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CVE-2026-59874

Isaacs Tar denial of service

7.5 HIGHPublic exploitEPSS 0.64%
  1. Published8 Jul 2026

Description

node-tar is a tar archive manipulation library for Node.js. Prior to 7.5.18, tar.replace accepts a checksum-valid tar header with a negative base-256 encoded entry size, causing the archive scanner to make no progress while repeatedly parsing the same header. This issue is fixed in version 7.5.18.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Isaacs Tar< 7.5.18

Remediation

Fixed in
Isaacs Tar≥ 7.5.18

References

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Frequently asked

Is CVE-2026-59874 being actively exploited?

CVE-2026-59874 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.64%.

How severe is CVE-2026-59874?

CVE-2026-59874 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.64% probability of exploitation.

Which products are affected by CVE-2026-59874?

Affected products include Isaacs Tar.

How do I fix CVE-2026-59874?

Upgrade affected software to a fixed version, for example Isaacs Tar 7.5.18 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-59874 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.