CVE-2026-57076— toddr YAML::Syck 资源管理错误漏洞

YAML::Syck versions before 1.47 for Perl allow a heap use-after-free via an anchor name reused as an anchors-table key in syck_hdlr_add_anchor

YAML::Syck versions before 1.47 for Perl allow a heap use-after-free via an anchor name reused as an anchors-table key in syck_hdlr_add_anchor. In the bundled libsyck an anchor name allocated by syck_strndup is stored both as node->anchor, freed when the node is freed, and as the key in the parser's anchors table. Freeing the node frees the shared key, and a later anchor redefinition makes st_delete compare against the freed key, so st_strcmp reads freed heap memory. Anchors are a standard YAML feature and need no special flags, so this is reached on the default Load path. Any caller that runs Load or LoadFile on an untrusted document that redefines an anchor reaches the read of freed memory.

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释放后使用

toddr YAML::Syck 资源管理错误漏洞

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之前版本存在资源管理错误漏洞，该漏洞源于锚点名称在syck_hdlr_add_anchor中作为锚点表键重用导致堆释放后重用。

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