Inefficient regular expression complexity in jackson-core - CVE-2026-89407
Published: September 23, 2026
Vulnerability identifier: #VU151854
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-89407
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient regular expression complexity in the NumberInput.PATTERN_FLOAT regular expression when processing attacker-controlled numeric-looking strings through looksLikeValidNumber(). A remote attacker can submit a crafted numeric-looking string to cause a denial of service.
Applications that coerce String-typed JSON fields to numbers can invoke the affected validation path.
Affected software
jackson-core
How to mitigate CVE-2026-89407
Install security update from vendor's website.
jackson-core - addressed in versions 2.18.11, 2.21.7, 2.22.3, 3.1.7, 3.2.2