CVE-2026-86469 (GCVE-0-2026-86469)

Vulnerability from cvelistv5 – Published: 2026-09-07 16:00 – Updated: 2026-09-08 12:46
VLAI
Title
Glib2: toctou symlink race in `g_file_create_replace_destination` fallback path
Summary
A flaw was found in GLib2. When g_file_replace() is used with G_FILE_CREATE_REPLACE_DESTINATION and creating the .goutputstream-XXXXXX temporary file fails, the library unlinks the destination and recreates it without exclusive creation or symlink protection. A local attacker who can write to the destination directory can win that race and redirect the write to another file.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 12:46 UTC
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Date Public
2026-09-07 14:47
Show details on NVD website

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                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L",
                "version": "3.1"
              },
              "format": "CVSS"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-59",
                  "description": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-07T16:00:13.925Z",
            "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
            "shortName": "redhat"
          },
          "references": [
            {
              "tags": [
                "vdb-entry",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2026-86469"
            },
            {
              "name": "RHBZ#2473839",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2473839"
            },
            {
              "url": "https://gitlab.gnome.org/GNOME/glib/-/blob/main/gio/glocalfileoutputstream.c"
            },
            {
              "url": "https://gitlab.gnome.org/GNOME/glib/-/work_items/4044"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-05-11T20:27:44.000Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-09-07T14:47:36.294Z",
              "value": "Made public."
            }
          ],
          "title": "Glib2: toctou symlink race in `g_file_create_replace_destination` fallback path",
          "workarounds": [
            {
              "lang": "en",
              "value": "Do not use g_file_replace(..., G_FILE_CREATE_REPLACE_DESTINATION) on paths in directories writable by less-privileged users."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-86469",
        "datePublished": "2026-09-07T16:00:13.925Z",
        "dateReserved": "2026-09-07T14:38:45.692Z",
        "dateUpdated": "2026-09-07T16:00:13.925Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.

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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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