CVE-2026-9538
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product\
PublishedMay 26, 2026
First seenMay 26, 2026
Weakness typeCWE-789CWE-789
How to fix
Update
- archive\ \3.10 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| archive\ \ | tar_project ≤ v < 3.10 | 3.10 |
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