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CVE-2026-81878

5.5 · MEDIUM

radare2 is a UNIX-like reverse engineering framework and command-line toolset.

Published Sep 22, 2026radareCWE-190EPSS 0.20%

Overview

CVE-2026-81878 is a medium-severity vulnerability affecting radare radare2. It was published on September 22, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from radare. Update radare2 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
radareradare2>= 0, < 6.2.0Affected

References

GitHubgithub.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0GitHubgithub.com/radareorg/radare2/issues/26222GitHubgithub.com/radareorg/radare2/pull/26177GitHubgithub.com/radareorg/radare2/releases/tag/6.2.0GitHubgithub.com/radareorg/radare2/security/advisories/GHSA-9phv-v2w8-56j3GitHubgithub.com/radareorg/radare2/issues/26222

How CyberStrike helps

Frequently asked questions

What is CVE-2026-81878?

CVE-2026-81878 is a medium-severity vulnerability affecting radare radare2. It was published on September 22, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-81878?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-81878?

Check the references section for vendor advisories and patches from radare. Update radare2 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-81878?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-81878 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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