CVE-2026-57075— toddr YAML::Syck 缓冲区错误漏洞

YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec

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.

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跨界内存读

toddr YAML::Syck 缓冲区错误漏洞

toddr YAML::Syck是toddr个人开发者的Perl语言模块,用于解析和生成YAML格式数据。 toddr YAML::Syck 1.47之前版本存在缓冲区错误漏洞，该漏洞源于syck_base64dec中使用有符号字符索引查找表导致越界读取，可能触发读取操作并在解码结果中暴露数据。

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