CVE-2026-9538

Summary

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.

Affected Software

Weaknesses

• CWE-789: CWE-789 Memory Allocation with Excessive Size Value

ADP Enrichment

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2026/05/26/4

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/jib/archive-tar-new/commit/f9af01426038e29d9578825a0cd3626946ab08c7.patch
• https://metacpan.org/release/BINGOS/Archive-Tar-3.10/changes

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