RUSTSEC-2026-0305

Vulnerability from osv_rustsec – Published: 2026-09-23 12:00 – Updated: 2026-09-23 07:46 – Source website
VLAI
Summary
Use-after-free when XML includes have duplicated entities
Details

Librsvg uses libxml2, a C library, to parse XML. When librsvg parses an SVG document which has a nested Xinclude, an XML entity declaration with a duplicate name as an existing one can cause a use-after-free error.

While libxml2 is expanding an internal entity, a recursive XInclude can parse another document that declares an entity with the same name. Both parses use the same XmlState entity map on the librsvg side. entity_insert() replaces the first entry, whose Drop implementation calls xmlFreeNode(). The outer xmlCtxtParseEntity() then keeps using the freed 144-byte xmlEntity.

The included parse should not free an entity that the outer parser is still using.

The fix is in commit 8a1b0cd319e9af2d1e9cf878081dd77f227a0504, where librsvg will no longer free xmlEntity pointers that libxml2 is still using.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "librsvg",
        "purl": "pkg:cargo/librsvg"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "2.62.4"
            },
            {
              "introduced": "2.62.90"
            },
            {
              "fixed": "2.63.2"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Librsvg uses libxml2, a C library, to parse XML.  When librsvg parses\nan SVG document which has a nested Xinclude, an XML entity declaration\nwith a duplicate name as an existing one can cause a use-after-free error.\n\nWhile libxml2 is expanding an internal entity, a recursive XInclude\ncan parse another document that declares an entity with the same\nname. Both parses use the same `XmlState` entity\nmap on the librsvg side. `entity_insert()` replaces the first entry, whose `Drop`\nimplementation calls `xmlFreeNode()`. The outer `xmlCtxtParseEntity()`\nthen keeps using the freed 144-byte `xmlEntity`.\n\nThe included parse should not free an entity that the outer parser is still using.\n\nThe fix is in commit 8a1b0cd319e9af2d1e9cf878081dd77f227a0504, where\nlibrsvg will no longer free xmlEntity pointers that libxml2 is still\nusing.",
  "id": "RUSTSEC-2026-0305",
  "modified": "2026-09-23T07:46:24Z",
  "published": "2026-09-23T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/librsvg"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0305.html"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.gnome.org/GNOME/librsvg/-/work_items/1241"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Use-after-free when XML includes have duplicated entities"
}



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