CVE-2026-7258

Description

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some functions, including urldecode(), pass signed char to ctype functions (like isxdigit()). On the systems with default signed char and optimized table-lookup ctype functions - such as NetBSD - this can lead to accessing array with negative offset, which can trigger a denial of service.

Overview

State: PUBLISHED
Assigner (CNA): php
CVSS severity: MEDIUM
CVSS score: 6.3 / 10
CVSS vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/U:Amber
Effective score: 6.3 / 10 MEDIUM source: CNA overview
CWE(s): CWE-125
Reserved: 2026-04-28
Published: 2026-05-10 06:28 UTC
Last updated: 2026-05-11 15:06 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/7xxx/CVE-2026-7258.json
Linked Threat: CVE-2026-7258 — CVE-2026-7258

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-10 05:16:11 UTC
NVD last modified: 2026-05-12 17:41:43 UTC
NVD CVSS v3.1: 7.5 / 10 HIGH source: nvd@nist.gov
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 3.6 / 10
EPSS score: 0.0002 (probability of exploitation in next 30 days)
EPSS percentile: 6.67% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-28968
Assigner: php
Published: May 10, 2026, 4:28:14 AM
Updated: May 11, 2026, 1:06:10 PM
EUVD base score (CVSS 4.0): 6.3 / 10
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/U:Amber
EUVD-reported EPSS: 0.0200
Vendors: PHP Group
Products: PHP (8.2.* <8.2.31)

PHP (8.3.* <8.3.31)

PHP (8.5.* <8.5.6)

PHP (8.4.* <8.4.21)

ENISA description: In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some functions, including urldecode(), pass signed char to ctype functions (like isxdigit()). On the systems with default signed char and optimized table-lookup ctype functions - such as NetBSD - this can lead to accessing array with negative offset, which can trigger a denial of service.

EUVD references (1)

https://github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-07-28 03:00 UTC (source: CVRF).

MS severity: Moderate
Release: 2026-May

Affected products (1)

Vendor	Product	Versions	Platforms
PHP Group	PHP	`8.2.` (affected), `8.3.` (affected), `8.4.` (affected), `8.5.` (affected)	NetBSD

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4 vendor-advisory

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4 vendor-advisory

Web references (8)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

MSRC update guide: CVE-2026-7258 msrc
https://attackerkb.com/topics/CVE-2026-7258 rapid7:attackerkb.com
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28968 rapid7:euvd.enisa.europa.eu
http://cwe.mitre.org/data/definitions/125.html rapid7:cwe.mitre.org
https://security.alpinelinux.org/vuln/CVE-2026-7258 rapid7:security.alpinelinux.org
https://nvd.nist.gov/vuln/detail/CVE-2026-7258 tenable:nvd.nist.gov
https://www.first.org/epss/ tenable:www.first.org
https://www.cve.org/CVERecord?id=CVE-2026-7258 tenable:www.cve.org

NVD-tagged references (1)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4 security@php.net Vendor Advisory

Remediations (14)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-7258 - Vulnerability Details - OpenCVE

web:app.opencve.io

Ensure application logic validates or sanitizes URL‑decoded input and avoids calling urldecode on untrusted data until a patch is applied Generated by OpenCVE AI on May 16, 2026 at 02:20 UTC.

2026-05-23 21:03 UTC
Nvd - Cve-2026-7258

web:nvd.nist.gov

An official website of the United States government NVD MENU

2026-05-23 21:03 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-23 21:03 UTC
CVE-2026-7258 - security-tracker.debian.org

web:security-tracker.debian.org

Vulnerable and fixed packages The table below lists information on source packages.

2026-05-23 21:03 UTC
Fortinet Releases Guidance to Address Ongoing Exploitation of ... - CISA

web:www.cisa.gov

Fortinet Releases Guidance to Address Ongoing Exploitation of Authentication Bypass Vulnerability CVE - 2026 -24858

2026-05-23 21:03 UTC
April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

2026-05-23 21:03 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-05-23 21:03 UTC
CVE-2026-7258 Common Vulnerabilities and Exposures | SUSE

web:www.suse.com

Secure your Linux systems from CVE-2026-7258 . Stay ahead of potential threats with the latest security updates from SUSE.

2026-05-23 21:03 UTC
CVE-2026-7258 | Tenable®

web:www.tenable.com

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some functions, including urldecode (), pass signed char to ctype functions (like isxdigit ()). On the systems with default signed char and optimized table-lookup ctype functions - such as NetBSD - this can lead to accessing array with negative offset, which can trigger a denial of service.

2026-05-23 21:03 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-23 21:03 UTC
Security Advisory Bulletin 064 | Ubiquiti Community

web:community.ui.com

Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...

2026-05-26 02:50 UTC
Nvd - Cve-2026-45585

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-05-26 02:50 UTC
Microsoft Patches 138 Vulnerabilities, Including DNS and Netlogon RCE Flaws

web:thehackernews.com

Microsoft patched 138 flaws, including 30 Critical bugs, as AI discovery expands Patch Tuesday risk.

2026-05-26 02:50 UTC
Microsoft Technical Security Notifications

web:www.microsoft.com

Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.

2026-05-26 02:50 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-7258.json.

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