CVE-2026-53655: node-tar applies PAX size override to intermediary GNU long-name/long-link headers, causing tar parser interpretation differential (file smuggling)
CSIRTS triage
- What
- Applies PAX size override to intermediary GNU long-name/long-link headers, causing tar parser interpretation differential (file smuggling).
- Who is affected
- Deployments of node-tar.
- Urgency
- Remediation is important due to the medium severity and potential for file manipulation.
- Action
- Update node-tar to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53655
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-2026-536550.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-53655 | coverage & exploitation status | NVD · CVE.org |
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