Summary
Envoy Gateway: Wasm cache ServeHTTP reads mappingPath2Cache without lock
Vulnerability report without repro case. Repro case may be added later after harness is complete.
Preconditions (4):
- Pod-network reachability to :18002 (no auth)
- Tenant can create EnvoyExtensionPolicy (baseline)
- Attacker pod floods GET while churning EnvoyExtensionPolicy with distinct Wasm URLs
- Read at :153 must overlap a write at :201/:209 (probabilistic, attacker controls both rates)
Description:
httpserver.go:153 reads s.mappingPath2Cache with no lock while httpserver.go:201/209 write it under s.Lock(); the struct uses a plain map. Writer is tenant-reachable via EnvoyExtensionPolicy translation, reader is pod-network-reachable on :18002 with per-request goroutines. Go's concurrent map read+write detection calls runtime.throw, which net/http's per-conn recover cannot catch, so the controller process exits, cross-tenant control-plane DoS. Capped at MEDIUM: DoS-only, k8s restarts pod, timing-dependent trigger.
Impact
Multiple concurrent operations access a shared resource without proper synchronization, producing unpredictable results depending on timing. Typical impact: TOCTOU exploits, data corruption, or privilege escalation.
CVE-2026-53715 has a CVSS score of 5.3 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.8.1, 1.7.4); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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github.com/envoyproxy/gateway to 1.8.1 or later; github.com/envoyproxy/gateway to 1.7.4 or later
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2026-53715? CVE-2026-53715 is a medium-severity race condition vulnerability in github.com/envoyproxy/gateway (go), affecting versions >= 1.8.0-rc.0, < 1.8.1. It is fixed in 1.8.1, 1.7.4. Multiple concurrent operations access a shared resource without proper synchronization, producing unpredictable results depending on timing.
- How severe is CVE-2026-53715? CVE-2026-53715 has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of github.com/envoyproxy/gateway are affected by CVE-2026-53715? github.com/envoyproxy/gateway (go) versions >= 1.8.0-rc.0, < 1.8.1 is affected.
- Is there a fix for CVE-2026-53715? Yes. CVE-2026-53715 is fixed in 1.8.1, 1.7.4. Upgrade to this version or later.
- Is CVE-2026-53715 exploitable, and should I be worried? Whether CVE-2026-53715 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-53715 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-53715?
- Upgrade
github.com/envoyproxy/gatewayto 1.8.1 or later - Upgrade
github.com/envoyproxy/gatewayto 1.7.4 or later
- Upgrade