GHSA-38XX-2HM6-VH7Q
Vulnerability from github – Published: 2026-10-05 09:31 – Updated: 2026-10-05 21:31YAML versions before 1.27_001 for Perl allow a loaded perl/glob document to replace any package variable, which can lead to arbitrary code execution.
A perl/glob document names a package and a symbol, and supplies the value assigned to it. Nothing restricts the name, so the target can be @INC or YAML's own load options.
A perl/glob document that sets $YAML::LoadCode or $YAML::UseCode turns on code loading, which is off by default, for every later Load() in the process. A perl/code document is then passed to a string eval, so an attacker who supplies two documents to separate Load() calls in one process can execute arbitrary Perl code.
{
"affected": [],
"aliases": [
"CVE-2019-25777"
],
"database_specific": {
"cwe_ids": [
"CWE-502"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-05T07:16:29Z",
"severity": null
},
"details": "YAML versions before 1.27_001 for Perl allow a loaded perl/glob document to replace any package variable, which can lead to arbitrary code execution.\n\nA perl/glob document names a package and a symbol, and supplies the value assigned to it. Nothing restricts the name, so the target can be @INC or YAML\u0027s own load options.\n\nA perl/glob document that sets $YAML::LoadCode or $YAML::UseCode turns on code loading, which is off by default, for every later Load() in the process. A perl/code document is then passed to a string eval, so an attacker who supplies two documents to separate Load() calls in one process can execute arbitrary Perl code.",
"id": "GHSA-38xx-2hm6-vh7q",
"modified": "2026-10-05T21:31:33Z",
"published": "2026-10-05T09:31:51Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-25777"
},
{
"type": "WEB",
"url": "https://github.com/ingydotnet/yaml-pm/issues/212"
},
{
"type": "WEB",
"url": "https://github.com/ingydotnet/yaml-pm/commit/bace96b5e6661d521c7c515c94a09e081c911fce.patch"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/TINITA/YAML-1.28/changes"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2026/10/05/7"
}
],
"schema_version": "1.4.0",
"severity": []
}
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