[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: 2026-08-11
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.

Moderate exploitation riskCVE-2026-44241.2% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 67% of all EPSS-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 23% of all EPSS-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

Same CVEs, other sources

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

unknownNCSC-2026-0319 [1.00] [M/H] Vulnerabilities resolved in Apple iOS and iPadOSncsc-nl
unknownApple Products Multiple Vulnerabilitieshkcert
unknownMultiple vulnerabilities in Apple products (August 18, 2026)cert-fr-avis
high[UPDATE] [high] IBM QRadar SIEM: Multiple vulnerabilitiescert-bund
medium[NEW] [medium] Apple iOS and iPadOS: Multiple vulnerabilitiescert-bund
unknownNCSC-2026-0267 [1.00] [M/H] Vulnerabilities fixed in Apple MacOSncsc-nl
unknownNCSC-2026-0266 [1.00] [M/H] Vulnerabilities fixed in Apple iOS and iPadOSncsc-nl
high[NEW] [high] Oracle Communications: Multiple vulnerabilitiescert-bund
unknownApple Products Multiple Vulnerabilitieshkcert

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.

medium[NEW] [medium] libarchive: Vulnerability enables denial of servicecert-bund · 2026-08-24
mediumCVE-2026-63134: Malcolm is a network traffic analysis tool suite. Prior to version 26.07.0, `safe-extract.py` …nvd · 2026-08-11
medium[UPDATE] [medium] libarchive: Vulnerability allows code executioncert-bund · 2026-08-11
high[UPDATE] [high] libarchive: Vulnerability enables Denial of Service and potentially Code Executioncert-bund · 2026-08-11
lowCVE-2026-16517: Libarchive: libarchive: signed integer overflow in archive_write_zip_headermsrc · 2026-08-06
low[NEW] [low] libarchive: Vulnerability allows unspecified attackcert-bund · 2026-07-23