CVE-2026-26309

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Source
https://cve.org/CVERecord?id=CVE-2026-26309
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26309.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-26309
Aliases
Published
2026-03-10T19:04:21.384Z
Modified
2026-07-15T02:18:13.760328267Z
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"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26309.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/envoyproxy/envoy

Affected ranges

Type
GIT
Repo
https://github.com/envoyproxy/envoy
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
7c0fda3dc457de6ee4585e8129e3f5728d65f367
Introduced
84305a6cb64bd55aaf606bdd53de7cd6080427a1
Fixed
9a0cdcadabcb7baa2348afa1178e083f8d0fe2d7
Introduced
63ee0dc79dce88117c6bd2df5a742f8eb67ea980
Fixed
41749943780b54b70b510b1b1a4805ae529e174a
Introduced
6d9bb7d9a85d616b220d1f8fe67b61f82bbdb8d3
Last affected
6d9bb7d9a85d616b220d1f8fe67b61f82bbdb8d3
Database specific 
{
    "cpe": [
        "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
        "cpe:2.3:a:envoyproxy:envoy:1.37.0:*:*:*:*:*:*:*"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.34.13"
        },
        {
            "introduced": "1.35.0"
        },
        {
            "fixed": "1.35.8"
        },
        {
            "introduced": "1.36.0"
        },
        {
            "fixed": "1.36.5"
        },
        {
            "introduced": "1.37.0"
        },
        {
            "last_affected": "1.37.0"
        }
    ],
    "source": [
        "CPE_RANGE",
        "CPE_STRING"
    ]
}

Affected versions

1.*
1.37.0
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
v1.36.0
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

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26309.json"