CVE-2026-77640
3.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| torproject | Tor | 0.2.6.1-alpha < 0.4.9.9 | affected |
Weaknesses
- CWE-1284: CWE-1284 Improper Validation of Specified Quantity in Input
References
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