PatchTheCVECVE-2026-81878: radare2 is a UNIX-like reverse engineering framework and command-line toolset
CVE-2026-81878 is a medium-severity flaw (CVSS 5.5) affecting radare2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 befo
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Last updated 2026-09-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-81878?
radare2: upgrade to 6.2.0. Exact commands for each OS are on this page.
Is CVE-2026-81878 being exploited?
CVE-2026-81878 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-81878 affect?
CVE-2026-81878 affects radare2. Severity is medium (CVSS 5.5). 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 rejecti
How urgent is CVE-2026-81878?
Priority 27/100. Public exploit reference
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