PT-2026-60689 · Go · Github.Com/Envoyproxy/Ai-Gateway

CVE-2026-53717

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Published

2026-07-16

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Updated

2026-07-16

CVSS v3.1

6.5

Medium

VectorAV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability report without repro case. Repro case may be added later after harness is complete.
Preconditions (4):
  • Tenant can create EnvoyExtensionPolicy (baseline)
  • Controller has egress to attacker-controlled OCI registry
  • No registry allowlist (none exists in code)
  • Layer presents Docker/OCI media type
Description
At imagefetcher.go:287, make([]byte, h.Size) uses the attacker-controlled tar-header size; the LimitReader at :278 bounds bytes read from the stream but not the header-declared size returned by tr.Next() (a 512-byte header can claim a multi-TB entry via PAX/GNU encoding). Reached from untrusted tenant input via EnvoyExtensionPolicy spec.wasm[].code.image.url (envoyextensionpolicy.go:1157 → cache.go:262/299 → imagefetcher.go:218 → :287), and the allocation happens for every tar entry regardless of filename. The resulting Go runtime OOM throw is unrecoverable and, because the CRD persists, crash-loops the shared controller — single-request, non-volumetric, cluster-wide DoS.

Fix

Found an issue in the description? Have something to add? Feel free to write us 👾
dbugs@ptsecurity.com

Weakness Enumeration

CWE-789

Related Identifiers

CVE-2026-53717
GHSA-H7PQ-86H8-RP5X

Affected Products

Github.Com/Envoyproxy/Ai-Gateway