# CVE-2026-81886: radare2 unbounded allocation in dmp64 parser

Source: https://junglewise.ai/threats/cve-2026-81886-radare2-is-a-unix-like-reverse-engineering-framework-and-command  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-22. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-81886 · Severity: medium · CVSS 5.5 · Published 2026-09-22

radare2 is a reverse engineering framework used to analyze binary files and crash dumps. A flaw in its Windows 64-bit crash dump parser allows an attacker to craft a malicious dump file that triggers uncontrolled memory allocation when opened, causing the tool to hang or crash—denying analysts access to the system for forensic investigation.

Technologies: [Radareorg Radare2](https://junglewise.ai/threats/technologies/radareorg-radare2). Vendors: [Radareorg](https://junglewise.ai/threats/vendors/radareorg).

## Quick answers

**Is CVE-2026-81886 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-81886 being exploited in the wild.

**How severe is CVE-2026-81886?** Medium severity, with a CVSS score of 5.5, published 22 September 2026.

**Which products and versions are affected?** Radareorg Radare2 before 6.2.0.

**Is there a fix for CVE-2026-81886?** A patch was published on 2026-07-06: commit a7519fdb4da6835c2cecd8fe248e7dd1133cf17a Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-81886 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-81886?** Check whether you run Radareorg Radare2 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The dmp64 parser in radare2 prior to 6.2.0 reads a page count directly from an untrusted crash dump file and uses it as a loop bound for heap allocation without validating it against the dump file size. An attacker can craft a DMP file with the magic "PAGEDU64", DumpType=1, and a PageCount field set to 0xFFFFFFFFFFFFFFFF to trigger unbounded allocation. The vulnerability is reached on file open and requires no user interaction beyond opening the malicious file.

## Affected products

- radareorg radare2 before 6.2.0

## Timeline

- 2026-07-12: disclosed
- 2026-07-06: patched: commit a7519fdb4da6835c2cecd8fe248e7dd1133cf17a
- 2026-09-22: advisory

## References

- [https://github.com/radareorg/radare2/commit/a7519fdb4da6835c2cecd8fe248e7dd1133cf17a](https://github.com/radareorg/radare2/commit/a7519fdb4da6835c2cecd8fe248e7dd1133cf17a)
- [https://github.com/radareorg/radare2/issues/26224](https://github.com/radareorg/radare2/issues/26224)

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- [radare2 sandbox policy enforcement bypass in HTTP handler](https://junglewise.ai/threats/cve-2026-112077-a-vulnerability-was-detected-in-radareorg-radare2-6-2-0-6-2-2)
- [radare2 heap out-of-bounds read in ELF PN_XNUM handling](https://junglewise.ai/threats/cve-2026-81879-radare2-is-a-unix-like-reverse-engineering-framework-and-command)