Vulnerability-Lookup

CVE-2026-48706 (GCVE-0-2026-48706)

Vulnerability from cvelistv5 – Published: 2026-06-26 17:38 – Updated: 2026-06-26 19:05

Title

Envoy Heap Buffer Overflow in TcpStatsdSink

Summary

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, a vulnerability exists in Envoy's TCP StatsD sink (TcpStatsdSink), where the thread-local flusher buffer can be overflowed by exceptionally long statistic names (e.g., >16KiB). During formatting, TcpStatsdSink reserves a single contiguous memory slice of 16KiB (FLUSH_SLICE_SIZE_BYTES). If formatting a single metric exceeds the remaining capacity, the flusher initiates a buffer rotation but incorrectly continues to allocate another fixed 16KiB slice. If an attacker can trigger a statistic name longer than 16KiB—for example, by sending an HTTP or gRPC request with an extremely long request path (:path) that is recorded by the grpc_stats filter configured with stats_for_all_methods: true—the flusher will attempt to copy the metric name using memcpy operations beyond the allocated heap buffer boundaries. This leads to a heap write overflow, which can cause immediate denial-of-service (process crash) or potential remote code execution (RCE). This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-26 19:05 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/envoyproxy/envoy/security/advi…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
envoyproxy	envoy	Affected: >= 1.38.0, < 1.38.3 Affected: >= 1.37.0, < 1.37.5 Affected: >= 1.36.0, < 1.36.9 Affected: >= 1.34.0, < 1.35.13	guessed

Show details on NVD website

JSON

To clipboard

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}

bit-envoy-2026-48706

Vulnerability from bitnami_vulndb

Published

2026-06-30 23:39

Modified

2026-09-08 08:34

Summary

Envoy Heap Buffer Overflow in TcpStatsdSink

Details

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "envoy",
        "purl": "pkg:bitnami/envoy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.34.0"
            },
            {
              "fixed": "1.35.13"
            },
            {
              "introduced": "1.36.0"
            },
            {
              "fixed": "1.36.9"
            },
            {
              "introduced": "1.37.0"
            },
            {
              "fixed": "1.37.5"
            },
            {
              "introduced": "1.38.0"
            },
            {
              "fixed": "1.38.3"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-48706"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, a vulnerability exists in Envoy\u0027s TCP StatsD sink (TcpStatsdSink), where the thread-local flusher buffer can be overflowed by exceptionally long statistic names (e.g., \u003e16KiB). During formatting, TcpStatsdSink reserves a single contiguous memory slice of 16KiB (FLUSH_SLICE_SIZE_BYTES). If formatting a single metric exceeds the remaining capacity, the flusher initiates a buffer rotation but incorrectly continues to allocate another fixed 16KiB slice. If an attacker can trigger a statistic name longer than 16KiB\u2014for example, by sending an HTTP or gRPC request with an extremely long request path (:path) that is recorded by the grpc_stats filter configured with stats_for_all_methods: true\u2014the flusher will attempt to copy the metric name using memcpy operations beyond the allocated heap buffer boundaries. This leads to a heap write overflow, which can cause immediate denial-of-service (process crash) or potential remote code execution (RCE). This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.",
  "id": "BIT-envoy-2026-48706",
  "modified": "2026-09-08T08:34:36.952Z",
  "published": "2026-06-30T23:39:38.029Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-7q3f-gwg7-j8g4"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48706"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Envoy Heap Buffer Overflow in TcpStatsdSink"
}

FKIE_CVE-2026-48706

Vulnerability from fkie_nvd - Published: 2026-06-26 18:17 - Updated: 2026-06-29 18:34

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/envoyproxy/envoy/security/advisories/GHSA-7q3f-gwg7-j8g4	Vendor Advisory, Mitigation

Impacted products

Vendor	Product	Version
envoyproxy	envoy	*
envoyproxy	envoy	*
envoyproxy	envoy	*
envoyproxy	envoy	*

