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-2026-81883

CVE-2026-81883LOW

radareorg radare2 — radare2: Out-of-bounds Read at the end of string in the LUA 5.3 bytecode

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  N  N  L    3.3   .0016    4.2     —

AFFECTED
  Product  Versions   Fixed
  radare2  < 6.2.0 –  —

TIMELINE
  Aug 27  Reserved by GitHub_M
  Sep 22  Published (CNA: GitHub_M)
  Sep 28  EXPLOIT PUBLISHED — CVE-2026-81883 (radareorg radare2). Public exploit reference added.

CWE-125 · 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 Lua 5.3 bytecode function parser was vulnerable because the Lua 5.3 bytecode function parser read fixed function-metadata fields immediately after a function-name string without checking the remaining buffer length. The vulnerability is triggered by opening or inspecting a crafted Lua 5.3 bytecode file whose function-name string ends at the input-buffer boundary. The parser read two integers and three one-byte fields beyond the allocated input buffer. This can cause invalid parser results or process termination; no attacker-observable memory disclosure has been demonstrated. This issue is fixed in version 6.2.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 27, 2026	Reserved	Reserved by GitHub_M
September 22, 2026	Published	Published (CNA: GitHub_M)
September 28, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-81883 (radareorg radare2). Public exploit reference added.

Affected

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

Weaknesses

CWE-125

References (4)

https://github.com/radareorg/radare2/commit/26c2eac360033458e9d266e5e30667d1f8d642e3 [Patch]
https://github.com/radareorg/radare2/issues/26228 [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-96m5-hvwp-674c [Patch, Vendor Advisory]

Authoritative record: CVE-2026-81883 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-2026-81883 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.