{"cve":"CVE-2023-6992","nvd":{"published":"2024-01-04T12:15:23.690","modified":"2026-06-17T06:51:49.910","status":"Modified","description":"Cloudflare version of zlib library was found to be vulnerable to memory corruption issues affecting the deflation algorithm implementation (deflate.c). The issues resulted from improper input validation and heap-based buffer overflow.\nA local attacker could exploit the problem during compression using a crafted malicious file potentially leading to denial of service of the software.\nPatches: The issue has been patched in commit  8352d10 https://github.com/cloudflare/zlib/commit/8352d108c05db1bdc5ac3bdf834dad641694c13c . The upstream repository is not affected.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-787","CWE-20","CWE-122","CWE-126"],"references":["https://github.com/cloudflare/zlib","https://github.com/cloudflare/zlib/security/advisories/GHSA-vww9-j87r-4cqh","https://github.com/cloudflare/zlib","https://github.com/cloudflare/zlib/security/advisories/GHSA-vww9-j87r-4cqh"],"products":["cloudflare:zlib"],"source":"nvd","synced_at":"2026-10-19T21:43:38.875533635+00:00"},"epss":{"cve":"CVE-2023-6992","score":0.00235,"percentile":0.14564,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}