Buffer overflow in the gzprintf function in zlib 1.1.4, when zlib is compiled without vsnprintf or when long inputs are truncated using vsnprintf, allows attackers to cause a denial of service or possibly execute arbitrary code.
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Buffer overflow in the gzprintf function in zlib 1.1.4, when zlib is compiled without vsnprintf or when long inputs are truncated using vsnprintf, allows attackers to cause a denial of service or possibly execute arbitrary code.
March 7, 2003
April 16, 2026
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
Zlib 1.1.4 - Compression Library 'gzprintf()' Buffer Overrun (1)
Open source ↗Zlib 1.1.4 - Compression Library 'gzprintf()' Buffer Overrun (2)
Open source ↗See which npm, PyPI, Go, and Maven packages are affected by CVE-2003-0107
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