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Vulnerability record · CVE-2022-26612 · published 7 April 2022

CVE-2022-26612: Apache hadoop link following vulnerability

Apache · Hadoop

In Apache Hadoop, The unTar function uses unTarUsingJava function on Windows and the built-in tar utility on Unix and other OSes. As a result, a TAR entry may create a symlink under the expected extraction directory which points to an external directory. A subsequent TAR entry may extract an arbitrary file into the external directory using the symlink name. This however would be caught by the same targetDirPath check on Unix because of the getCanonicalPath call. However on Windows, getCanonicalPath doesn't resolve symbolic links, which bypasses the check. unpackEntries during TAR extraction follows symbolic links which allows writing outside expected base directory on Windows. This was addressed in Apache Hadoop 3.2.3

9.8 CVSS 3.1 Critical EPSS 4.2% · top 9.3% CWE-59 · Link following
9.8CVSS 3.1 base score, v2 7.5
4.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In Apache Hadoop, The unTar function uses unTarUsingJava function on Windows and the built-in tar utility on Unix and other OSes. As a result, a TAR entry may create a symlink under the expected extraction directory which points to an external directory. A subsequent TAR entry may extract an arbitrary file into the external directory using the symlink name. This however would be caught by the same targetDirPath check on Unix because of the getCanonicalPath call. However on Windows, getCanonicalPath doesn't resolve symbolic links, which bypasses the check. unpackEntries during TAR extraction follows symbolic links which allows writing outside expected base directory on Windows. This was addressed in Apache Hadoop 3.2.3

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/hslo7wzw2449gv1jyjk8g6ttd7935fyz ExploitVendor Advisory
https://security.netapp.com/advisory/ntap-20220519-0004/ Third Party Advisory
https://lists.apache.org/thread/hslo7wzw2449gv1jyjk8g6ttd7935fyz ExploitVendor Advisory
https://security.netapp.com/advisory/ntap-20220519-0004/ Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2022-26612), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.