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CVE-2026-77640

torproject / Tor PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
torproject / Toraffected 0.2.6.1-alpha before 0.4.9.9

CWE

CWE-1284

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.