What is the CVSS score of CVE-2026-3257?

CVE-2026-3257 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-3257?

Within 24 hours: Inventory all systems and applications using UnQLite for Perl and assess business criticality. Within 7 days: Isolate or restrict network access to affected systems, disable UnQLite functionality where non-essential, and contact vendors for patch timelines. Within 30 days: Migrate to patched versions or alternative database solutions, implement enhanced monitoring for exploitation attempts, and conduct security assessment of affected systems.

Unqlite CVE-2026-3257

CRITICAL

2026-03-05 9b29abf9-4ab0-4765-b253-1875cd9b441e

Heap Overflow Unqlite Tokuhirom

9.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Craft malicious input to Perl UnQLite module
Exploit

Trigger heap-based overflow in embedded 2014 library
Impact

Execute arbitrary code with application privileges

Vulnerability Assessment

Exploitation Conditions	UnQLite for Perl module version 0.06 or earlier installed with embedded UnQLite library from 2014. Remote unauthenticated exploitation possible if application processes untrusted data through UnQLite operations.
Impact	CVSS 9.8.
Exploit ScenarioDerived	Exploit known UnQLite vulnerabilities.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.1% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 12, 2026

Insecure embedded library in UnQLite 0.06 Perl module.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 9.8

Vulnerable embedded UnQLite library.

RemediationAI

Update.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Outdated embedded library with known vulnerabilities.

Know when Unqlite gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

UnQLite versions through 0.06 for Perl uses a potentially insecure version of the UnQLite library.

UnQLite for Perl embeds the UnQLite library. Version 0.06 and earlier of the Perl module uses a version of the library from 2014 that may be vulnerable to a heap-based overflow.

Executive ViewAI

Why It Matters

UnQLite Perl library versions through 0.06 contain a critical vulnerability (CVSS 9.8) that could allow attackers to compromise systems using this embedded database library. Any organization running applications dependent on UnQLite for Perl faces immediate risk of data breach, system compromise, or service disruption until remediation is completed.

Business Impact: Severe

Compensating Controls

Implement network segmentation to restrict access to systems using UnQLite; disable UnQLite functionality if not operationally required; deploy WAF rules to detect exploitation patterns targeting UnQLite; enable comprehensive logging and SIEM alerting for abnormal database activity; consider immediate migration to alternative, patched database libraries; restrict application permissions to least-privilege principles.

Threat Intelligence Overview

EPSS Score

0.1%

Top 84% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.