[UPDATE] [medium] libarchive: Multiple vulnerabilities allow information disclosure and DoS

mediumCVE-2026-4424 CVE-2026-4426

A remote, anonymous attacker can exploit multiple vulnerabilities in libarchive to disclose information and to create a Denial-of-Service condition.

CSIRTS triage

vendor: libarchive product: libarchive Information disclosure Denial of service

What: A remote, anonymous attacker can exploit multiple vulnerabilities in libarchive to disclose information and to create a Denial-of-Service condition.
Who is affected: Deployments of libarchive are affected by these vulnerabilities.
Urgency: Remediation is urgent due to the potential for information disclosure and Denial-of-Service.
Action: Update libarchive to the latest version to address these vulnerabilities.

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

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-06
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-2026-0803

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-2026-44240.88% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all scored CVEs.
Low exploitation riskCVE-2026-44260.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-4424	coverage & exploitation status	NVD · CVE.org
CVE-2026-4426	coverage & exploitation status	NVD · CVE.org

Recent advisories for libarchive

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.

lowCVE-2026-15028: A flaw was found in libarchive. This vulnerability allows a remote attacker to trigger a heap …nvd · 2026-07-10
medium[UPDATE] [medium] libarchive: Vulnerability allows Denial of Servicecert-bund · 2026-07-06
medium[UPDATE] [medium] libarchive: Vulnerability allows code executioncert-bund · 2026-07-06
highCVE-2026-14164: A double free issue has been identified in libarchive's RAR5 reader. During parsing of a speci…nvd · 2026-06-30