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{
  "affected": [
    {
      "affectedData": [
        {
          "product": "envoy",
          "vendor": "envoyproxy",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.38.0, \u003c 1.38.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.37.0, \u003c 1.37.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.36.0, \u003c 1.36.9"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.34.0, \u003c 1.35.13"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "FCF9A646-8301-48C6-9A3D-F53AFAE75C39",
              "versionEndExcluding": "1.35.13",
              "versionStartIncluding": "1.34.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B1146A14-3C49-48C3-BC2A-1BBB202EBD84",
              "versionEndExcluding": "1.36.9",
              "versionStartIncluding": "1.36.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2057BF79-00D1-4154-9DC0-3F278C72F4E1",
              "versionEndExcluding": "1.37.5",
              "versionStartIncluding": "1.37.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2A218AD4-BF4B-46EA-96D7-3B25B7E71AC8",
              "versionEndExcluding": "1.38.3",
              "versionStartIncluding": "1.38.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, a vulnerability exists in Envoy\u0027s TCP StatsD sink (TcpStatsdSink), where the thread-local flusher buffer can be overflowed by exceptionally long statistic names (e.g., \u003e16KiB). During formatting, TcpStatsdSink reserves a single contiguous memory slice of 16KiB (FLUSH_SLICE_SIZE_BYTES). If formatting a single metric exceeds the remaining capacity, the flusher initiates a buffer rotation but incorrectly continues to allocate another fixed 16KiB slice. If an attacker can trigger a statistic name longer than 16KiB\u2014for example, by sending an HTTP or gRPC request with an extremely long request path (:path) that is recorded by the grpc_stats filter configured with stats_for_all_methods: true\u2014the flusher will attempt to copy the metric name using memcpy operations beyond the allocated heap buffer boundaries. This leads to a heap write overflow, which can cause immediate denial-of-service (process crash) or potential remote code execution (RCE). This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3."
    }
  ],
  "id": "CVE-2026-48706",
  "lastModified": "2026-06-29T18:34:15.677",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-48706",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-26T19:05:13.902352Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-26T18:17:00.027",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory",
        "Mitigation"
      ],
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-7q3f-gwg7-j8g4"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

OPENSUSE-SU-2026:11141-1

Vulnerability from csaf_opensuse - Published: 2026-06-28 00:00 - Updated: 2026-09-17 17:11

Summary

istioctl-1.30.2-1.1 on GA media

Severity

Moderate

Scope

14 vulnerabilities in this advisory, including CVE-2026-48706.

CVE-2026-48706

Recommended: 12 products

Open the full advisory

RHSA-2026:49729

Vulnerability from csaf_redhat - Published: 2026-08-03 17:08 - Updated: 2026-09-25 21:03

Summary

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.1.11

Severity

Important

Scope

6 vulnerabilities in this advisory, including CVE-2026-48706.

CVE-2026-48706

A flaw was found in Envoy, an open-source edge and service proxy. An attacker can exploit a heap write overflow vulnerability in Envoy's TCP StatsD sink by sending exceptionally long statistic names, such as those found in HTTP or gRPC request paths. This can lead to a denial-of-service, causing the process to crash, and potentially enable remote code execution.

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 21 products

https://access.redhat.com/errata/RHSA-2026:49729

Open the full advisory

RHSA-2026:49744

Vulnerability from csaf_redhat - Published: 2026-08-03 17:33 - Updated: 2026-09-25 21:03

Summary

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.2.8

Severity

Important

Scope

7 vulnerabilities in this advisory, including CVE-2026-48706.

CVE-2026-48706

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 21 products

https://access.redhat.com/errata/RHSA-2026:49744

Open the full advisory

RHSA-2026:49765

Vulnerability from csaf_redhat - Published: 2026-08-03 18:05 - Updated: 2026-09-25 21:03

Summary

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.3.6

Severity

Important

Scope

7 vulnerabilities in this advisory, including CVE-2026-48706.

CVE-2026-48706

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 21 products

https://access.redhat.com/errata/RHSA-2026:49765

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-48706 (GCVE-0-2026-48706)

bit-envoy-2026-48706

Vulnerability from bitnami_vulndb

FKIE_CVE-2026-48706

OPENSUSE-SU-2026:11141-1

RHSA-2026:49729

RHSA-2026:49744

RHSA-2026:49765

Tags

Sightings

Nomenclature

Related by attack behaviour