Is github.com/envoyproxy/envoy affected by CVE-2026-26308?

Go github.com/envoyproxy/envoy is affected in >=1.37.0 =1.36.0 =1.35.0 <1.35.9, <1.34.13.

Is CVE-2026-26308 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

high

CVE-2026-26308

Q: Is CVE-2026-26308 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

Go · github.com/envoyproxy/envoy

Summary

Envoy has RBAC Header Validation Bypass via Multi-Value Header Concatenation

Severity: high
EPSS: 0.3% (p21)
Also known as: GHSA-ghc4-35x6-crw5, BIT-envoy-2026-26308
Published: 2026-03-10

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-ghc4-35x6-crw5
https://nvd.nist.gov/vuln/detail/CVE-2026-26308
https://github.com/envoyproxy/envoy/commit/b6ba0b2294b98484fb0ed8556897d1073cc27867

Related advisories

CVE-2026-26330 — medium · Go/github.com/envoyproxy/envoy
CVE-2026-26311 — medium · Go/github.com/envoyproxy/envoy
CVE-2026-26309 — medium · Go/github.com/envoyproxy/envoy
CVE-2026-26310 — medium · Go/github.com/envoyproxy/envoy

Is your project exposed to this? Stateward checks every dependency on every pull request and flags it only if your code actually reaches it.

Check my repo

Summarize with AI

ChatGPT Claude Perplexity

Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.