Vulnerability-Lookup

ubuntu-cve-2026-28525

Vulnerability from osv_ubuntu

Published

2026-04-23 21:16

Modified

2026-05-27 19:09

Summary

Details

SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.

Severity

6.8 (Medium)


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

8.2 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-28525	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-28525	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": "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": "SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.",
  "id": "UBUNTU-CVE-2026-28525",
  "modified": "2026-05-27T19:09:47Z",
  "published": "2026-04-23T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-28525"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-28525"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-28525"
  ]
}

CVE-2026-28525 (GCVE-0-2026-28525)

Vulnerability from cvelistv5 – Published: 2026-04-23 20:59 – Updated: 2026-07-14 18:39

Title

SWUpdate Integer Underflow in Multipart Upload Parser

Summary

Severity

8.2 (High)


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

6.8 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-191 - Integer Underflow (Wrap or Wraparound)
CWE-125 - Out-of-bounds Read

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/sbabic/swupdate/commit/beee2dc…	patch
https://www.vulncheck.com/advisories/swupdate-int…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
sbabic	swupdate	Affected: 0 , ≤ 2025.12 (custom) Unaffected: beee2dc0feef1cfe84f1aa6fc980e104b2e47a74 (git)

Credits

Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc. VulnCheck

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-28525",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-25T01:32:10.498553Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-25T01:32:23.345Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/sbabic/swupdate",
          "product": "swupdate",
          "repo": "https://github.com/sbabic/swupdate",
          "vendor": "sbabic",
          "versions": [
            {
              "lessThanOrEqual": "2025.12",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "beee2dc0feef1cfe84f1aa6fc980e104b2e47a74",
              "versionType": "git"
            }
          ]
        }
      ],
      "credits": [
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          "type": "finder",
          "value": "Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc."
        },
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          "type": "coordinator",
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        }
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      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "NONE",
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            "baseScore": 8.2,
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            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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            "scope": "CHANGED",
            "userInteraction": "NONE",
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            "version": "3.1"
          },
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  "cveMetadata": {
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    "datePublished": "2026-04-23T20:59:31.492Z",
    "dateReserved": "2026-02-27T21:07:55.468Z",
    "dateUpdated": "2026-07-14T18:39:43.211Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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.

Action not permitted

ubuntu-cve-2026-28525

Vulnerability from osv_ubuntu

CVE-2026-28525 (GCVE-0-2026-28525)

Tags

Sightings

Nomenclature