NULL Pointer Dereference Affecting envoyproxy/envoy package, versions [1.8.0, 1.33.13)[1.34.0, 1.34.11)[1.35.0,]
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Proof of Concept
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- published4 Dec 2025
- disclosed3 Dec 2025
- creditbotengyao
Introduced: 3 Dec 2025
NewCVE-2025-64527 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to NULL Pointer Dereference in the JwksFetcherImpl. An attacker can cause a crash by sending requests with multiple JWT tokens, triggering a re-entry bug that leads to a null pointer dereference when the asynchronous HTTP response arrives.
Workaround
- Disable the
allow_missing_or_failedorallow_missing
Notes:
- This is only exploitable if
allow_missing_or_failedorallow_missingis enabled. - The fix for this vulnerability should also be included in v1.35.7 and v1.36.3; however, at the time of updating this advisory, those were not released yet.