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CVE-2026-42497— Archive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory

Quick assessment

Affected
BINGOS Archive::Tar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pear Archive_Tar是PEAR团队的一个基于Php的可以对tar包进行创建、提取等操作的软件。 Pear Archive_Tar 3.08之前版本存在安全漏洞，该漏洞源于_make_special_file()函数将tar标头的linkname传递给link()时未验证绝对路径或..段，创建与受害者文件共享inode的硬链接，后续通过提取名称写入可修改受害者文件，且提取后的chmod、chown和utime块仅通过-l检查符号链接，导致在提取期间将tar标头的模式、所有者和时间戳应用于共享in

AI Predicted 7.5 Difficulty: Moderate EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1490 · Inhibit System Recovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
BINGOS Archive::Tar < 3.08 affected
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I. Basic Information for CVE-2026-42497

Vulnerability Information
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Vulnerability Title
Archive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory
Source: CVE Program / CVE List V5
Vulnerability Description
Archive::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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Pear Archive_Tar 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pear Archive_Tar是PEAR团队的一个基于Php的可以对tar包进行创建、提取等操作的软件。 Pear Archive_Tar 3.08之前版本存在安全漏洞，该漏洞源于_make_special_file()函数将tar标头的linkname传递给link()时未验证绝对路径或..段，创建与受害者文件共享inode的硬链接，后续通过提取名称写入可修改受害者文件，且提取后的chmod、chown和utime块仅通过-l检查符号链接，导致在提取期间将tar标头的模式、所有者和时间戳应用于共享in
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
BINGOS Archive::Tar 0 ~ 3.08 -

II. Public POCs for CVE-2026-42497

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III. Intelligence Information for CVE-2026-42497

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Patches & Fixes for CVE-2026-42497 (1)

Vendor Advisories for CVE-2026-42497 (1)

Other References for CVE-2026-42497 (1)

Same Patch Batch · BINGOS · 2026-05-26 · 3 CVEs total

CVE-2026-42496 Archive::Tar versions before 3.08 for Perl extract symlinks with attacker controlled targe
CVE-2026-9538 Archive::Tar versions before 3.10 for Perl allow memory exhaustion via attacker controlled

IV. Related Vulnerabilities

Same product: Archive::Tar
Same vendor: BINGOS
Same weakness: CWE-59

V. Comments for CVE-2026-42497

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