[UPDATE] [medium] gzip: Multiple vulnerabilities

mediumCVE-2026-41991 CVE-2026-41992

A local attacker can exploit multiple vulnerabilities in gzip to manipulate files and disclose confidential information.

CSIRTS triage

vendor: gzip product: gzipOther

What: Multiple vulnerabilities allow a local attacker to manipulate files and disclose confidential information.
Who is affected: Local attackers exploiting vulnerabilities in gzip.
Urgency: Remediation is medium urgency due to the potential for information disclosure.
Action: Update to the latest version of gzip.

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: 2026-07-07
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-2026-2126

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-2026-419910.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.
Low exploitation riskCVE-2026-419920.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-41991	coverage & exploitation status	NVD · CVE.org
CVE-2026-41992	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 gzip

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-2026-59939: httplib2 is a comprehensive HTTP client library for Python. Prior to 0.32.0, httplib2 performs…nvd · 2026-07-08
unknownUSN-8512-1: Gzip vulnerabilitiesubuntu · 2026-07-06
highCVE-2026-41992: GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused…nvd · 2026-06-29
mediumCVE-2026-41991: GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file hand…nvd · 2026-06-29
unknownCVE-2026-41991: Predictable Temporary File in GNU gzipmsrc · 2026-06-09
unknownCVE-2026-41992: Global Buffer Overflow in GNU gzipmsrc · 2026-06-09