CVE-2026-81878
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In radare2 prior to 6.2.0, the 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, causing heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated.
Risk Assessment
Opening a crafted .pyc file can lead to heap memory corruption and application crash (denial of service), and potentially arbitrary code execution. The risk mainly affects analysts opening untrusted files.
Recommendation
Update radare2 to version 6.2.0 or later. Avoid opening untrusted .pyc files without prior validation.
Other vulnerabilities in radare2
See all- CVE-2026-8696High
Version 6.1.5 of radare2 contains a use-after-free vulnerability in the gdbr_pids_list() function, which can be exploited by remote attackers to cause a denial of service or potentially execute arbitrary code by sending malformed thread information responses.
- CVE-2026-8695High
radare2 version 6.1.5 contains a use-after-free vulnerability in the gdbr_threads_list() function. This allows remote attackers to trigger memory corruption by sending a valid qfThreadInfo response followed by a malformed qsThreadInfo response.
- CVE-2026-40499High
radare2 prior to version 6.1.4 contains a command injection vulnerability in the PDB parser's print_gvars() function that allows attackers to execute arbitrary commands by embedding a newline byte in the PE section header name field. Attackers can craft a malicious PDB file with specially crafted section names to inject r2 commands that are executed when the idp command processes the file.
- CVE-2017-15932High
In radare2 version 2.0.1, an integer exception (negative number leading to an invalid memory access) exists in store_versioninfo_gnu_verdef() in elf.c, which can be triggered by crafted ELF files when parsing the ELF version on 32-bit systems.
- CVE-2017-15931High
In radare2 version 2.0.1, an integer exception (negative number leading to an invalid memory access) exists in store_versioninfo_gnu_verneed() in elf.c, which can be exploited via crafted ELF files on 32-bit systems.
- CVE-2017-15385High
The store_versioninfo_gnu_verdef function in radare2 2.0.0 allows remote attackers to cause a denial of service via a crafted ELF file, leading to an invalid write in r_read_le16 and application crash.
- CVE-2017-15368High
The wasm_dis function in radare2 version 2.0.0 allows remote attackers to cause denial of service through stack-based buffer over-read, leading to application crash. The attack can be executed using a crafted WASM file that triggers an incorrect r_hex_bin2str call.
- CVE-2017-10929High
The grub_memmove function in radare2 1.5.0 allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) via a crafted binary file.
- CVE-2017-9949High
The grub_memmove function in radare2 1.5.0 allows remote attackers to cause a denial of service via a crafted binary file, potentially leading to application crashes due to a buffer underflow.
- CVE-2017-6448High
The dalvik_disassemble function in radare2 version 1.2.1 allows remote attackers to cause a denial of service (stack-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted DEX file.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS