Vulnerability-Lookup

CVE-2026-6986 (GCVE-0-2026-6986)

Vulnerability from cvelistv5 – Published: 2026-04-25 16:30 – Updated: 2026-04-27 13:36 X_Open Source

Title

Cesanta Mongoose GCM Authentication Tag tls_aes128.c mg_aes_gcm_decrypt signature verification

Summary

A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. Such manipulation leads to improper verification of cryptographic signature. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 7.21 is capable of addressing this issue. It is advisable to upgrade the affected component. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.

Severity

6.3 (Medium)


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

3.7 (Low)


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

3.7 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-27 13:33 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature
CWE-345 - Insufficient Verification of Data Authenticity

Assigner

VulDB CNA under the mitre root

CNA scorecard B 83/100 over 3775 records in the last 180 days details

References

5 references

URL	Tags
https://vuldb.com/vuln/359529	vdb-entrytechnical-description
https://vuldb.com/vuln/359529/cti	signaturepermissions-required
https://vuldb.com/submit/796231	third-party-advisory
https://github.com/dwBruijn/CVEs/blob/main/Mongoo…	exploit
https://github.com/cesanta/mongoose/releases/tag/7.21	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
Cesanta	Mongoose	Affected: 7.0 Affected: 7.1 Affected: 7.2 Affected: 7.3 Affected: 7.4 Affected: 7.5 Affected: 7.6 Affected: 7.7 Affected: 7.8 Affected: 7.9 Affected: 7.10 Affected: 7.11 Affected: 7.12 Affected: 7.13 Affected: 7.14 Affected: 7.15 Affected: 7.16 Affected: 7.17 Affected: 7.18 Affected: 7.19 Affected: 7.20 Unaffected: 7.21 cpe:2.3:a:cesanta:mongoose::::::::

Credits

dwbruijn (VulDB User) VulDB CNA Team

Show details on NVD website

JSON

To clipboard

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                  "version": "7.3"
                },
                {
                  "status": "affected",
                  "version": "7.4"
                },
                {
                  "status": "affected",
                  "version": "7.5"
                },
                {
                  "status": "affected",
                  "version": "7.6"
                },
                {
                  "status": "affected",
                  "version": "7.7"
                },
                {
                  "status": "affected",
                  "version": "7.8"
                },
                {
                  "status": "affected",
                  "version": "7.9"
                },
                {
                  "status": "affected",
                  "version": "7.10"
                },
                {
                  "status": "affected",
                  "version": "7.11"
                },
                {
                  "status": "affected",
                  "version": "7.12"
                },
                {
                  "status": "affected",
                  "version": "7.13"
                },
                {
                  "status": "affected",
                  "version": "7.14"
                },
                {
                  "status": "affected",
                  "version": "7.15"
                },
                {
                  "status": "affected",
                  "version": "7.16"
                },
                {
                  "status": "affected",
                  "version": "7.17"
                },
                {
                  "status": "affected",
                  "version": "7.18"
                },
                {
                  "status": "affected",
                  "version": "7.19"
                },
                {
                  "status": "affected",
                  "version": "7.20"
                },
                {
