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-2026-81881

CVE-2026-81881MEDIUM

radareorg radare2 — radare2: Heap out-of-bounds read in radare2 Mach-O Swift metadata parser

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  L  N  L    4.4   .0013    2.3     —

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-2026-81881 (radareorg radare2). Public exploit reference added.
  Sep 25  RESCORED — CVE-2026-81881 (radareorg radare2). CVSS 3.3 → 4.4 (NVD).

CWE-125, CWE-191 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

Description

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Mach-O Swift field-metadata parser was vulnerable because a relative Swift field pointer could be lower than the field-metadata section base, making subtraction produce a negative logical index. The vulnerability is triggered by parsing Swift type and class metadata from a crafted Mach-O file. The derived index was used to read four bytes immediately before the allocated field-metadata buffer. This can cause incorrect metadata processing or process termination; no attacker-observable memory disclosure has 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-2026-81881 (radareorg radare2). Public exploit reference added.
September 25, 2026	RESCORED	RESCORED — CVE-2026-81881 (radareorg radare2). CVSS 3.3 → 4.4 (NVD).

Affected

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

Weaknesses

CWE-125 · CWE-191

References (4)

https://github.com/radareorg/radare2/commit/1da6e782df220edf56138ef5fe4f33745b04db74 [Patch]
https://github.com/radareorg/radare2/issues/26229 [Exploit, Issue Tracking, Mitigation, Vendor Advisory]
https://github.com/radareorg/radare2/releases/tag/6.2.0 [Release Notes]
https://github.com/radareorg/radare2/security/advisories/GHSA-q4w7-225g-64j9 [Patch, Vendor Advisory]

Authoritative record: CVE-2026-81881 at cve.org

Vendors: radareorg

Weaknesses: CWE-125 · CWE-191

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-81881 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.