CVE-2026-81879

Description

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's ELF PN_XNUM handling was vulnerable because the ELF parser allocated the program-header array using the resolved PN_XNUM count but several consumers still iterated with the original e_phnum value of 65535. The vulnerability is triggered by processing a crafted ELF file with e_phnum = 0xffff and a much smaller resolved count in shdr[0].sh_info. Consumers iterated beyond the allocated program-header array. This can cause a heap out-of-bounds read and process termination, resulting in denial of service; memory disclosure and code execution have not been demonstrated. This issue is fixed in version 6.2.0.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: MEDIUM
CVSS score: 5.5 / 10
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Effective score: 5.5 / 10 MEDIUM source: CNA overview
CWE(s): CWE-125
Reserved: 2026-08-27
Published: 2026-09-22 15:09 UTC
Last updated: 2026-09-22 15:38 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/81xxx/CVE-2026-81879.json

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: 2026-09-22 16:18:02 UTC
NVD last modified: 2026-09-22 16:18:02 UTC
NVD CVSS v3.1: 5.5 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Exploitability subscore: 1.8 / 10
Impact subscore: 3.6 / 10

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-2026-84504
Assigner: GitHub_M
Published: Sep 22, 2026, 3:09:01 PM
Updated: Sep 22, 2026, 3:38:46 PM
EUVD base score (CVSS 3.1): 5.5 / 10
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EUVD-reported EPSS: 0.0000
Vendors: radareorg
Products: radare2 (< 6.2.0)

ENISA description: radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's ELF PN_XNUM handling was vulnerable because the ELF parser allocated the program-header array using the resolved PN_XNUM count but several consumers still iterated with the original e_phnum value of 65535. The vulnerability is triggered by processing a crafted ELF file with e_phnum = 0xffff and a much smaller resolved count in shdr[0].sh_info. Consumers iterated beyond the allocated program-header array. This can cause a heap out-of-bounds read and process termination, resulting in denial of service; memory disclosure and code execution have not been demonstrated. This issue is fixed in version 6.2.0.

EUVD references (5)

Affected products (1)

Vendor	Product	Versions	Platforms
radareorg	radare2	`< 6.2.0` (affected)	—

Vendor references (5)

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

https://github.com/radareorg/radare2/security/advisories/GHSA-jqfq-hvcp-xh4p x_refsource_CONFIRM
https://github.com/radareorg/radare2/issues/26223 x_refsource_MISC
https://github.com/radareorg/radare2/pull/26178 x_refsource_MISC
https://github.com/radareorg/radare2/commit/9449b07579c19b6b187c1a0918fbec2cef1a036e x_refsource_MISC
https://github.com/radareorg/radare2/releases/tag/6.2.0 x_refsource_MISC

Web references (0)

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

No web references attached yet.

NVD-tagged references (6)

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/radareorg/radare2/commit/9449b07579c19b6b187c1a0918fbec2cef1a036e security-advisories@github.com
https://github.com/radareorg/radare2/issues/26223 security-advisories@github.com
https://github.com/radareorg/radare2/issues/26223 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://github.com/radareorg/radare2/pull/26178 security-advisories@github.com
https://github.com/radareorg/radare2/releases/tag/6.2.0 security-advisories@github.com
https://github.com/radareorg/radare2/security/advisories/GHSA-jqfq-hvcp-xh4p security-advisories@github.com

Remediations (10)

CVE-2026-81879 - Vulnerability Details - OpenCVE

web:app.opencve.io

Description radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's ELF PN_XNUM handling was vulnerable because the ELF parser allocated the program-header array using the resolved PN_XNUM count but several consumers still iterated with the original e_phnum value of 65535. The vulnerability is triggered by processing a crafted ELF file with e ...

2026-09-23 15:43 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-23 15:43 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-09-23 15:43 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:43 UTC
March 13, 2026—Hotpatch KB5084597 (OS Builds 26200.7982 and 26100.7982 ...

web:support.microsoft.com

This update for Windows 11, version 25H2 and 24H2 (KB5084597) incudes security improvements. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates. To view the ...

2026-09-23 15:43 UTC
August 2026 CVE Advisory Notification - Security

web:support.servicenow.com

Due to additional analysis provided by the security researcher who discovered CVE - 2026 -6876, we have upgraded the severity rating of CVE - 2026 -6876 from High to Critical. This change affects only the severity

2026-09-23 15:43 UTC
CVE-2026-81879 - vulnerability database | Vulners.com

web:vulners.com

CVE-2026-81879 🗓️ 22 Sep 2026 08:09:01 Reported by GitHub_M Type cve 🔗 web.nvd.nist.gov 👁 6 Views

2026-09-23 15:43 UTC
DSA-2026-359: Security Update for Dell OpenManage Enterprise ...

web:www.dell.com

Dell OpenManage Enterprise remediation is available for multiple security vulnerabilities that may be exploited by malicious users to compromise the affected system.

2026-09-23 15:43 UTC
CVE-2026-81879: radareorg radare2: radare2 is a UNIX-like ... - Rapid7

web:www.rapid7.com

CVE-2026-81879 : radareorg radare2: radare2 is a UNIX-like reverse engineering framework and command-line toolset. View severity, references, and remediation details from Rapid7.

2026-09-23 15:43 UTC
Patch Tuesday September 2026: Security Updates & CVE Analysis

web:zecurit.com

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

2026-09-23 15:43 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-81879.json.

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