---
id: CVE-2026-123096
title: >-
  anacrolix/torrent through 1.61.0 Memory Exhaustion via Unbounded HTTP Tracker
  Response
summary: >-
  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 …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-770
vendor: anacrolix
product: torrent
affected:
  - torrent <= 1.61.0
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T15:11:50.578Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123096'
references:
  - url: 'https://github.com/anacrolix/torrent/pull/1143'
  - url: >-
      https://github.com/anacrolix/torrent/commit/92ad51490479bb8b94720f964b1c67e5a1d68faa
  - url: >-
      https://github.com/anacrolix/torrent/blob/v1.61.0/tracker/http/http.go#L114-L126
  - url: 'https://github.com/anacrolix/torrent'
  - url: >-
      https://www.vulncheck.com/advisories/anacrolix-torrent-through-1.61.0-memory-exhaustion-via-unbounded-http-tracker-response
    label: >-
      VulnCheck Advisory: anacrolix/torrent through 1.61.0 Memory Exhaustion via
      Unbounded HTTP Tracker Response
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.894Z'
epss: 0.00256
epssPercentile: 0.17245
---

## Overview

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.

## Affected

- `torrent <= 1.61.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.