CVE-2023-30571

5.3 mediumEPSS 0.2%

Medium (5.3) in libarchive libarchive. EPSS 0.2% chance of exploitation in the next 30 days.

Libarchive through 3.6.2 can cause directories to have world-writable permissions. The umask() call inside archive_write_disk_posix.c changes the umask of the whole process for a very short period of time; a race condition with another thread can lead to a permanent umask 0 setting. Such a race condition could lead to implicit directory creation with permissions 0777 (without the sticky bit), which means that any low-privileged local user can delete and rename files inside those directories.

Severity

CVSS 3.1

5.3 medium

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-31)
CWE: CWE-362
Published: 2023-05-29
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

libarchive:libarchive

References

https://github.com/libarchive/libarchive/issues/1876
https://groups.google.com/g/libarchive-announce
https://github.com/libarchive/libarchive/issues/1876
https://groups.google.com/g/libarchive-announce

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