What is CVE-2026-55392?

CVE-2026-55392 is a medium-severity vulnerability in Nilfs-dev Nilfs-utils, classified under Improper Validation of Specified Quantity in Input. CVSS score: 5.5/10. Published 2026-06-18.

How severe is CVE-2026-55392?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Nilfs-dev Nilfs-utils

CVE-2026-55392

NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfs_sb_is_valid() function fails to validate s_log_block_size field in NILFS2 superblock before bit-shift operations. Attackers supplying crafted NILFS2 images trigger undefined beh…

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Nilfs-dev Nilfs-utils — versions 0, 26efb5daff0757365101035145331b0a5a85d9d9

Weakness classification (CWE)

CWE-1284 — Improper Validation of Specified Quantity in Input

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)

Frequently asked questions

What is CVE-2026-55392?: CVE-2026-55392 is a medium-severity vulnerability in Nilfs-dev Nilfs-utils, classified under Improper Validation of Specified Quantity in Input. CVSS score: 5.5/10. Published 2026-06-18.
How severe is CVE-2026-55392?: Medium severity. CVSS v3 base score is 5.5 out of 10.