Vulnerability Countermeasure Information Database JVN iPedia Registration Status [2026 1st Quarter (Jan. - Mar.)]

1. 2026 1st Quarter: Vulnerability Countermeasure Information Database JVN iPedia Registration Status

The vulnerability countermeasure information database JVN iPedia is endeavoring to become a comprehensive vulnerability database where vulnerability information is aggregated for easy access for IT users. JVN iPedia collects and/or translates the vulnerability information published by 1) domestic software developers, 2) JVN (footnote 1), a vulnerability information portal run by JPCERT/CC and IPA, and 3) NVD (footnote 2), a vulnerability database run by NIST (footnote 3). JVN iPedia has been making vulnerability information available to the public since April 25, 2007.

1-1. Vulnerabilities Registered in the 1st Quarter of 2026

JVN iPedia now stores 277,036 vulnerabilities

The summary of the vulnerability information registered to the Japanese version of JVN iPedia during the first quarter (January 1 to March 31) of 2026 is shown in the table below. As of the end of March 2026, the total number of vulnerabilities stored in JVN iPedia is 277,036 (Table 1-1, Figure 1-1).

As for the JVN iPedia English version, the total number of vulnerabilities stored is 3,204 as shown in the Table 1-2.

Table 1-1. Vulnerabilities Registered in JVN iPedia in the 1st Quarter of 2026 (Japanese Version)

Table 1-2. Vulnerabilities Registered in JVN iPedia in the 1st Quarter of 2026 (English Version)

2. Details on JVN iPedia Registered Data

2-1. Types of Vulnerabilities Reported

Figure 2-1 shows the number of vulnerabilities newly added to JVN iPedia during the first quarter (January 1 to March 31) of 2026, sorted by the CWE vulnerability types.

The most frequently reported vulnerability type in the first quarter is CWE-79 (Cross-Site Scripting) with 1,163 cases, followed by CWE-74 (Injection) with 406 cases, CWE-22 (Path Traversal) with 402 cases, CWE-89 (SQL Injection) with 393 cases, and CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) with 337 cases. CWE-79 (Cross-Site Scripting), the most commonly reported vulnerability type in this quarter, could allow attackers to inject malicious content into webpages and/or steal information.

Software developers need to make sure to mitigate vulnerability from the planning and design phase of software development. IPA provides tools and guidelines, such as “Vulnerability Countermeasure Guide for Software Developers” (footnote 4), “How to Secure Your Web-site” (footnote 5), and “AppGoat” (footnote 6), a hands-on venerability learning tool, for website developers and operators to build secure websites.

2-2. Severity of Vulnerabilities Reported

Figure 2-2 shows the annual changes in vulnerabilities registered in JVN iPedia, categorized by severity level based on CVSS v2 scores.

Among the vulnerabilities registered in JVN iPedia in 2026, 42.7% are classified as Level 3 (7.0–10.0), 45.4% as Level 2 (4.0–6.9), and 11.9% as Level 1 (0.0–3.9). Overall, 88.1% are Level 2 or higher, indicating a high proportion of vulnerabilities that may lead to information exposure or data tampering. 

The significant decrease in the number of CVSSv2 registrations in JVN iPedia since 2024 is due to the fact that CVSSv2 is no longer actively assessed by NVD, the information source for JVN iPedia (footnote 7).

Figure 2-3 shows the annual changes in vulnerabilities registered in JVN iPedia, categorized by severity level based on CVSS v3 scores.

Among the vulnerabilities registered in JVN iPedia in 2026, 15.7% are classified as “Critical” (9.0–10.0), 40.6% as “High” (7.0–8.9), 41.7% as “Medium” (4.0–6.9), and 2.0% as “Low” (0.1–3.9).

To avoid the threats posed by the known vulnerabilities, both product developers and IT users should pay close attention to vulnerability disclosures and update the software they use to a fixed version or apply a security patch as soon as it becomes available. They can also check JVN iPedia for new vulnerabilities that are in RSS and XML formats (footnote 8).

2-3. Types of Software Reported with Vulnerability

Figure 2-4 shows the annual changes in the number of vulnerabilities registered in JVN iPedia, aggregated by software product type. Vulnerabilities related to applications account for the largest share in 2026, representing 71.9% (8,347 out of 11,605) of the total for that year.

Figure 2-5 shows the annual changes in the number of vulnerabilities in industrial control systems (ICS), including those used in critical infrastructure, as registered in JVN iPedia. As of March 2026, a total of 8,353 ICS vulnerabilities have been registered.

2-4. Products Reported with Vulnerability

Table 2-1 lists the top 20 software products with the highest number of vulnerabilities registered in JVN iPedia during the first quarter (January 1 to March 31) of 2026.

This quarter, Qualcomm components had the highest number of registered vulnerabilities, followed by the Linux kernel and Microsoft operating systems.

In addition to the products listed in the top 20 list, JVN iPedia provides a wide range of vulnerability information. Software developers and users are encouraged to utilize JVN iPedia to quickly obtain information on vulnerabilities affecting the software used in their organizations and take appropriate action promptly (footnote 9).

Table 2-1. Top 20 most registered software products vulnerability countermeasure information in JVN iPedia [Jan. – Mar. 2026]

3. Most Accessed Vulnerability Countermeasure Information

Table 3-1 lists the top 20 most frequently accessed Vulnerability Countermeasure Information entries in JVN iPedia during the first quarter (January 1 to March 31) of 2026.

This quarter, all of the top 20 were vulnerability countermeasure information published in Japan Vulnerability Notes (JVN), the vulnerability countermeasure information portal.

Table 3-1. Top 20 Most Accessed Vulnerability Countermeasure Information in JVN iPedia [Jan. – Mar. 2025]

Table 3-2 shows the top 5 most accessed Vulnerability Countermeasure Information entries reported by domestic software developers.

Table 3-2. Top 5 Most Accessed Vulnerabilities Reported by Domestic Product Developers [Jan. – Mar. 2025]

Footnotes

 (1) Japan Vulnerability Notes: A portal for vulnerability countermeasure information including information on vendor response to the reported vulnerabilities and security support. Operated in the collaboration of IPA and JPCERT/CC.

 (2) National Vulnerability Database: A vulnerability database operated by NIST.

 (3) National Institute of Standards and Technology: A U.S federal agency that develops and promotes measurement, standards and technology.

 (4) Vulnerability Countermeasure Guide for Software Developers (in Japanese only)

 (5) How to Secure Your Websites (latest version in Japanese only)

 (6) AppGoat (in Japanese only)

 (7) NIST - "Retirement of CVSS v2"

 (8) IPA Data Feeds (in Japanese only)

 (9) IPA Technical Watch - Daily Practice Guide (in Japanese only): Tips on Vulnerability Management The guide gives tips on how to efficiently collect and leverage vulnerability information.

Past Quarterly Reports

• Quarterly Reports of the JVN iPedia Registration Status