This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-77639 →

DEBIAN-CVE-2026-77639

Tor before 0.4.9.9 was prone to a compression bomb bypass where an attacker could concatenate many gzip or zlib sub-streams, each just under the per-s...

Original description

The description as published by the source.

Tor before 0.4.9.9 was prone to a compression bomb bypass where an attacker could concatenate many gzip or zlib sub-streams, each just under the per-stream detection threshold, to avoid the compression bomb check entirely. This is TROVE-2026-022.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 tor

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.9-1"}]}]

Debian:13 tor

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.11-0+deb13u1"}]}]

Debian:14 tor

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.9-1"}]}]

References

advisory security-tracker.debian.org