What is the CVSS score of CVE-2026-1861?

CVE-2026-1861 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-1861?

Within 24 hours: Identify and inventory all Chrome deployments across the organization; communicate vulnerability alert to all users and restrict Chrome usage to business-critical functions only. Within 7 days: Implement browser isolation technology or restrict access to high-risk websites; deploy network-level controls to block malicious content delivery; monitor for active exploitation attempts. Within 30 days: Apply the vendor patch immediately upon release; conduct forensic analysis for signs of compromise; review and strengthen web filtering and endpoint detection capabilities.

Chrome CVE-2026-1861

HIGH

Heap-based Buffer Overflow (CWE-122)

2026-02-03 chrome-cve-admin@google.com

Buffer Overflow Chrome Google Suse

8.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Craft malicious HTML with VP8/VP9 video
Delivery

User visits webpage in Chrome
Exploit

Trigger heap buffer overflow in libvpx decoder
Execution

Corrupt heap memory
Impact

Execute arbitrary code

Vulnerability Assessment

Weakness	CWE CWE-122 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Heap buffer bounds checking MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	User interaction required: victim must open crafted HTML page in Chrome browser. libvpx video decoding enabled (default). No authentication or special Chrome configuration needed.
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: Required. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Heap buffer overflow in Chrome's libvpx video codec allows remote attackers to achieve arbitrary code execution through a malicious webpage, requiring only user interaction to trigger exploitation. The vulnerability affects Chrome versions prior to 144.0.7559.132 and currently lacks a patch. With a CVSS score of 8.8, this high-severity flaw poses significant risk to users who visit compromised or attacker-controlled websites.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 8.8

Heap buffer overflow in libvpx in Google Chrome prior to 144.0.7559.132 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High) [CVSS 8.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

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

Classified as CWE-122 (Heap-based Buffer Overflow). Affects Chrome. Heap buffer overflow in libvpx in Google Chrome prior to 144.0.7559.132 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

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

SUSE HIGH

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Apr 09, 2026 - 14:30 nvd

Patch available

CVE Published

Feb 03, 2026 - 21:16 nvd

HIGH 8.8

DescriptionCVE.org

Heap buffer overflow in libvpx in Google Chrome prior to 144.0.7559.132 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)

Executive ViewAI

Why It Matters

A critical heap buffer overflow vulnerability in Chrome's libvpx library (CVE-2026-1861) allows remote attackers to execute arbitrary code through malicious web pages, affecting all users running unpatched Chrome versions prior to 144.0.7559.132. With no patch currently available, organizations face immediate exploitation risk until a security update is released, making this a time-sensitive threat requiring urgent mitigation.

Business Impact: High

Compensating Controls

Deploy web application firewall (WAF) rules to detect and block crafted HTML payloads targeting libvpx; implement browser isolation solutions for high-risk web access; restrict Chrome to essential business use only; enforce network segmentation to limit lateral movement from compromised endpoints; enable Chrome sandbox hardening and restrict JavaScript execution where possible; monitor for suspicious process execution and memory corruption indicators via EDR tools; consider temporary deployment of alternative browsers for non-critical tasks.

Threat Intelligence Overview

EPSS Score

0.0%

Top 92% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS Vendor

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 HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

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.