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.
Analysis and contextual insights are available on OpenCVE Cloud.
Vendor Solution
Upgrade to YAML 1.28 or later.
Vendor Workaround
For deployments that cannot upgrade to YAML 1.28, set $YAML::LoadBlessed = 0 before loading untrusted input. The option exists from YAML 1.25 and gates glob loading too.
Tracking
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Tue, 06 Oct 2026 21:30:00 +0000
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Ingydotnet
Ingydotnet yaml |
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Ingydotnet
Ingydotnet yaml |
Tue, 06 Oct 2026 17:30:00 +0000
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cvssV3_1
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ssvc
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Mon, 05 Oct 2026 19:30:00 +0000
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Mon, 05 Oct 2026 12:15:00 +0000
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threat_severity
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cvssV3_1
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Mon, 05 Oct 2026 07:00:00 +0000
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| Description | 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. 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. | |
| Title | 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 | |
| Weaknesses | CWE-502 CWE-914 |
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| References |
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Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-10-06T16:58:19.261Z
Reserved: 2026-09-21T21:17:21.642Z
Link: CVE-2019-25777
Updated: 2026-10-06T16:58:01.220Z
Status : Deferred
Published: 2026-10-05T07:16:29.557
Modified: 2026-10-06T17:17:09.893
Link: CVE-2019-25777
OpenCVE Enrichment
Updated: 2026-10-07T07:15:08Z