Vulnerability-Lookup

CVE-2026-15709 (GCVE-0-2026-15709)

Vulnerability from cvelistv5 – Published: 2026-07-14 19:41 – Updated: 2026-07-15 12:58

Title

Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service

Summary

A flaw was found in libsoup's WebSocket implementation when using the permessage-deflate extension. The extension's decompression loop (inflate()) processes data in chunks without enforcing an upper boundary limit on the output buffer size. While libsoup limits the incoming compressed frame size via max_incoming_payload_size, it fails to track or limit memory allocation during decompression. A separate check for decompressed size (max_total_message_size) exists but executes only after inflation is complete, and it is entirely disabled by default for client connections. A remote, unauthenticated attacker can exploit this by sending a small, highly compressed payload (a decompression bomb), causing unbounded memory allocation that triggers an Out-of-Memory (OOM) crash and a Denial of Service (DoS).

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 12:58 UTC

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

redhat redhat root

References

3 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-15709	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2499922	issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/libsoup/-/issues/511

Impacted products

5 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Date Public

2026-07-14 09:42

Credits

Red Hat would like to thank Tristan Madani for reporting this issue.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-15709

Vulnerability from fkie_nvd - Published: 2026-07-14 20:16 - Updated: 2026-07-15 18:20

Severity

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
	secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-15709
	secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2499922
	secalert@redhat.com	https://gitlab.gnome.org/GNOME/libsoup/-/issues/511
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://gitlab.gnome.org/GNOME/libsoup/-/issues/511

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "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": "secalert@redhat.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-15709",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-15T12:58:14.451474Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-14T20:16:57.027",
  "references": [
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/security/cve/CVE-2026-15709"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499922"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/511"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/511"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-409"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}

GHSA-GV2G-7H3V-Q5F3

Vulnerability from github – Published: 2026-07-14 21:32 – Updated: 2026-07-14 21:32

Details

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-15709"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-409"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-14T20:16:57Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in libsoup\u0027s WebSocket implementation when using the permessage-deflate extension. The extension\u0027s decompression loop (inflate()) processes data in chunks without enforcing an upper boundary limit on the output buffer size. While libsoup limits the incoming compressed frame size via max_incoming_payload_size, it fails to track or limit memory allocation during decompression. A separate check for decompressed size (max_total_message_size) exists but executes only after inflation is complete, and it is entirely disabled by default for client connections. A remote, unauthenticated attacker can exploit this by sending a small, highly compressed payload (a decompression bomb), causing unbounded memory allocation that triggers an Out-of-Memory (OOM) crash and a Denial of Service (DoS).",
  "id": "GHSA-gv2g-7h3v-q5f3",
  "modified": "2026-07-14T21:32:16Z",
  "published": "2026-07-14T21:32:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15709"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-15709"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499922"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/511"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-15709

Vulnerability from csaf_microsoft - Published: 2026-07-17 01:01 - Updated: 2026-07-17 01:01

Summary

Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-15709

7.5 (High)


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

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	None Available

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-15709 Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-15709.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service",
    "tracking": {
      "current_release_date": "2026-07-17T01:01:57.000Z",
      "generator": {
        "date": "2026-07-17T07:03:59.708Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-15709",
      "initial_release_date": "2026-07-17T01:01:57.000Z",
      "revision_history": [
        {
          "date": "2026-07-17T01:01:57.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 libsoup 0:3.4.4-16.azl3",
                "product": {
                  "name": "azl3 libsoup 0:3.4.4-16.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "libsoup"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 libsoup 0:3.4.4-16.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-15709",
      "cwe": {
        "id": "CWE-409",
        "name": "Improper Handling of Highly Compressed Data (Data Amplification)"
      },
      "notes": [
        {
          "category": "general",
          "text": "redhat",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-15709 Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-15709.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-07-17T01:01:57.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "environmentalScore": 0.0,
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 7.5,
            "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"
          },
          "products": [
            "17084-1"
          ]
        }
      ],
      "title": "Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service"
    }
  ]
}

