GHSA-HPPC-G8H3-XHP3

Vulnerability from github – Published: 2026-04-22 21:00 – Updated: 2026-04-22 21:00
VLAI?
Summary
rust-openssl: Unchecked callback length in PSK/cookie trampolines leaks adjacent memory to peer
Details

The FFI trampolines behind SslContextBuilder::set_psk_client_callback, set_psk_server_callback, set_cookie_generate_cb, and set_stateless_cookie_generate_cb forwarded the user closure's returned usize directly to OpenSSL without checking it against the &mut [u8] that was handed to the closure. This can lead to buffer overflows and other unintended consequences.

Severity ?
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "openssl"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.24"
            },
            {
              "fixed": "0.10.78"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-126",
      "CWE-130"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-22T21:00:57Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "The FFI trampolines behind `SslContextBuilder::set_psk_client_callback`, `set_psk_server_callback`, `set_cookie_generate_cb`,  and `set_stateless_cookie_generate_cb` forwarded the user closure\u0027s returned usize directly to OpenSSL without checking it against the `\u0026mut [u8]` that was handed to the closure. This can lead to buffer overflows and other unintended consequences.",
  "id": "GHSA-hppc-g8h3-xhp3",
  "modified": "2026-04-22T21:00:57Z",
  "published": "2026-04-22T21:00:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-hppc-g8h3-xhp3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/pull/2607"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/commit/1d109020d98fff2fb2e45c39a373af3dff99b24c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rust-openssl/rust-openssl"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "rust-openssl: Unchecked callback length in PSK/cookie trampolines leaks adjacent memory to peer"
}


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