Vulnerability-Lookup

CVE-2026-18588 (GCVE-0-2026-18588)

Vulnerability from cvelistv5 – Published: 2026-08-03 06:00 – Updated: 2026-08-03 15:03

Title

Wavlink WL-NU516U1 nas.cgi fgets stack-based overflow

Summary

A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Severity

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C

9.8 (Critical)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 14:59 UTC

CWE

CWE-121 - Stack-based Buffer Overflow
CWE-119 - Memory Corruption

Assigner

VulDB CNA under the mitre root

CNA scorecard B 83/100 over 3854 records in the last 180 days details

References

6 references

URL	Tags
https://vuldb.com/vuln/385416	vdb-entrytechnical-description
https://vuldb.com/vuln/385416/cti	signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18588	third-party-advisory
https://vuldb.com/submit/850500	third-party-advisory
https://github.com/oduoke567/WAVLINK-NU516U1-2026…	broken-link
https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U…	broken-linkpatch

Impacted products

1 product

Vendor	Product	Version	CPE status
Wavlink	WL-NU516U1	Affected: 708c073-mt7628 cpe:2.3:o:wavlink:wl-nu516u1_firmware::::::::

Credits

oduoke (VulDB User) VulDB CNA Team

Show details on NVD website

JSON

To clipboard

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        "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "assignerShortName": "VulDB",
        "cveId": "CVE-2026-18588",
        "datePublished": "2026-08-03T06:00:11.107Z",
        "dateReserved": "2026-08-02T20:33:29.434Z",
        "dateUpdated": "2026-08-03T15:03:20.669Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

CNVD-2026-34263

Vulnerability from cnvd - Published: 2026-08-28

Title

WAVLINK WL-NU516U1栈缓冲区溢出漏洞

Description

WAVLINK WL-NU516U1是一款面向家庭和小型办公场景的无线路由器设备。 WAVLINK WL-NU516U1存在栈缓冲区溢出漏洞，该漏洞源于文件nas.cgi中函数fgets在处理CONTENT_LENGTH参数时未能正确验证输入数据的长度大小，攻击者可利用该漏洞在系统上执行任意代码或者导致拒绝服务攻击。

Severity

高

Formal description

目前厂商尚未发布升级程序修复该安全问题，详情见厂商官网： https://www.wavlink.com/

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-18588

Impacted products

Name
WAVLINK WL-NU516U1 708c073-mt7628

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-18588",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-18588"
    }
  },
  "description": "WAVLINK WL-NU516U1\u662f\u4e00\u6b3e\u9762\u5411\u5bb6\u5ead\u548c\u5c0f\u578b\u529e\u516c\u573a\u666f\u7684\u65e0\u7ebf\u8def\u7531\u5668\u8bbe\u5907\u3002\n\nWAVLINK WL-NU516U1\u5b58\u5728\u6808\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u6587\u4ef6nas.cgi\u4e2d\u51fd\u6570fgets\u5728\u5904\u7406CONTENT_LENGTH\u53c2\u6570\u65f6\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1\u8f93\u5165\u6570\u636e\u7684\u957f\u5ea6\u5927\u5c0f\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5728\u7cfb\u7edf\u4e0a\u6267\u884c\u4efb\u610f\u4ee3\u7801\u6216\u8005\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u653b\u51fb\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5c1a\u672a\u53d1\u5e03\u5347\u7ea7\u7a0b\u5e8f\u4fee\u590d\u8be5\u5b89\u5168\u95ee\u9898\uff0c\u8be6\u60c5\u89c1\u5382\u5546\u5b98\u7f51\uff1a\r\nhttps://www.wavlink.com/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-34263",
  "openTime": "2026-08-28",
  "products": {
    "product": "WAVLINK WL-NU516U1 708c073-mt7628"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-18588",
  "serverity": "\u9ad8",
  "submitTime": "2026-08-06",
  "title": "WAVLINK WL-NU516U1\u6808\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e"
}

FKIE_CVE-2026-18588

Vulnerability from fkie_nvd - Published: 2026-08-03 07:16 - Updated: 2026-10-23 22:10

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	cna@vuldb.com	https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin
	cna@vuldb.com	https://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.md
	cna@vuldb.com	https://vuldb.com/cve/CVE-2026-18588
	cna@vuldb.com	https://vuldb.com/submit/850500
	cna@vuldb.com	https://vuldb.com/vuln/385416
	cna@vuldb.com	https://vuldb.com/vuln/385416/cti
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://vuldb.com/submit/850500

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:o:wavlink:wl-nu516u1_firmware:*:*:*:*:*:*:*:*"
          ],
          "product": "WL-NU516U1",
          "vendor": "Wavlink",
          "versions": [
            {
              "status": "affected",
              "version": "708c073-mt7628"
            }
          ]
        }
      ],
      "source": "cna@vuldb.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product."
    },
    {
      "lang": "es",
      "value": "Se ha encontrado una vulnerabilidad en Wavlink WL-NU516U1 708c073-mt7628. Esta afecta la funci\u00f3n fgets del archivo nas.cgi. La manipulaci\u00f3n del argumento CONTENT_LENGTH conduce a un desbordamiento de b\u00fafer basado en pila. La explotaci\u00f3n remota del ataque es posible. Deber\u00eda actualizar el componente afectado. Se contact\u00f3 al proveedor con antelaci\u00f3n, respondi\u00f3 de manera muy profesional y lanz\u00f3 r\u00e1pidamente una versi\u00f3n corregida del producto afectado."
    }
  ],
  "id": "CVE-2026-18588",
  "lastModified": "2026-10-23T22:10:00.160",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 10.0,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "cna@vuldb.com",
        "type": "Secondary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "cna@vuldb.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@vuldb.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-18588",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-03T14:59:51.052277Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-03T07:16:43.047",
  "references": [
    {
      "source": "cna@vuldb.com",
      "url": "https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.md"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/cve/CVE-2026-18588"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/submit/850500"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/vuln/385416"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/vuln/385416/cti"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://vuldb.com/submit/850500"
    }
  ],
  "sourceIdentifier": "cna@vuldb.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        },
        {
          "lang": "en",
          "value": "CWE-121"
        }
      ],
      "source": "cna@vuldb.com",
      "type": "Secondary"
    }
  ]
}

GHSA-HFJ9-7VRJ-JWV3

Vulnerability from github – Published: 2026-08-03 09:32 – Updated: 2026-08-03 09:32

Details

Severity

9.8 (Critical)


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

9.3 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-18588"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-119"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-03T07:16:43Z",
    "severity": "CRITICAL"
  },
  "details": "A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.",
  "id": "GHSA-hfj9-7vrj-jwv3",
  "modified": "2026-08-03T09:32:37Z",
  "published": "2026-08-03T09:32:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18588"
    },
    {
      "type": "WEB",
      "url": "https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin"
    },
    {
      "type": "WEB",
      "url": "https://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.md"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/cve/CVE-2026-18588"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/850500"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/385416"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/385416/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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-2026-18588 (GCVE-0-2026-18588)

CNVD-2026-34263

FKIE_CVE-2026-18588

GHSA-HFJ9-7VRJ-JWV3

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour