anacrolix/torrent through 1.61.0 contains a memory exhaustion vulnerability in the tracker/http package that allows malicious trackers to crash clients by returning unbounded responses. Attackers controlling an HTTP tracker in a torrent file or magnet link can return huge or gzip-compressed announce or scrape responses that Client.Announce and Client.Scrape buffer without limits, exhausting process memory.

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Fixes

Solution

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Workaround

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History

Fri, 06 Nov 2026 17:00:00 +0000

Type Values Removed Values Added
First Time appeared Anacrolix
Anacrolix torrent
Vendors & Products Anacrolix
Anacrolix torrent

Fri, 06 Nov 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 05 Nov 2026 15:30:00 +0000

Type Values Removed Values Added
Description anacrolix/torrent through 1.61.0 contains a memory exhaustion vulnerability in the tracker/http package that allows malicious trackers to crash clients by returning unbounded responses. Attackers controlling an HTTP tracker in a torrent file or magnet link can return huge or gzip-compressed announce or scrape responses that Client.Announce and Client.Scrape buffer without limits, exhausting process memory.
Title anacrolix/torrent through 1.61.0 Memory Exhaustion via Unbounded HTTP Tracker Response
First Time appeared Torrentflux Project
Torrentflux Project torrentflux
Weaknesses CWE-770
CPEs cpe:2.3:a:torrentflux_project:torrentflux:*:*:*:*:*:*:*:*
Vendors & Products Torrentflux Project
Torrentflux Project torrentflux
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-05T15:11:50.578Z

Reserved: 2026-11-05T12:22:13.477Z

Link: CVE-2026-123096

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-05T16:17:46.760

Modified: 2026-11-05T16:17:46.760

Link: CVE-2026-123096

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-11-05T15:11:50Z

Links: CVE-2026-123096 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-11-06T16:36:33Z

Weaknesses