CVE-2026-26309 - Vulnerability Analysis
MediumCVSS: 5.3Last Updated: March 11, 2026
Envoy - Out-of-Bounds Read & Denial of Service
Published: March 10, 2026Updated: March 11, 2026PoC AvailableRemote Exploitable
Overview
Envoy < 1.37.1, 1.36.5, 1.35.8, and 1.34.13 contains an off-by-one write in Envoy::JsonEscaper::escapeString() causing std::string null-termination corruption, letting attackers cause crashes or out-of-bounds reads, exploit requires crafted input.
Severity & Score
Severity: Medium
CVSS Score: 5.3
Impact
Attackers can cause crashes or out-of-bounds reads leading to denial of service or undefined behavior.
Mitigation
Update to versions 1.37.1, 1.36.5, 1.35.8, or 1.34.13 or later.
Related Resources
Details
- CVE ID
- CVE-2026-26309
- Severity
- Medium
- CVSS Score
- 5.3
- Type
- out_of_bounds_rw
- Status
- confirmed
CWE
- CWE-193
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L