Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-81879

CVE-2026-81879MEDIUM

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  L  N  H    6.1   .0018    7.0     —

AFFECTED
  Product  Versions   Fixed
  radare2  < 6.2.0 –  —

TIMELINE
  Aug 27  Reserved by GitHub_M
  Sep 22  Published (CNA: GitHub_M)
  Sep 25  EXPLOIT PUBLISHED — CVE-2026-81879 (radareorg radare2). Public exploit reference added.
  Sep 25  RESCORED — CVE-2026-81879 (radareorg radare2). CVSS 5.5 → 6.1 (NVD).

CWE-125 · CNA: GitHub_M · CVSS v3.1 · 5 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
August 27, 2026	Reserved	Reserved by GitHub_M
September 22, 2026	Published	Published (CNA: GitHub_M)
September 25, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-81879 (radareorg radare2). Public exploit reference added.
September 25, 2026	RESCORED	RESCORED — CVE-2026-81879 (radareorg radare2). CVSS 5.5 → 6.1 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
radareorg	radare2	—	< 6.2.0	—

Weaknesses

CWE-125

References (5)

https://github.com/radareorg/radare2/commit/9449b07579c19b6b187c1a0918fbec2cef1a036e [Patch]
https://github.com/radareorg/radare2/issues/26223 [Exploit, Issue Tracking, Mitigation, Vendor Advisory]
https://github.com/radareorg/radare2/pull/26178 [Patch]
https://github.com/radareorg/radare2/releases/tag/6.2.0 [Release Notes]
https://github.com/radareorg/radare2/security/advisories/GHSA-jqfq-hvcp-xh4p [Patch, Vendor Advisory]

Authoritative record: CVE-2026-81879 at cve.org

Vendors: radareorg

Weaknesses: CWE-125

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-81879 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.