{"apiVersion":"1.0","identifier":"CVE-2026-77640","description":"tor before 0.4.9.9 was prone to an infinite loop when decompressing a truncated zlib/gzip stream with done=1. A truncated stream never reaches Z_STREAM_END, causing zlib to return Z_BUF_ERROR with no input remaining, which buf_add_compress() mistook for a full output buffer and retried forever. Fixed by returning TOR_COMPRESS_ERROR in that case so the caller can abort cleanly. This is TROVE-2026-021.","publishedAt":"2026-08-20T21:17:11","lastModifiedAt":"2026-08-21T21:17:08","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77640","cvssScore":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","epssProbability":0.00215,"riskScore":0.38,"affectedProduct":"Tor","affectedVersions":"<0.4.9.9","vulnerabilityType":"Critical software","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-77640","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-77640","en":"https://www.redsauce.net/en/cves/CVE-2026-77640","fr":"https://www.redsauce.net/fr/cves/CVE-2026-77640","pt":"https://www.redsauce.net/pt/cves/CVE-2026-77640","de":"https://www.redsauce.net/de/cves/CVE-2026-77640","sk":"https://www.redsauce.net/sk/cves/CVE-2026-77640","el":"https://www.redsauce.net/el/cves/CVE-2026-77640"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-77640"}}