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Vulnerability record · CVE-2026-9538 · published 26 May 2026

CVE-2026-9538: Archive\ \ vulnerability

AArchive\ · \

Archive::Tar versions before 3.10 for Perl allow memory exhaustion via attacker controlled entry size field in tar header. _read_tar() reads each entry's payload with $handle->read($$data, $block), where $block is derived from the entry's 12-byte size field in the tar header with no upper bound on that value. A crafted header declaring a multi-gigabyte size causes Perl to allocate a scalar of that size.

7.5 CVSS 3.1 High EPSS 0.56% · top 55.6% CWE-789 · CWE-789
7.5CVSS 3.1 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
23 Jul 2026Last modified by NVD

Description

Archive::Tar versions before 3.10 for Perl allow memory exhaustion via attacker controlled entry size field in tar header. _read_tar() reads each entry's payload with $handle->read($$data, $block), where $block is derived from the entry's 12-byte size field in the tar header with no upper bound on that value. A crafted header declaring a multi-gigabyte size causes Perl to allocate a scalar of that size.

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

Affected products

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

References

LinkTags
https://github.com/jib/archive-tar-new/commit/f9af01426038e29d9578825a0cd3626946ab08c7.patch Patch
https://metacpan.org/release/BINGOS/Archive-Tar-3.10/changes Release Notes
http://www.openwall.com/lists/oss-security/2026/05/26/4 Mailing ListThird Party Advisory

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Related vulnerabilities

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

9.1CVE-2026-42496Archive\ \ link following vulnerabilityArchive::Tar versions before 3.08 for Perl extract symlinks with attacker controlled targets outside the extraction directory. _make_special_file() p…EPSS 0.51%7.5CVE-2026-42497Archive\ \ link following vulnerabilityArchive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory. _make_special_file() pass…EPSS 0.47%7.5CVE-2018-12015Canonical ubuntu linux link following vulnerabilityIn Perl through 5.26.2, the Archive::Tar module allows remote attackers to bypass a directory-traversal protection mechanism, and overwrite arbitrary…EPSS 7.3%6.8CVE-2007-4829Archive\ \ path traversal vulnerabilityDirectory traversal vulnerability in the Archive::Tar Perl module 1.36 and earlier allows user-assisted remote attackers to overwrite arbitrary files…EPSS 4.3%

Source: NIST National Vulnerability Database (record CVE-2026-9538), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.