Vulnerability-Lookup

UBUNTU-CVE-2026-91786 (CVE-2026-91786)

Vulnerability from osv_ubuntu – Published: 2026-09-15 11:17 – Updated: 2026-10-28 17:45 – Source website

Details

A flaw was found in GNOME Shell. When processing icons from a remote search provider via D-Bus, the system fails to validate the icon's declared dimensions against the actual data buffer size. A malicious or compromised remote search provider could exploit this by providing oversized icon dimensions, leading to an out-of-bounds read. This can cause the GNOME Shell process to crash, disrupting the user's session, and potentially disclose sensitive information from adjacent memory.

Severity

6.1 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-91786	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-91786	REPORT
	https://gitlab.gnome.org/GNOME/gnome-shell/-/merg…	REPORT
	https://gitlab.gnome.org/GNOME/gnome-shell/-/merg…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gnome-shell",
            "binary_version": "3.18.5-0ubuntu0.3+esm1"
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          {
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      },
      "package": {
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        "name": "gnome-shell",
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      },
      "ranges": [
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          "events": [
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          "type": "ECOSYSTEM"
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        "3.18.4-0ubuntu3",
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    {
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      "ecosystem_specific": {
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            "binary_name": "gnome-shell",
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      },
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        "42.9-0ubuntu2",
        "42.9-0ubuntu2.1",
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      ]
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            "binary_name": "gnome-shell",
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            "binary_name": "gnome-shell-common",
            "binary_version": "46.0-0ubuntu6~24.04.16"
          },
          {
            "binary_name": "gnome-shell-extension-prefs",
            "binary_version": "46.0-0ubuntu6~24.04.16"
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      },
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        "46.0-0ubuntu6~24.04.3",
        "46.0-0ubuntu6~24.04.4",
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        "46.0-0ubuntu6~24.04.6",
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        "46.0-0ubuntu6~24.04.11",
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        "46.0-0ubuntu6~24.04.15",
        "46.0-0ubuntu6~24.04.16"
      ]
    },
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      "ecosystem_specific": {
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            "binary_name": "gnome-shell",
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      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
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      },
      "ranges": [
        {
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          "type": "ECOSYSTEM"
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        "49.0-1ubuntu1",
        "49.1-5ubuntu1",
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        "49.2-1ubuntu2",
        "50~beta-0ubuntu3",
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        "50.0-1ubuntu1",
        "50.0-1ubuntu2",
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        "50.1-0ubuntu1.3",
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    }
  ],
  "aliases": [],
  "details": "A flaw was found in GNOME Shell. When processing icons from a remote search provider via D-Bus, the system fails to validate the icon\u0027s declared dimensions against the actual data buffer size. A malicious or compromised remote search provider could exploit this by providing oversized icon dimensions, leading to an out-of-bounds read. This can cause the GNOME Shell process to crash, disrupting the user\u0027s session, and potentially disclose sensitive information from adjacent memory.",
  "id": "UBUNTU-CVE-2026-91786",
  "modified": "2026-10-28T17:45:56Z",
  "published": "2026-09-15T11:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-91786"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-91786"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/4418"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/4417"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-91786"
  ]
}

CVE-2026-91786 (GCVE-0-2026-91786)

Vulnerability from cvelistv5 – Published: 2026-09-15 11:00 – Updated: 2026-09-15 13:52

Title

Gnome-shell: gnome-shell: out-of-bounds read in remote search icon rendering due to unvalidated icon-data buffer size

Summary

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 13:25 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1077 records in the last 180 days details

References

3 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-91786	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2533606	issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/gnome-shell/-/issu…

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
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

2026-09-15 07:10

Credits

Red Hat would like to thank Mami for reporting this issue.

Show details on NVD website

JSON

To clipboard

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                    "Technical Impact": "partial"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-15T13:25:05.872453Z",
                "version": "2.0.3"
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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

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.

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