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CVE-2026-78030— DBI versions before 1.653 for Perl load arbitrary modules via unvalidated dbm_type and dbm_mldbm attributes in DBD::DBM

Quick assessment

Affected
CVE-2026-78030
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是该漏洞描述的中文翻译： 漏洞描述： Perl 的 DBI 在 1.653 版本之前，由于未验证 中的 和 属性，可导致加载任意模块。 会将 和 连接属性直接传递给 函数，而未检查其值是否确实指向一个 Perl 模块。 函数会将形如文件路径的字符串视为字面文件名，而不会查询 路径列表。因此，该属性的值直接决定了 Perl 将加载并执行哪个文件。 为 属性添加的 前缀并不构成安全边界：只有 分隔符会被重写为 ，因此如果该值中包含 ，就可以“穿越”出预期的序列化器目录。此外，该值还会被赋值给 ，而 在绑定（tie）

AI Predicted 9.8 Difficulty: Easy

I. Basic Information for CVE-2026-78030

Vulnerability Information
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Vulnerability Title
DBI versions before 1.653 for Perl load arbitrary modules via unvalidated dbm_type and dbm_mldbm attributes in DBD::DBM
Source: CVE Program / CVE List V5
Vulnerability Description
DBI versions before 1.653 for Perl load arbitrary modules via unvalidated dbm_type and dbm_mldbm attributes in DBD::DBM. DBD::DBM passes the dbm_type and dbm_mldbm connect attributes to require without checking that the value names a module. require treats a path-shaped string as a literal filename and does not consult @INC, so the attribute chooses the file that Perl loads and runs. The MLDBM::Serializer:: prefix that DBD::DBM prepends to dbm_mldbm is not a boundary: only the :: separators are rewritten to /, so a value containing / traverses out of the serializer directory. The value is also assigned to $MLDBM::Serializer, which MLDBM requires the same way when it ties the table. A caller that lets an untrusted party influence either attribute, for example through a DSN fragment or a parameter that selects a storage backend, runs the file-scope code of whatever module the value names. For example, my $dsn = "dbi:DBM:f_dir=/var/db;dbm_type=../../Untrusted.pm" my $dbh = DBI->connect( $dsn ); Note that DBD::Gofer forwards connect attributes to the server side, and DBI::ProxyServer checks only that a DSN starts with a driver prefix.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部可控制的输入来选择类或代码(不安全的反射)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 1.653 -

II. Public POCs for CVE-2026-78030

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III. Intelligence Information for CVE-2026-78030

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Patches & Fixes for CVE-2026-78030 (1)

Vendor Advisories for CVE-2026-78030 (1)

IV. Related Vulnerabilities

Same weakness: CWE-470

V. Comments for CVE-2026-78030

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