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CVE-2026-77640

5.3 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.3 · torprojectNVD modified 2026-10-18 20:10

Affected (CPE criteria) 1

  • cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*

References 1