian including 2 source packages (firebird3.0, firebird4.0), 8 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 4, resolved 4. https://security-tracker.debian.org/tracker/CVE-2026-28212
suse high — https://www.suse.com/security/cve/CVE-2026-28212/
ubuntu medium CVE-2026-28212 medium priority: Ubuntu including 2 source packages (firebird3.0, firebird4.0), 12 status rows across 7 suites (bionic, focal, jammy, noble, questing, resolute, upstream): needs-triage 8, DNE 2, released 2. https://ubuntu.com/security/CVE-2026-28212

Affected software / configurations for CVE-2026-28212

Vendor Product Version Raw CPE
firebirdsql firebird < 3.0.14 cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*
firebirdsql firebird >= 4.0.0, < 4.0.7 cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*
firebirdsql firebird >= 5.0.0, < 5.0.4 cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*

References for CVE-2026-28212

cvelogic Threat Intelligence