CVE-2026-26309
- Source
- https://cve.org/CVERecord?id=CVE-2026-26309
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-26309.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-26309
- Aliases
- Published
- 2026-03-10T19:04:21.384Z
- Modified
- 2026-03-13T13:45:54.908406Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- Envoy has an off-by-one write in JsonEscaper::escapeString()
- Details
-
Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, an off-by-one write in Envoy::JsonEscaper::escapeString() can corrupt std::string null-termination, causing undefined behavior and potentially leading to crashes or out-of-bounds reads when the resulting string is later treated as a C-string. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
- Database specific
{ "cwe_ids": [ "CWE-193" ], "cna_assigner": "GitHub_M", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26309.json" }- References
Affected packages
Git / github.com/envoyproxy/envoy
Affected ranges
- Type
- GIT
- Repo
- https://github.com/envoyproxy/envoy
- Events
- Database specific
{ "versions": [ { "introduced": "1.37.0" }, { "fixed": "1.37.1" } ] }
- Type
- GIT
- Repo
- https://github.com/envoyproxy/envoy
- Events
- Database specific
{ "versions": [ { "introduced": "1.36.0" }, { "fixed": "1.36.5" } ] }
Affected versions
v1.*
v1.0.0
v1.1.0
v1.10.0
v1.11.0
v1.12.0
v1.13.0
v1.14.0
v1.15.0
v1.16.0
v1.17.0
v1.18.0
v1.18.1
v1.18.2
v1.19.0
v1.2.0
v1.20.0
v1.21.0
v1.22.0
v1.23.0
v1.24.0
v1.25.0
v1.26.0
v1.27.0
v1.28.0
v1.29.0
v1.3.0
v1.30.0
v1.31.0
v1.32.0
v1.33.0
v1.34.0
v1.34.1
v1.34.10
v1.34.11
v1.34.12
v1.34.2
v1.34.3
v1.34.4
v1.34.5
v1.34.6
v1.34.7
v1.34.8
v1.34.9
v1.35.0
v1.35.1
v1.35.2
v1.35.3
v1.35.4
v1.35.5
v1.35.6
v1.35.7
v1.35.8
v1.36.0
v1.36.1
v1.36.2
v1.36.3
v1.36.4
v1.37.0
v1.4.0
v1.5.0
v1.6.0
v1.7.0
v1.8.0
v1.9.0