Vulnerability · Published May 18, 2026 · Assigned by VulDB

CVE-2026-8784npitre cramfs-tools cramfsck.c change_file_status symlink

Medium 4.2

In plain English

A medium-severity security flaw in cramfs-tools from npitre. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)4.2Medium

Exploit odds (30 days)0.2%top 95.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
npitre	cramfs-tools	2.02.12.2

Weakness: CWE-61, CWE-59 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

References

VDB-364408 | npitre cramfs-tools cramfsck.c change_file_status symlink vdb-entry, technical-description
VDB-364408 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #811897 | GNU cramfs-tools below v2.2 Symlink Following third-party-advisory
https://github.com/npitre/cramfs-tools/issues/13 exploit, issue-tracking
https://github.com/npitre/cramfs-tools/issues/13#issuecomment-4306102583 issue-tracking
https://github.com/npitre/cramfs-tools/commit/b4a3a695c9873f824907bd15659f2a6ac7667b4f patch
https://github.com/npitre/cramfs-tools/ product