CWE-93

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        "title": "CISA ADP Vulnrichment"
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          "packageName": "ymlr",
          "packageURL": "pkg:hex/ymlr",
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              "name": "\u0027Elixir.Ymlr\u0027:document!/2"
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              "name": "\u0027Elixir.Ymlr\u0027:documents!/2"
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              "value": "\u003cp\u003eA deployment is vulnerable when the host application places attacker-controlled text in the comment position of a document, that is, as the first element of the \u003ctt\u003e{comment, data}\u003c/tt\u003e tuple passed to \u003ctt\u003eYmlr.document!/2\u003c/tt\u003e, \u003ctt\u003eYmlr.document/2\u003c/tt\u003e, \u003ctt\u003eYmlr.documents!/2\u003c/tt\u003e or \u003ctt\u003eYmlr.documents/2\u003c/tt\u003e. Callers that encode data without comments, or that use only static comment strings, are not exploitable.\u003c/p\u003e"
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          "type": "remediation developer",
          "value": "Michael Ruoss"
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              "value": "\u003cp\u003eImproper Neutralization of CRLF Sequences vulnerability in ufirstgroup ymlr (\u003ctt\u003eElixir.Ymlr\u003c/tt\u003e module) allows attackers to inject arbitrary content into generated YAML documents through document comments. \u003ctt\u003eYmlr.document!/2\u003c/tt\u003e interpolates each caller-supplied comment string into the output behind a single \u003ctt\u003e#\u003c/tt\u003e 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.\u003c/p\u003e\u003cp\u003eAn 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 \u003ctt\u003e---\u003c/tt\u003e or \u003ctt\u003e...\u003c/tt\u003e 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 \u003ctt\u003eYmlr.document/2\u003c/tt\u003e, \u003ctt\u003eYmlr.documents!/2\u003c/tt\u003e and \u003ctt\u003eYmlr.documents/2\u003c/tt\u003e, so every document encoding entry point is affected.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/ymlr.ex\u003c/tt\u003e and program routines \u003ctt\u003e\u0027Elixir.Ymlr\u0027:document!/2\u003c/tt\u003e, \u003ctt\u003e\u0027Elixir.Ymlr\u0027:documents!/2\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects ymlr from 0.0.1 before 5.1.6.\u003c/p\u003e"
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          "value": "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.\n\nAn 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.\n\nThis vulnerability is associated with program files lib/ymlr.ex and program routines \u0027Elixir.Ymlr\u0027:document!/2, \u0027Elixir.Ymlr\u0027:documents!/2.\n\nThis issue affects ymlr from 0.0.1 before 5.1.6."
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              "description": "CWE-93 Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)",
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      "title": "YAML injection via unescaped newlines in ymlr document comments",
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              "value": "\u003cp\u003eSplit any untrusted comment string on line breaks and pass the resulting list as the comment element of the \u003ctt\u003e{comment, data}\u003c/tt\u003e tuple. Ymlr prefixes every list element with its own \u003ctt\u003e#\u003c/tt\u003e marker, so no line can leave the comment context. Alternatively, reject comment strings that contain carriage return or line feed characters, or keep untrusted text out of comments entirely and place it in the encoded data instead, where the encoder quotes it.\u003c/p\u003e"
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