CVE-2026-66485: Uncontrolled Memory Allocation in GNU cpio

unknownCVE-2026-66485

CSIRTS triage

vendor: GNU product: cpio Denial of service

What: GNU cpio allows uncontrolled memory allocation when processing malformed archives.
Who is affected: Systems running GNU cpio for archive extraction and compression operations.
Urgency: Unknown severity; patch availability and exploitation status unclear; verify impact in your environment.
Action: Check for available GNU cpio updates and apply when severity assessment is confirmed.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66485

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-2026-664850.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-66485	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 Uncontrolled Memory Allocation

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.

highCVE-2026-75935: Uncontrolled memory allocation in the binary Ion stream cursor in Amazon ion-java before 1.12.…nvd · 2026-08-18
highCVE-2026-74788: Scriban before 7.0.0 (affected versions <= 6.6.0) contains an uncontrolled memory allocation v…nvd · 2026-08-16
unknownCVE-2026-66485: GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/m…nvd · 2026-08-10
highGHSA-h669-8m4g-r2hc: MCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in St…ghsa · 2026-07-30
highCVE-2026-65315: Ollama (HEAD f0078ae) contains an uncontrolled memory allocation vulnerability in the GGUF met…nvd · 2026-07-21
highGHSA-v66j-x4hw-fv9g: Scriban: Uncontrolled Memory Allocation via string.pad_left/pad_right Allows Remote Denia…ghsa · 2026-03-24