The base64 decoder in the bundled libsyck indexes the 256-entry static table b64_xtable with a signed char, so any !!binary byte >= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any !!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path.
Any caller that runs Load or LoadFile on an untrusted document containing a !!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| TODDR | YAML::Syck | unaffected |
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| Vendor | Product | Confidence | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Toddr | Yaml::syck | 100% |
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Vendor Solution
Upgrade to YAML-Syck 1.47 or later.
Tracking
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Fri, 17 Jul 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
cvssV3_1
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Thu, 16 Jul 2026 23:45:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Toddr
Toddr yaml::syck |
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| Vendors & Products |
Toddr
Toddr yaml::syck |
Thu, 16 Jul 2026 22:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec. The base64 decoder in the bundled libsyck indexes the 256-entry static table b64_xtable with a signed char, so any !!binary byte >= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any !!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path. Any caller that runs Load or LoadFile on an untrusted document containing a !!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result. | |
| Title | YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec | |
| Weaknesses | CWE-125 | |
| References |
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-07-17T13:08:37.487Z
Reserved: 2026-06-23T18:02:32.994Z
Link: CVE-2026-57075
Vulnrichment
Updated: 2026-07-17T13:08:32.861Z
NVD
No data.
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-07-16T23:30:07Z