---
id: CVE-2026-75625
title: >-
  Kraken agents fail to verify peer-to-peer downloaded blobs against their
  requested SHA-256 digest before committing to the content-addressable cache,
  relying only on CRC32 checksums for piece validation
summary: >-
  Kraken agents fail to verify peer-to-peer downloaded blobs against their
  requested SHA-256 digest before committing to the content-addressable cache,
  relying only on CRC32 checksums for piece validation. Attackers on the
  agent-to-agent p…
severity: critical
cvss: 9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-354
vendor: uber
product: kraken
affected:
  - kraken <= 0.1.27
published: '2026-08-18'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:06:30.133'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75625'
references:
  - url: 'https://github.com/uber/kraken'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/uber/kraken/blob/master/lib/torrent/storage/agentstorage/torrent.go
    label: disclosure@vulncheck.com
  - url: 'https://github.com/uber/kraken/issues/638'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/kraken-agents-peer-to-peer-download-cache-poisoning-via-digest-verification-bypass
    label: disclosure@vulncheck.com
  - url: 'https://github.com/uber/kraken/issues/638'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00241
epssPercentile: 0.13642
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-18T19:06:07.620370Z'
ingestedAt: '2026-09-24T15:45:56.701Z'
---

## Overview

Kraken agents fail to verify peer-to-peer downloaded blobs against their requested SHA-256 digest before committing to the content-addressable cache, relying only on CRC32 checksums for piece validation. Attackers on the agent-to-agent path or malicious peers can supply substituted content with forged CRC32 corrections that passes per-piece checks, poisoning the cache with attacker-chosen container image layers or manifests that are re-seeded and executed by other hosts.

## Remediation

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