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Medium

GUIX binary resource loader reads past the end of a resource, because no length for it ever reaches the loader

Type: advisorySources: OSV

`gx_binres_theme_load()` and `gx_binres_font_load()` take the resource as a bare `GX_UBYTE *` with no length, and `GX_BINRES_DATA_INFO` has no field to carry one. Every read is therefore performed at an offset the file itself chose, against a buffer whose extent the loader does not know. A resource that declares more data than it contains is read past its end, and an offset stored in the file is turned into a pointer without being bounded. This is a distinct defect from GHSA-hgcj-22cg-4hfv, which was an underflowed glyph count. It needs no underflow and no wrapped multiply: a perfectly well-formed, narrow glyph range reaches it.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-92446
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 19:26 UTC · Revision 1

Source evidence

GUIX binary resource loader reads past the end of a resource, because no length for it ever reaches the loader

core-osv · Original source

Published 20 Oct 2026, 14:52 UTC

`gx_binres_theme_load()` and `gx_binres_font_load()` take the resource as a bare `GX_UBYTE *` with no length, and `GX_BINRES_DATA_INFO` has no field to carry one. Every read is therefore performed at an offset the file itself chose, against a buffer whose extent the loader does not know. A resource that declares more data than it contains is read past its end, and an offset stored in the file is turned into a pointer without being bounded. This is a distinct defect from GHSA-hgcj-22cg-4hfv, which was an underflowed glyph count. It needs no underflow and no wrapped multiply: a perfectly well-formed, narrow glyph range reaches it.

osv:CVE-2026-92446
Complete source record
{
  "id": "cc49282eb731c15183e0054e7485678f39275d8648969cd2b26d265c5318542c",
  "url": "https://osv.dev/vulnerability/CVE-2026-92446",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "GUIX binary resource loader reads past the end of a resource, because no length for it ever reaches the loader",
    "summary": "`gx_binres_theme_load()` and `gx_binres_font_load()` take the resource as a bare `GX_UBYTE *` with no length, and `GX_BINRES_DATA_INFO` has no field to carry one. Every read is therefore performed at an offset the file itself chose, against a buffer whose extent the loader does not know. A resource that declares more data than it contains is read past its end, and an offset stored in the file is turned into a pointer without being bounded. This is a distinct defect from GHSA-hgcj-22cg-4hfv, which was an underflowed glyph count. It needs no underflow and no wrapped multiply: a perfectly well-formed, narrow glyph range reaches it.",
    "evidence": "osv:CVE-2026-92446",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-92446",
      "aliases": [
        "CVE-2026-92446",
        "GHSA-m779-jvp3-pmqr"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/eclipse-threadx/guix",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "52c1bb406843eb556d26dc28c65b13434f64e0ef"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "6.5.1.202602a"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v6.4.1_rel",
            "v6.5.1.202602a_rel",
            "v6.5.1.202602_rel",
            "v6.4.5.202504_rel",
            "v6.4.3.202503_rel",
            "v6.4.2_rel",
            "v6.4.0_rel",
            "v6.3.0_rel",
            "v6.2.1_rel",
            "v6.2.0_rel",
            "v6.1.12_rel",
            "v6.1.11_rel",
            "v6.1.10_rel",
            "v6.1.9_rel",
            "v6.1.8_rel",
            "v6.1.7_rel",
            "v6.1.6_rel",
            "v6.1.5_rel",
            "v6.1.4_rel",
            "v6.1.3_rel",
            "v6.1_rel",
            "v6.0.2_rel",
            "v6.0.1_rel",
            "v6.0_rel"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92446.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.515539995Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92446.json",
        "https://github.com/eclipse-threadx/guix/security/advisories/GHSA-m779-jvp3-pmqr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92446"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "eclipse",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92446.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-92446",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498687,
  "published_at": "2026-10-20T14:52:45.765+00:00"
}