CVE-2026-83596 (GCVE-0-2026-83596)

Vulnerability from cvelistv5 – Published: 2026-08-31 20:46 – Updated: 2026-09-30 22:56
VLAI
Title
Webkitgtk: validate the full featurelist array once in opentypeverticaldata findfeature
Summary
A flaw was found in WebKitGTK. Processing malicious web content can cause memory corruption due to improper memory handling.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 03:55 UTC
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
Impacted products
Vendor Product Version
WebKit WebKit Affected: 1.10.0 , < * (semver)
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WebKitGTK WebKitGTK Affected: 1.10.0 , < * (semver)
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:2.54.0-1.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.54.0-1.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Date Public
2026-08-31 00:00
Credits
Red Hat would like to thank Google Big Sleep for reporting this issue.
Show details on NVD website
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                "vendor-advisory",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/errata/RHSA-2026:74084"
            },
            {
              "tags": [
                "vdb-entry",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2026-83596"
            },
            {
              "url": "https://bugs.webkit.org/show_bug.cgi?id=322969"
            },
            {
              "name": "RHBZ#2526490",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526490"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-08-31T19:57:48.998Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-08-31T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Webkitgtk: validate the full featurelist array once in opentypeverticaldata findfeature",
          "workarounds": [
            {
              "lang": "en",
              "value": "Do not process or load untrusted web content with WebKitGTK.\n\nIn Red Hat Enterprise Linux 7, the following packages require WebKitGTK4: evolution-data-server, glade, gnome-boxes, gnome-initial-setup, gnome-online-accounts, gnome-shell, shotwell, sushi and yelp.\n\nThis vulnerability can only be exploited when these packages are installed in the system and being used via a graphical interface to process untrusted web content, via GNOME for example. In gnome-shell, the vulnerability can be exploited by an attacker from the local network without user interaction.\n\nTo mitigate this vulnerability, consider removing these packages. Note that some of these packages are required by GNOME, removing them will also remove GNOME and other packages, breaking functionality. However, the server can still be used via the terminal interface.\n\nAdditionally, WebKitGTK3 is not required by any package. Therefore, it can be removed without consequences or break of functionality."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-120: Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-83596",
        "datePublished": "2026-08-31T20:46:24.116Z",
        "dateReserved": "2026-08-31T20:32:52.926Z",
        "dateUpdated": "2026-09-30T22:56:32.307Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



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.