CVE-2026-59874: node-tar: Negative tar entry size causes infinite loop in archive replace

highCVSS 7.5CVE-2026-59874

CSIRTS triage

vendor: node-tar product: node-tar Denial of service

What: An infinite loop can occur in archive replace due to a negative tar entry size.
Who is affected: Users of node-tar are affected.
Urgency: Remediation is high urgency due to the potential for denial of service.
Action: Update to the patched version of node-tar.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch node-tar

Get an email when a new node-tar advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.5
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59874

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-598740.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59874	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for node-tar

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] Red Hat Ansible Automation Platform (node-tar, linkify-it, protobufjs, brace-expansion, fast-uri,…cert-bund · 2026-07-31
mediumGHSA-r292-9mhp-454m: node-tar: Uncontrolled recursion in mapHas/filesFilter allows uncatchable stack-overflow …ghsa · 2026-07-24
mediumGHSA-w8wr-v893-vjvp: node-tar: Process crash via PAX numeric path type confusionghsa · 2026-07-20
criticalGHSA-23hp-3jrh-7fpw: node-tar: Decompression/parse DoS via unlimited inputghsa · 2026-07-20
highGHSA-8x88-c5mf-7j5w: node-tar: Negative tar entry size causes infinite loop in archive replaceghsa · 2026-07-20
mediumGHSA-gvwx-54wh-qm9j: node-tar: Uncaught Exception DoS via NUL byte in PAX path/linkpath recordsghsa · 2026-07-20