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CVE-2026-77640

nvd nist
Published: Aug 20, 2026Modified: Sep 8, 2026

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5.3
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Exploitability: 3.9 / Impact: 1.4
Source: NVD

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.

Affected (1)

Products: Torproject: Tor
Torproject
1 product
Tor
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Tor
Before 0.4.9.9

Related CWEs

CWE-1284
Improper Validation of Specified Quantity in Input
The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

References (1)

Source: cve@mitre.org
Permissions RequiredRelease NotesVendor Advisory

Timeline

No history available yet.