CVE-2026-65636— UFirst Group ymlr 输入验证错误漏洞

YAML injection via unescaped newlines in ymlr document comments

Improper Neutralization of CRLF Sequences vulnerability in ufirstgroup ymlr (Elixir.Ymlr module) allows attackers to inject arbitrary content into generated YAML documents through document comments. Ymlr.document!/2 interpolates each caller-supplied comment string into the output behind a single # prefix without validating it or escaping line breaks. Because a YAML comment is terminated by a line break, the first carriage return or line feed in the comment string ends the comment context and everything after it is emitted at column 0 of the document body. An attacker who controls text that the host application passes as a comment can forge top-level mapping keys, override values the application itself set, and emit --- or ... markers that split the output into additional documents. Downstream consumers of the generated YAML, such as configuration loaders, deployment manifests, CI pipelines and data importers, parse the injected content as legitimate data. The same clause backs Ymlr.document/2, Ymlr.documents!/2 and Ymlr.documents/2, so every document encoding entry point is affected. This vulnerability is associated with program files lib/ymlr.ex and program routines 'Elixir.Ymlr':document!/2, 'Elixir.Ymlr':documents!/2. This issue affects ymlr from 0.0.1 before 5.1.6.

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

对CRLF序列的转义处理不恰当(CRLF注入)

UFirst Group ymlr 输入验证错误漏洞

UFirst Group ymlr是UFirst Group组织的一个YAML解析工具。 UFirst Group ymlr 0.0.1至5.1.6之前版本存在输入验证错误漏洞，该漏洞源于Ymlr.document!/2函数未正确中和CRLF序列，未验证或转义注释字符串中的换行符，可能导致攻击者通过文档注释向生成的YAML文档中注入任意内容。

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