                  "status": "unaffected",
                  "version": "7.21"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "reporter",
              "value": "dwbruijn (VulDB User)"
            },
            {
              "lang": "en",
              "type": "coordinator",
              "value": "VulDB CNA Team"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. Such manipulation leads to improper verification of cryptographic signature. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 7.21 is capable of addressing this issue. It is advisable to upgrade the affected component. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
                "version": "4.0"
              }
            },
            {
              "cvssV3_1": {
                "baseScore": 3.7,
                "baseSeverity": "LOW",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C",
                "version": "3.1"
              }
            },
            {
              "cvssV3_0": {
                "baseScore": 3.7,
                "baseSeverity": "LOW",
                "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C",
                "version": "3.0"
              }
            },
            {
              "cvssV2_0": {
                "baseScore": 2.6,
                "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C",
                "version": "2.0"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-347",
                  "description": "Improper Verification of Cryptographic Signature",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-345",
                  "description": "Insufficient Verification of Data Authenticity",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-04-25T16:30:13.067Z",
            "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
            "shortName": "VulDB"
          },
          "references": [
            {
              "name": "VDB-359529 | Cesanta Mongoose GCM Authentication Tag tls_aes128.c mg_aes_gcm_decrypt signature verification",
              "tags": [
                "vdb-entry",
                "technical-description"
              ],
              "url": "https://vuldb.com/vuln/359529"
            },
            {
              "name": "VDB-359529 | CTI Indicators (IOB, IOC, IOA)",
              "tags": [
                "signature",
                "permissions-required"
              ],
              "url": "https://vuldb.com/vuln/359529/cti"
            },
            {
              "name": "Submit #796231 | Cesanta Mongoose 7.20 Improper Verification of Cryptographic Signature",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://vuldb.com/submit/796231"
            },
            {
              "tags": [
                "exploit"
              ],
              "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/AESGCM.md"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/cesanta/mongoose/releases/tag/7.21"
            }
          ],
          "tags": [
            "x_open-source"
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-04-24T00:00:00.000Z",
              "value": "Advisory disclosed"
            },
            {
              "lang": "en",
              "time": "2026-04-24T02:00:00.000Z",
              "value": "VulDB entry created"
            },
            {
              "lang": "en",
              "time": "2026-04-24T21:18:01.000Z",
              "value": "VulDB entry last update"
            }
          ],
          "title": "Cesanta Mongoose GCM Authentication Tag tls_aes128.c mg_aes_gcm_decrypt signature verification"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "assignerShortName": "VulDB",
        "cveId": "CVE-2026-6986",
        "datePublished": "2026-04-25T16:30:13.067Z",
        "dateReserved": "2026-04-24T19:12:51.609Z",
        "dateUpdated": "2026-04-27T13:36:06.578Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-6986

