Off-by-one Error Affecting envoyproxy/envoy package, versions [,1.34.13)[1.35.0,1.35.9)[1.36.0,1.36.5)[1.37.0,1.37.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ENVOYPROXYENVOY-15466265
- published12 Mar 2026
- disclosed10 Mar 2026
- creditFinder16
Introduced: 10 Mar 2026
CVE-2026-26309 (opens in a new tab)How to fix?
Upgrade envoyproxy/envoy to version 1.34.13, 1.35.9, 1.36.5, 1.37.1 or higher.
Overview
Affected versions of this package are vulnerable to Off-by-one Error through the escapeString function. An attacker can cause memory corruption or application crashes by triggering an off-by-one write that corrupts string null-termination, potentially leading to undefined behavior or out-of-bounds reads.