[UPDATE] [medium] 7-Zip: Multiple vulnerabilities

CSIRTS triage

What

Multiple vulnerabilities allow a remote, anonymous attacker to disclose memory contents, trigger a denial-of-service, or execute arbitrary code.

Who is affected

Deployments of 7-Zip.

Urgency

Remediation is high urgency due to the severity and potential for exploitation.

Action

Update to the latest version of 7-Zip.

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

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

medium

Published

2026-08-17

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1736

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-2026-480920.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-481010.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-481020.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-481030.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 13% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-481040.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-481110.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 13% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-481120.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all EPSS-scored CVEs.

Referenced CVEs

Recent advisories for 7-Zip

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-2026-54616: NanaZip is the 7-Zip derivative intended for the modern Windows experience. From version 1.0.8…nvd · 2026-08-20
• medium[NEW] [medium] 7-Zip: Vulnerability allows code executioncert-bund · 2026-08-06
• low[UPDATE] [UNPATCHED] [low] 7-Zip: Vulnerability allows bypassing of security measurescert-bund · 2026-08-06
• highCVE-2026-14266: 7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vu…nvd · 2026-07-29
• high[UPDATE] [high] 7-Zip: Vulnerability allows code executioncert-bund · 2026-07-28
• unknownCVE-2026-55783: NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.…nvd · 2026-07-10

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