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CVE-2026-81878— radare2: Integer overflow causes heap out-of-bounds write in radare2 PYC parser

Quick assessment

Affected
radareorg radare2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overf

CVSS 5.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
radareorg radare2 < 6.2.0 affected
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I. Basic Information for CVE-2026-81878

Vulnerability Information

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Vulnerability Title
radare2: Integer overflow causes heap out-of-bounds write in radare2 PYC parser
Source: CVE Program / CVE List V5
Vulnerability Description
radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
radareorg radare2 < 6.2.0 -

II. Public POCs for CVE-2026-81878

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III. Intelligence Information for CVE-2026-81878

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Patches & Fixes for CVE-2026-81878 (2)

Other References for CVE-2026-81878 (3)

Same Patch Batch · radareorg · 2026-09-22 · 9 CVEs total

CVE-2026-81885 5.5 MEDIUM radare2: Infinite relocation-chain loop causes denial of service in radare2 NE parser
CVE-2026-81879 5.5 MEDIUM radare2: Heap out-of-bounds read in radare2 ELF PN_XNUM handling
CVE-2026-81880 5.5 MEDIUM radare2: Uncontrolled resource consumption in radare2 PEF loader
CVE-2026-81886 5.5 MEDIUM radare2: Uncontrolled memory allocation in radare2 dmp64 parser
CVE-2026-81882 3.3 LOW radare2: Missing string termination causes heap out-of-bounds read in radare2 bplist parse
CVE-2026-81881 3.3 LOW radare2: Heap out-of-bounds read in radare2 Mach-O Swift metadata parser
CVE-2026-81883 3.3 LOW radare2: Out-of-bounds Read at the end of string in the LUA 5.3 bytecode
CVE-2026-81884 2.5 LOW radare2: Heap out-of-bounds read in radare2 Mach-O LC_DATA_IN_CODE parser

IV. Related Vulnerabilities

Same product: radare2
Same vendor: radareorg
Same weakness: CWE-190

V. Comments for CVE-2026-81878

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