ubuntu-cve-2026-15709

Vulnerability from osv_ubuntu

Published

2026-07-14 20:16

Modified

2026-07-14 20:16

Summary

Details

Severity

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-15709	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-15709	REPORT
	https://access.redhat.com/security/cve/CVE-2026-15709	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2499922	REPORT
	https://gitlab.gnome.org/GNOME/libsoup/-/issues/511	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-soup-2.4",
            "binary_version": "2.52.2-1ubuntu0.3+esm6"
          },
          {
            "binary_name": "libsoup-gnome2.4-1",
            "binary_version": "2.52.2-1ubuntu0.3+esm6"
          },
          {
            "binary_name": "libsoup2.4-1",
            "binary_version": "2.52.2-1ubuntu0.3+esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.52.2-1ubuntu0.3+esm6?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.50.0-2debian1",
        "2.52.1-1",
        "2.52.2-1",
        "2.52.2-1ubuntu0.1",
        "2.52.2-1ubuntu0.2",
        "2.52.2-1ubuntu0.3",
        "2.52.2-1ubuntu0.3+esm1",
        "2.52.2-1ubuntu0.3+esm2",
        "2.52.2-1ubuntu0.3+esm3",
        "2.52.2-1ubuntu0.3+esm4",
        "2.52.2-1ubuntu0.3+esm5",
        "2.52.2-1ubuntu0.3+esm6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-soup-2.4",
            "binary_version": "2.62.1-1ubuntu0.4+esm7"
          },
          {
            "binary_name": "libsoup-gnome2.4-1",
            "binary_version": "2.62.1-1ubuntu0.4+esm7"
          },
          {
            "binary_name": "libsoup2.4-1",
            "binary_version": "2.62.1-1ubuntu0.4+esm7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.62.1-1ubuntu0.4+esm7?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.60.1-1",
        "2.60.2-1",
        "2.60.2-2",
        "2.60.3-1",
        "2.61.90-1",
        "2.62.0-1",
        "2.62.1-1",
        "2.62.1-1ubuntu0.1",
        "2.62.1-1ubuntu0.3",
        "2.62.1-1ubuntu0.4",
        "2.62.1-1ubuntu0.4+esm1",
        "2.62.1-1ubuntu0.4+esm2",
        "2.62.1-1ubuntu0.4+esm3",
        "2.62.1-1ubuntu0.4+esm4",
        "2.62.1-1ubuntu0.4+esm5",
        "2.62.1-1ubuntu0.4+esm6",
        "2.62.1-1ubuntu0.4+esm7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-soup-2.4",
            "binary_version": "2.70.0-1ubuntu0.5+esm2"
          },
          {
            "binary_name": "libsoup-gnome2.4-1",
            "binary_version": "2.70.0-1ubuntu0.5+esm2"
          },
          {
            "binary_name": "libsoup2.4-1",
            "binary_version": "2.70.0-1ubuntu0.5+esm2"
          },
          {
            "binary_name": "libsoup2.4-tests",
            "binary_version": "2.70.0-1ubuntu0.5+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.70.0-1ubuntu0.5+esm2?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.68.2-0ubuntu1",
        "2.68.2-1",
        "2.68.2-2",
        "2.68.2-2build2",
        "2.69.90-1",
        "2.70.0-1",
        "2.70.0-1ubuntu0.1",
        "2.70.0-1ubuntu0.2",
        "2.70.0-1ubuntu0.3",
        "2.70.0-1ubuntu0.4",
        "2.70.0-1ubuntu0.5",
        "2.70.0-1ubuntu0.5+esm1",
        "2.70.0-1ubuntu0.5+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
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          },
          {
            "binary_name": "libsoup-gnome2.4-1",
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          {
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          },
          {
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          },
          {
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            "binary_version": "2.74.2-3ubuntu0.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.74.2-3ubuntu0.7?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.72.0-3ubuntu3",
        "2.74.1-1",
        "2.74.2-2",
        "2.74.2-3",
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        "2.74.2-3ubuntu0.2",
        "2.74.2-3ubuntu0.3",
        "2.74.2-3ubuntu0.4",
        "2.74.2-3ubuntu0.5",
        "2.74.2-3ubuntu0.6",
        "2.74.2-3ubuntu0.7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-soup-3.0",
            "binary_version": "3.0.7-0ubuntu1+esm7"
          },
          {
            "binary_name": "libsoup-3.0-0",
            "binary_version": "3.0.7-0ubuntu1+esm7"
          },
          {
            "binary_name": "libsoup-3.0-common",
            "binary_version": "3.0.7-0ubuntu1+esm7"
          },
          {
            "binary_name": "libsoup-3.0-tests",
            "binary_version": "3.0.7-0ubuntu1+esm7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "libsoup3",
        "purl": "pkg:deb/ubuntu/libsoup3@3.0.7-0ubuntu1+esm7?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.4-2",
        "3.0.4-3",
        "3.0.5-1",
        "3.0.7-0ubuntu1",
        "3.0.7-0ubuntu1+esm1",
        "3.0.7-0ubuntu1+esm2",
        "3.0.7-0ubuntu1+esm3",
        "3.0.7-0ubuntu1+esm4",
        "3.0.7-0ubuntu1+esm5",
        "3.0.7-0ubuntu1+esm6",
