NULL pointer dereference in Firebird - CVE-2026-28212
Published: April 20, 2026
Vulnerability identifier: #VU126557
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-28212
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: firebird.sourceforge.net
Affected software:
Firebird
Firebird
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in xdr_slice() when processing an op_slice packet. A remote attacker can send a specially crafted packet to cause a denial of service.
The issue is triggered when slice_response->p_slr_sdl is unprepared and contains a null pointer that is passed to SDL_info(), causing the server to crash with SIGSEGV.
How to mitigate CVE-2026-28212
Install security update from vendor's website.