Vulnerability from fkie_nvd - Published: 2026-04-25 17:16 - Updated: 2026-10-26 21:10

Severity

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

Summary

References

URL	Tags
cna@vuldb.com	https://github.com/cesanta/mongoose/releases/tag/7.21	Release Notes
cna@vuldb.com	https://github.com/dwBruijn/CVEs/blob/main/Mongoose/AESGCM.md	Exploit, Third Party Advisory
cna@vuldb.com	https://vuldb.com/submit/796231	Third Party Advisory, VDB Entry
cna@vuldb.com	https://vuldb.com/vuln/359529	Third Party Advisory, VDB Entry
cna@vuldb.com	https://vuldb.com/vuln/359529/cti	Permissions Required, VDB Entry

Impacted products

	Vendor	Product	Version
	cesanta	mongoose	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "GCM Authentication Tag Handler"
          ],
          "product": "Mongoose",
          "vendor": "Cesanta",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "status": "affected",
              "version": "7.2"
            },
            {
              "status": "affected",
              "version": "7.3"
            },
            {
              "status": "affected",
              "version": "7.4"
            },
            {
              "status": "affected",
              "version": "7.5"
            },
            {
              "status": "affected",
              "version": "7.6"
            },
            {
              "status": "affected",
              "version": "7.7"
            },
            {
              "status": "affected",
              "version": "7.8"
            },
            {
              "status": "affected",
              "version": "7.9"
            },
            {
              "status": "affected",
              "version": "7.10"
            },
            {
              "status": "affected",
              "version": "7.11"
            },
            {
              "status": "affected",
              "version": "7.12"
            },
            {
              "status": "affected",
              "version": "7.13"
            },
            {
              "status": "affected",
              "version": "7.14"
            },
            {
              "status": "affected",
              "version": "7.15"
            },
            {
              "status": "affected",
              "version": "7.16"
            },
            {
              "status": "affected",
              "version": "7.17"
            },
            {
              "status": "affected",
              "version": "7.18"
            },
            {
              "status": "affected",
              "version": "7.19"
            },
            {
              "status": "affected",
              "version": "7.20"
            },
            {
              "status": "unaffected",
              "version": "7.21"
            }
          ]
        }
      ],
      "source": "cna@vuldb.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CFB6060D-2132-492F-8C8D-CC053CCFBC80",
              "versionEndExcluding": "7.21",
              "versionStartIncluding": "7.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. Such manipulation leads to improper verification of cryptographic signature. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 7.21 is capable of addressing this issue. It is advisable to upgrade the affected component. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de seguridad ha sido detectada en Cesanta Mongoose hasta la versi\u00f3n 7.20. Este problema afecta a la funci\u00f3n mg_aes_gcm_decrypt del archivo /src/tls_aes128.c del componente Gestor de Etiquetas de Autenticaci\u00f3n GCM. Dicha manipulaci\u00f3n conduce a una verificaci\u00f3n incorrecta de la firma criptogr\u00e1fica. El ataque puede ser realizado de forma remota. Un alto nivel de complejidad est\u00e1 asociado con este ataque. La explotabilidad se eval\u00faa como dif\u00edcil. El exploit ha sido divulgado p\u00fablicamente y puede ser utilizado. La actualizaci\u00f3n a la versi\u00f3n 7.21 es capaz de solucionar este problema. Es aconsejable actualizar el componente afectado. VulDB contact\u00f3 al proveedor con antelaci\u00f3n y ellos confirmaron r\u00e1pidamente que este problema ya fue solucionado."
    }
  ],
  "id": "CVE-2026-6986",
  "lastModified": "2026-10-26T21:10:00.170",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "HIGH",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 2.6,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 4.9,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "cna@vuldb.com",
        "type": "Secondary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.7,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 1.4,
        "source": "cna@vuldb.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.9,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "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:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@vuldb.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-6986",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-27T13:33:26.520467Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-25T17:16:33.700",
  "references": [
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/cesanta/mongoose/releases/tag/7.21"
    },
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/AESGCM.md"
    },
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "https://vuldb.com/submit/796231"
    },
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "https://vuldb.com/vuln/359529"
    },
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Permissions Required",
        "VDB Entry"
      ],
      "url": "https://vuldb.com/vuln/359529/cti"
    }
  ],
  "sourceIdentifier": "cna@vuldb.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        },
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "cna@vuldb.com",
      "type": "Secondary"
    }
  ]
}

GHSA-P5J9-FJFF-QRMR

Vulnerability from github – Published: 2026-04-25 18:32 – Updated: 2026-04-25 18:32

Details

Severity

3.7 (Low)


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

2.9 (Low)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-6986"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-345"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-25T17:16:33Z",
    "severity": "MODERATE"
  },
  "details": "A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. Such manipulation leads to improper verification of cryptographic signature. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 7.21 is capable of addressing this issue. It is advisable to upgrade the affected component. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.",
  "id": "GHSA-p5j9-fjff-qrmr",
  "modified": "2026-04-25T18:32:58Z",
  "published": "2026-04-25T18:32:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6986"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cesanta/mongoose/releases/tag/7.21"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/AESGCM.md"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/796231"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/359529"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/359529/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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"
    }
  ]
}

UBUNTU-CVE-2026-6986 (CVE-2026-6986)

Vulnerability from osv_ubuntu – Published: 2026-04-25 17:16 – Updated: 2026-10-17 09:37 – Source website

Details

Severity

3.7 (Low)


