23 Oct 2026 15:48:27 UTC
radare2: Heap out-of-bounds read in radare2 ELF PN_XNUM handling
cve-program · CVE-2026-81879 · Published
CVE-2026-81879
radare2: Heap out-of-bounds read in radare2 ELF PN_XNUM handling
CVSS 3.1 5.5 MEDIUMCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-81879
Publishedradare2 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.
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