RUSTSEC-2026-0404

Vulnerability from osv_rustsec – Published: 2026-10-16 12:00 – Updated: 2026-11-02 09:18 – Source website
VLAI
Summary
Double free in `DCtx::try_clone`
Details

DCtx::try_clone (experimental feature, deprecated) is a plain copy of the C context. A context owning a dictionary (from load_dictionary, ref_prefix or init_using_dict) or a dictionary table (ref_ddict with RefMultipleDDicts) ended up with both copies freeing it. A context cloned mid-frame resumed on uninitialized stream state. The clone also silently lost the WindowLogMax limit.

The flaw was corrected by refusing to clone such contexts, and by carrying over the parameters the copy leaves out.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "zstd_safe::DCtx::try_clone"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "zstd-safe",
        "purl": "pkg:cargo/zstd-safe"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.4"
            },
            {
              "fixed": "7.4.0"
            },
            {
              "introduced": "8.0.0-0"
            },
            {
              "fixed": "8.2.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "`DCtx::try_clone` (`experimental` feature, deprecated) is a plain copy of the\nC context. A context owning a dictionary (from `load_dictionary`,\n`ref_prefix` or `init_using_dict`) or a dictionary table (`ref_ddict` with\n`RefMultipleDDicts`) ended up with both copies freeing it. A context cloned\nmid-frame resumed on uninitialized stream state. The clone also silently lost\nthe `WindowLogMax` limit.\n\nThe flaw was corrected by refusing to clone such contexts, and by carrying\nover the parameters the copy leaves out.",
  "id": "RUSTSEC-2026-0404",
  "modified": "2026-11-02T09:18:23Z",
  "published": "2026-10-16T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/zstd-safe"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0404.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gyscos/zstd-rs/commit/cee6529b553ec600a8e152aaca15a91598820ecf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gyscos/zstd-rs/pull/384"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Double free in `DCtx::try_clone`"
}



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