DEBIAN-CVE-2026-77640

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Source
https://security-tracker.debian.org/tracker/CVE-2026-77640
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77640.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-77640
Upstream
Published
2026-08-20T21:17:11Z
Modified
2026-09-09T09:00:51Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / tor

Package

Name
tor
Purl
pkg:deb/debian/tor?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.4.9.9-1

Affected versions

0.*
0.4.7.13-1
0.4.7.16-1
0.4.8.4-2
0.4.8.5-1
0.4.8.6-1
0.4.8.7-1
0.4.8.8-1
0.4.8.9-1~bpo11+1
0.4.8.9-1~bpo12+1
0.4.8.9-1
0.4.8.10-1~bpo11+1
0.4.8.10-1~bpo12+1
0.4.8.10-1
0.4.8.11-1~bpo11+1
0.4.8.11-1~bpo12+1
0.4.8.11-1
0.4.8.12-1~bpo11+1
0.4.8.12-1~bpo12+1
0.4.8.12-1
0.4.8.12-1.1
0.4.8.13-1
0.4.8.13-2~bpo12+1
0.4.8.13-2
0.4.8.14-1~bpo12+1
0.4.8.14-1
0.4.8.16-1
0.4.8.21-1~bpo12+1
0.4.8.21-1~bpo13+1
0.4.8.21-1~bpo13+2
0.4.8.21-1
0.4.8.22-1~bpo12+1
0.4.8.22-1~bpo13+1
0.4.8.22-1
0.4.9.5-1
0.4.9.5-2~bpo12+1
0.4.9.5-2~bpo13+1
0.4.9.5-2
0.4.9.6-0+deb12u1
0.4.9.6-1~bpo12+1
0.4.9.6-1~bpo13+1
0.4.9.6-1
0.4.9.8-0+deb12u1
0.4.9.8-1~bpo12+1
0.4.9.8-1~bpo13+1
0.4.9.8-1
0.4.9.9-1~bpo13+1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77640.json"

Debian:13 / tor

Package

Name
tor
Purl
pkg:deb/debian/tor?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.4.9.11-0+deb13u1

Affected versions

0.*
0.4.8.16-1
0.4.8.21-1~bpo12+1
0.4.8.21-1~bpo13+1
0.4.8.21-1~bpo13+2
0.4.8.21-1
0.4.8.22-1~bpo12+1
0.4.8.22-1~bpo13+1
0.4.8.22-1
0.4.9.5-1
0.4.9.5-2~bpo12+1
0.4.9.5-2~bpo13+1
0.4.9.5-2
0.4.9.6-0+deb13u1
0.4.9.6-1~bpo12+1
0.4.9.6-1~bpo13+1
0.4.9.6-1
0.4.9.8-0+deb13u1
0.4.9.8-1~bpo12+1
0.4.9.8-1~bpo13+1
0.4.9.8-1
0.4.9.9-1~bpo13+1
0.4.9.9-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77640.json"

Debian:14 / tor

Package

Name
tor
Purl
pkg:deb/debian/tor?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.4.9.9-1

Affected versions

0.*
0.4.8.16-1
0.4.8.21-1~bpo12+1
0.4.8.21-1~bpo13+1
0.4.8.21-1~bpo13+2
0.4.8.21-1
0.4.8.22-1~bpo12+1
0.4.8.22-1~bpo13+1
0.4.8.22-1
0.4.9.5-1
0.4.9.5-2~bpo12+1
0.4.9.5-2~bpo13+1
0.4.9.5-2
0.4.9.6-1~bpo12+1
0.4.9.6-1~bpo13+1
0.4.9.6-1
0.4.9.8-1~bpo12+1
0.4.9.8-1~bpo13+1
0.4.9.8-1
0.4.9.9-1~bpo13+1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77640.json"