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

2.9 (Low)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-6986	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-6986	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libswupdate0.1",
            "binary_version": "2021.11-1"
          },
          {
            "binary_name": "lua-swupdate",
            "binary_version": "2021.11-1"
          },
          {
            "binary_name": "swupdate",
            "binary_version": "2021.11-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "swupdate",
        "purl": "pkg:deb/ubuntu/swupdate@2021.11-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2020.11-2",
        "2021.04-1.1",
        "2021.04-2",
        "2021.04-2build1",
        "2021.11-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libswupdate0.1",
            "binary_version": "2023.12.1+dfsg-1ubuntu5"
          },
          {
            "binary_name": "lua-swupdate",
            "binary_version": "2023.12.1+dfsg-1ubuntu5"
          },
          {
            "binary_name": "swupdate",
            "binary_version": "2023.12.1+dfsg-1ubuntu5"
          },
          {
            "binary_name": "swupdate-www",
            "binary_version": "2023.12.1+dfsg-1ubuntu5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "swupdate",
        "purl": "pkg:deb/ubuntu/swupdate@2023.12.1+dfsg-1ubuntu5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2023.05+dfsg-3",
        "2023.05+dfsg-4",
        "2023.05+dfsg-4build1",
        "2023.05+dfsg-5",
        "2023.12+dfsg-1",
        "2023.12.1+dfsg-1ubuntu1",
        "2023.12.1+dfsg-1ubuntu4",
        "2023.12.1+dfsg-1ubuntu5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libswupdate0.1",
            "binary_version": "2025.05+dfsg-2ubuntu1"
          },
          {
            "binary_name": "lua-swupdate",
            "binary_version": "2025.05+dfsg-2ubuntu1"
          },
          {
            "binary_name": "swupdate",
            "binary_version": "2025.05+dfsg-2ubuntu1"
          },
          {
            "binary_name": "swupdate-www",
            "binary_version": "2025.05+dfsg-2ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "swupdate",
        "purl": "pkg:deb/ubuntu/swupdate@2025.05+dfsg-2ubuntu1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2024.12.1+dfsg-1build2",
        "2024.12.1+dfsg-2",
        "2024.12.1+dfsg-3",
        "2025.05+dfsg-2ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libswupdate0.1",
            "binary_version": "2026.05.1+git20261001+dfsg-1ubuntu1"
          },
          {
            "binary_name": "lua-swupdate",
            "binary_version": "2026.05.1+git20261001+dfsg-1ubuntu1"
          },
          {
            "binary_name": "swupdate",
            "binary_version": "2026.05.1+git20261001+dfsg-1ubuntu1"
          },
          {
            "binary_name": "swupdate-www",
            "binary_version": "2026.05.1+git20261001+dfsg-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "swupdate",
        "purl": "pkg:deb/ubuntu/swupdate@2026.05.1+git20261001+dfsg-1ubuntu1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2025.12+dfsg-4ubuntu1",
        "2026.05+dfsg-3ubuntu2",
        "2026.05+dfsg-4ubuntu1",
        "2026.05.1+dfsg-1ubuntu1",
        "2026.05.1+git20261001+dfsg-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libswupdate0.1",
            "binary_version": "2025.12+dfsg-4ubuntu1"
          },
          {
            "binary_name": "lua-swupdate",
            "binary_version": "2025.12+dfsg-4ubuntu1"
          },
          {
            "binary_name": "swupdate",
            "binary_version": "2025.12+dfsg-4ubuntu1"
          },
          {
            "binary_name": "swupdate-www",
            "binary_version": "2025.12+dfsg-4ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "swupdate",
        "purl": "pkg:deb/ubuntu/swupdate@2025.12+dfsg-4ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2025.05+dfsg-2ubuntu1",
        "2025.05+dfsg-3ubuntu1",
        "2025.12+dfsg-1ubuntu1",
        "2025.12+dfsg-2ubuntu1",
        "2025.12+dfsg-3ubuntu1",
        "2025.12+dfsg-4ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. Such manipulation leads to improper verification of cryptographic signature. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 7.21 is capable of addressing this issue. It is advisable to upgrade the affected component. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.",
  "id": "UBUNTU-CVE-2026-6986",
  "modified": "2026-10-17T09:37:54Z",
  "published": "2026-04-25T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6986"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-6986"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-6986"
  ]
}

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

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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-2026-6986 (GCVE-0-2026-6986)

FKIE_CVE-2026-6986

GHSA-P5J9-FJFF-QRMR

UBUNTU-CVE-2026-6986 (CVE-2026-6986)

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Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour