radare2: Heap out-of-bounds read in radare2 ELF PN_XNUM handling

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-81879
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-22 16:18:02 UTC
Updated2026-09-22 16:18:02 UTC
Descriptionradare2 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Radareorg Radare2 affected < 6.2.0 Not specified

References

ReferenceSourceLinkTags
github.com/radareorg/radare2/security/advisories/GHSA-jqfq-hvcp-xh4p [email protected] github.com
github.com/radareorg/radare2/commit/9449b07579c19b6b187c1a0918fbec2cef1a... [email protected] github.com
github.com/radareorg/radare2/issues/26223 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/radareorg/radare2/releases/tag/6.2.0 [email protected] github.com
github.com/radareorg/radare2/pull/26178 [email protected] github.com
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