What is the CVSS score of CVE-2026-16634?

CVE-2026-16634 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: 0.2%.

Is there a patch available for CVE-2026-16634?

Yes, a patch is available for CVE-2026-16634. Update the affected software to the latest version immediately.

CVE-2026-16634

EUVD-2026-48547 CRITICAL

Use of Unmaintained Third Party Components (CWE-1104)

2026-07-24 9b29abf9-4ab0-4765-b253-1875cd9b441e

GHSA-hr7v-gv37-xpx2

Buffer Overflow

9.8

CVSS 3.1 · Vendor: 9b29abf9-4ab0-4765-b253-1875cd9b441e

View

Vulnerability Assessment

Weakness

CWE

CWE-1104

OWASP Top 10:2025

A03:2025 - Software Supply Chain Failures

ASVS 5.0

V15 - Secure Coding and Architecture Dependency maintenance

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

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 28, 2026

Stack overflow vulnerability in Perl module TOML::XS versions prior to 0.06 stems from an uncontrolled recursion flaw in the bundled, unmaintained tomlc99 library. An unauthenticated remote attacker can cause denial of service or potentially achieve arbitrary code execution by sending a deeply nested TOML document to any application using from_toml to parse untrusted input. No active exploitation or public exploit code has been identified, but the flaw is easily reachable over the network.

Affected VersionsENISA

TOML::XS 0 <0.06

Affected Packages

euvd toml_xs fix: 0.06

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

Vendor (9b29abf9-4ab0-4765-b253-1875cd9b441e) PRIMARY 9.8 CRITICAL

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

Primary rating from Vendor (9b29abf9-4ab0-4765-b253-1875cd9b441e) · only source for this CVE.

CVSS VectorVendor: 9b29abf9-4ab0-4765-b253-1875cd9b441e

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVSS changed

Jul 27, 2026 - 18:22 NVD

9.8 (CRITICAL)

Patch available

Jul 24, 2026 - 11:02 EUVD

CVE Published

Jul 24, 2026 - 10:16 cve.org

UNKNOWN (no severity yet)

CVE Published

Jul 24, 2026 - 10:16 cve.org

CRITICAL 9.8

DescriptionCVE.org

TOML::XS versions before 0.06 for Perl bundle an unsupported and vulnerable version of tomlc99.

The tomlc99 library is no longer maintained, and has an uncontrolled recursion vulnerability publicly reported in the issue tracker.

Any caller that passes untrusted TOML to from_toml risks a stack overflow from a deeply-nested document.

TOML::XS version 0.06 or later uses the successor tomlc17 library.

Threat Intelligence Overview

EPSS Score

0.2%

Top 86% exploitable

Social Media

Sightings

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment CIRCL

GitHub

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 0.2%

Patch available Yes

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.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

Yes

Human Impact· derived

Medium

Technical Impact

Total

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.