        "3.0.7-0ubuntu1+esm7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-soup-2.4",
            "binary_version": "2.74.3-6ubuntu1.7"
          },
          {
            "binary_name": "libsoup-2.4-1",
            "binary_version": "2.74.3-6ubuntu1.7"
          },
          {
            "binary_name": "libsoup-gnome-2.4-1",
            "binary_version": "2.74.3-6ubuntu1.7"
          },
          {
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            "binary_version": "2.74.3-6ubuntu1.7"
          },
          {
            "binary_name": "libsoup2.4-tests",
            "binary_version": "2.74.3-6ubuntu1.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.74.3-6ubuntu1.7?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
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          ],
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      ],
      "versions": [
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        "2.74.3-6build1",
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      ]
    },
    {
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          },
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            "binary_version": "3.4.4-5ubuntu0.7"
          },
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            "binary_version": "3.4.4-5ubuntu0.7"
          },
          {
            "binary_name": "libsoup-3.0-tests",
            "binary_version": "3.4.4-5ubuntu0.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libsoup3",
        "purl": "pkg:deb/ubuntu/libsoup3@3.4.4-5ubuntu0.7?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.2-4",
        "3.4.4-1",
        "3.4.4-2",
        "3.4.4-4",
        "3.4.4-5",
        "3.4.4-5build1",
        "3.4.4-5build2",
        "3.4.4-5ubuntu0.1",
        "3.4.4-5ubuntu0.2",
        "3.4.4-5ubuntu0.3",
        "3.4.4-5ubuntu0.4",
        "3.4.4-5ubuntu0.5",
        "3.4.4-5ubuntu0.6",
        "3.4.4-5ubuntu0.7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-soup-3.0",
            "binary_version": "3.6.6-1"
          },
          {
            "binary_name": "libsoup-3.0-0",
            "binary_version": "3.6.6-1"
          },
          {
            "binary_name": "libsoup-3.0-common",
            "binary_version": "3.6.6-1"
          },
          {
            "binary_name": "libsoup-3.0-tests",
            "binary_version": "3.6.6-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libsoup3",
        "purl": "pkg:deb/ubuntu/libsoup3@3.6.6-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.6.5-4",
        "3.6.5-5",
        "3.6.5-6",
        "3.6.5-7",
        "3.6.5-9",
        "3.6.6-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-soup-2.4",
            "binary_version": "2.74.3-10.1ubuntu5+esm1"
          },
          {
            "binary_name": "libsoup-2.4-1",
            "binary_version": "2.74.3-10.1ubuntu5+esm1"
          },
          {
            "binary_name": "libsoup-gnome-2.4-1",
            "binary_version": "2.74.3-10.1ubuntu5+esm1"
          },
          {
            "binary_name": "libsoup2.4-common",
            "binary_version": "2.74.3-10.1ubuntu5+esm1"
          },
          {
            "binary_name": "libsoup2.4-tests",
            "binary_version": "2.74.3-10.1ubuntu5+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.74.3-10.1ubuntu5+esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.74.3-10.1ubuntu4",
        "2.74.3-10.1ubuntu5",
        "2.74.3-10.1ubuntu5+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in libsoup\u0027s WebSocket implementation when using the permessage-deflate extension. The extension\u0027s decompression loop (inflate()) processes data in chunks without enforcing an upper boundary limit on the output buffer size. While libsoup limits the incoming compressed frame size via max_incoming_payload_size, it fails to track or limit memory allocation during decompression. A separate check for decompressed size (max_total_message_size) exists but executes only after inflation is complete, and it is entirely disabled by default for client connections. A remote, unauthenticated attacker can exploit this by sending a small, highly compressed payload (a decompression bomb), causing unbounded memory allocation that triggers an Out-of-Memory (OOM) crash and a Denial of Service (DoS).",
  "id": "UBUNTU-CVE-2026-15709",
  "modified": "2026-07-14T20:16:00Z",
  "published": "2026-07-14T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-15709"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-15709"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-15709"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499922"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/511"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-15709"
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-15709 (GCVE-0-2026-15709)

FKIE_CVE-2026-15709

GHSA-GV2G-7H3V-Q5F3

MSRC_CVE-2026-15709

ubuntu-cve-2026-15709

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature