Vulnerability-Lookup

GHSA-FC8R-XMG7-V58H

Vulnerability from github – Published: 2026-09-29 18:31 – Updated: 2026-10-15 18:31

Details

A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.

Severity

8.6 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-102557"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-29T17:17:06Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.",
  "id": "GHSA-fc8r-xmg7-v58h",
  "modified": "2026-10-15T18:31:39Z",
  "published": "2026-09-29T18:31:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102557"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:83384"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:83618"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-102557"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543231"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-102557 (GCVE-0-2026-102557)

Vulnerability from cvelistv5 – Published: 2026-09-29 16:11 – Updated: 2026-10-15 16:43

Title

Libsoup: libsoup: heap buffer overflow during websocket message reassembly

Summary

Severity

8.6 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-30 19:40 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1036 records in the last 180 days details

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:83384	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:83618	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-102557	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2543231	issue-trackingx_refsource_REDHAT

Impacted products

5 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:3.6.5-3.el10_2.20 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.72.0-16.el9_8.8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream
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

Date Public

2026-09-03 00:00

Credits

Red Hat would like to thank Hongduo Zhao for reporting this issue.

Show details on NVD website

JSON

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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-102557",
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                  {
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                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-30T19:40:49.899291Z",
                "version": "2.0.3"
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10.2"
          ],
          "defaultStatus": "affected",
          "packageName": "libsoup3",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat",
          "versions": [
            {
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              "status": "unaffected",
              "version": "0:3.6.5-3.el10_2.20",
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            }
          ]
        },
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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            "cpe:/a:redhat:enterprise_linux:9::appstream"
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          ]
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          "cpes": [
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          "defaultStatus": "unknown",
          "packageName": "libsoup",
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          "packageName": "libsoup",
          "product": "Red Hat Enterprise Linux 8",
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        {
          "lang": "en",
          "value": "To mitigate this set a conservative max-total-incoming-message-size / incoming payload limits where the API allows, and do not accept WebSocket connections from untrusted peers."
        }
      ],
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      },
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    "dateReserved": "2026-09-29T13:19:12.882Z",
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    "state": "PUBLISHED"
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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.

Vulnerability timeline

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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.
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