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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.

PUBLISHED Reserved 2026-05-17 | Published 2026-05-18 | Updated 2026-05-18 | Assigner VulDB




MEDIUM: 4.6CVSS: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
MEDIUM: 4.2CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
MEDIUM: 4.2CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
4.0AV:L/AC:L/Au:M/C:P/I:P/A:P/E:POC/RL:OF/RC:C

Problem types

Symlink Following

Link Following

Product status

2.0
affected

2.1
affected

2.2
affected

Timeline

2026-05-17:Advisory disclosed
2026-05-17:VulDB entry created
2026-05-17:VulDB entry last update

Credits

nich0las (VulDB User) reporter

References

vuldb.com/vuln/364408 (VDB-364408 | npitre cramfs-tools cramfsck.c change_file_status symlink) vdb-entry technical-description

vuldb.com/vuln/364408/cti (VDB-364408 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/811897 (Submit #811897 | GNU cramfs-tools below v2.2 Symlink Following) third-party-advisory

github.com/npitre/cramfs-tools/issues/13 exploit issue-tracking

github.com/npitre/cramfs-tools/issues/13 issue-tracking

github.com/...ommit/b4a3a695c9873f824907bd15659f2a6ac7667b4f patch

github.com/npitre/cramfs-tools/ product

cve.org (CVE-2026-8784)

nvd.nist.gov (CVE-2026-8784)

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