Archive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory

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Summary

CVECVE-2026-42497
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-26 02:16:40 UTC
Updated2026-05-28 14:16:20 UTC
DescriptionArchive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory. _make_special_file() passes the tar header's linkname to link() without validating it against absolute paths or .. segments, creating a hardlink that shares the victim file's inode. A subsequent write through the extracted name modifies the victim file, and the post-extraction chmod, chown, and utime block in _extract_file() (guarded only against symlinks via -l) applies the tar header's mode, owner, and timestamps to the shared inode during extraction alone.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.000180000 probability, percentile 0.048860000 (date 2026-05-27)

Problem Types: CWE-59 | CWE-732 | CWE-59 CWE-59 Improper Link Resolution Before File Access ('Link Following') | CWE-732 CWE-732 Incorrect Permission Assignment for Critical Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Archive tar_project archive\ \ tar

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA BINGOS ArchiveTar affected 3.08 custom Not specified

References

ReferenceSourceLinkTags
www.cve.org/CVERecord 9b29abf9-4ab0-4765-b253-1875cd9b441e www.cve.org Third Party Advisory
metacpan.org/release/BINGOS/Archive-Tar-3.08/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Release Notes
github.com/jib/archive-tar-new/commit/17c873492a05eddc0de18c1485e0b2cccd... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-04-12T00:00:00.000ZIssue reported.
CNA2026-05-10T00:00:00.000ZVersion 3.06 released, disabling hardlink extraction by default.
CNA2026-05-22T00:00:00.000ZVersion 3.08 released.

Solutions

CNA: Upgrade to Archive::Tar 3.08 or later.

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