CVE-2026-42497Network attack vector

Arbitrary file modification via unvalidated hardlink targets

Published May 26, 2026 · Updated May 26, 2026

Improper link resolution in BINGOS Archive::Tar before 3.08 allows context-dependent attackers to modify files via crafted tar archives. Archive::Tar::_make_special_file passes each tar header's unvalidated linkname to link(), so an absolute path or .. segment creates an extracted hardlink to a victim inode outside the destination. Hardlink extraction is enabled by default before 3.06 and requires EXTRACT_HARDLINK in 3.06 and 3.07; extraction can overwrite victim contents or alter their mode, owner, and timestamps.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper link resolution in BINGOS Archive::Tar before 3.08 allows context-dependent attackers to modify files via crafted tar archives. Archive::Tar::_make_special_file passes each tar header's unvalidated linkname to link(), so an absolute path or .. segment creates an extracted hardlink to a victim inode outside the destination. Hardlink extraction is enabled by default before 3.06 and requires EXTRACT_HARDLINK in 3.06 and 3.07; extraction can overwrite victim contents or alter their mode, owner, and timestamps.

The record

CVE
CVE-2026-42497
Published
May 26, 2026
Updated
May 26, 2026
Vendor
BINGOS
Product
Archive::Tar
Classifications
CWE-732, CWE-59
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.08

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BINGOS · Archive::Tarversion=0 <3.08

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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