CVE-2026-59142— EGOR Data::HashMap::Shared 缓冲区错误漏洞

Data::HashMap::Shared versions before 0.14 for Perl allow an out-of-bounds read via an unvalidated arena offset and length in shm_str_copy

Data::HashMap::Shared versions before 0.14 for Perl allow an out-of-bounds read via an unvalidated arena offset and length in shm_str_copy. The attach-time validator shm_validate_header checks the header scalars and region layout against the file size, but does not validate the array contents it then trusts. shm_str_copy does memcpy(dst, arena + off, len) with off and len read raw from the mmap'd segment and unbounded, on the each, keys, values, pop, shift, take, swap, drain and cursor paths. The get path bounds off and len separately and is not affected. A local peer that can write the backing file can leave the header valid while poisoning a record's offset and length, so iterating or draining the map copies a file-controlled offset and length out of the arena, reading adjacent memory or crashing the process.

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跨界内存读

EGOR Data::HashMap::Shared 缓冲区错误漏洞

EGOR Data::HashMap::Shared是EGOR个人开发者开源的一个 Perl 模块，用于多进程共享内存哈希映射，支持 LRU 淘汰和逐键 TTL。 EGOR Data::HashMap::Shared 0.14之前版本存在缓冲区错误漏洞，该漏洞源于未验证的偏移量和长度导致越界读取，通过shm_str_copy函数读取相邻内存或导致进程崩溃。

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