Vulnerability · Published Aug 18, 2026 · Assigned by VulnCheck

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

Critical 9.0

In plain English

A critical-severity security flaw in kraken from uber. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)9.0Critical

Exploit odds (30 days)0.2%top 84.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:22.04:LTS	kraken	no fix listed	UBUNTU-CVE-2026-75625
Ubuntu:24.04:LTS	kraken	no fix listed	UBUNTU-CVE-2026-75625
Ubuntu:26.04:LTS	kraken	no fix listed	UBUNTU-CVE-2026-75625
Ubuntu:26.10	kraken	no fix listed	UBUNTU-CVE-2026-75625

Affected products (as reported)

Vendor	Product	Versions
uber	kraken	0 – through 0.1.27

Weakness: CWE-354 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References

GitHub Issue #638 issue-tracking
https://github.com/uber/kraken product
writePiece/WritePiece in lib/torrent/storage/agentstorage/torrent.go technical-description
VulnCheck Advisory: Kraken Agents Peer-to-Peer Download Cache Poisoning via Digest Verification Bypass third-party-advisory