What is the CVSS score of CVE-2026-43861?

CVE-2026-43861 has a CVSS 3.1 base score of 3.7 (Low). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.0%.

Is there a patch available for CVE-2026-43861?

Yes, a patch is available for CVE-2026-43861. Update the affected software to the latest version immediately.

Mutt CVE-2026-43861

EUVD-2026-26899 LOW

Improper Neutralization of Null Byte or NUL Character (CWE-158)

2026-05-04 mitre

Information Disclosure Mutt

3.7

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness

CWE

CWE-158

OWASP Top 10:2025

A05:2025 - Injection

ASVS 5.0

V1 - Encoding and Sanitization Metacharacter neutralization

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – May 04, 2026

mutt before version 2.3.2 fails to validate null bytes during URL percent-decoding, allowing remote attackers to inject embedded null characters into decoded URLs, potentially causing information disclosure through truncation of validation checks or bypassing of security filters that rely on string length.

Affected VersionsENISA

mutt 0 <2.3.2

Affected Packages

euvd mutt fix: 2.3.2

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 3.7 LOW

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

Patch available

May 04, 2026 - 07:31 EUVD

Patch released

May 04, 2026 - 07:16 nvd

Patch available

CVE Published

May 04, 2026 - 05:52 nvd

LOW 3.7

DescriptionCVE.org

mutt before 2.3.2 does not check for '\0' in url_pct_decode.

Threat Intelligence Overview

EPSS Score

0.0%

Top 92% exploitable

Data Quality

7 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment

GitHub

VulDB

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 LOW

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

LOW severity (CVSS 0.1-3.9)

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.

SSVC AssessmentENISA

SSVC Decision· derived

Defer

Exploitation

None

System Exposure· derived

Open

Automatable

Human Impact· derived

Low

Technical Impact

Partial

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +18

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.