{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66293", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-07-24T14:10:01.114Z", "datePublished": "2026-11-06T10:16:42.053Z", "dateUpdated": "2026-11-06T10:16:42.053Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:qcam:saxy:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Saxy'", "'Elixir.Saxy.Encoder'", "'Elixir.Saxy.XML'"], "packageName": "saxy", "packageURL": "pkg:hex/saxy", "product": "saxy", "programFiles": ["lib/saxy.ex", "lib/saxy/encoder.ex", "lib/saxy/xml.ex"], "programRoutines": [{"name": "'Elixir.Saxy':encode!/2"}, {"name": "'Elixir.Saxy':encode_to_iodata!/2"}, {"name": "'Elixir.Saxy.XML':comment/1"}], "repo": "https://github.com/qcam/saxy", "vendor": "qcam", "versions": [{"lessThan": "1.7.0", "status": "affected", "version": "0.7.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:qcam:saxy:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Saxy'", "'Elixir.Saxy.Encoder'", "'Elixir.Saxy.XML'"], "packageName": "qcam/saxy", "packageURL": "pkg:github/qcam/saxy", "product": "saxy", "programFiles": ["lib/saxy.ex", "lib/saxy/encoder.ex", "lib/saxy/xml.ex"], "programRoutines": [{"name": "'Elixir.Saxy':encode!/2"}, {"name": "'Elixir.Saxy':encode_to_iodata!/2"}, {"name": "'Elixir.Saxy.XML':comment/1"}], "repo": "https://github.com/qcam/saxy", "vendor": "qcam", "versions": [{"lessThan": "6d12ee12b9e32e86ef598b3f3cafccd1840b2f41", "status": "affected", "version": "7266632e9407842f28ffac254c56dc41210a5690", "versionType": "git"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Only applications that place untrusted text into an XML comment node are affected. The untrusted value must reach <code>Saxy.XML.comment/1</code> or a raw <code>{:comment, text}</code> simple form child that is then serialized with <code>Saxy.encode!/2</code> or <code>Saxy.encode_to_iodata!/2</code>. Documents that are only parsed by Saxy never reach the encoder and are not a vector.</p>"}, {"base64": false, "type": "text/markdown", "value": "Only applications that place untrusted text into an XML comment node are affected. The untrusted value must reach `Saxy.XML.comment/1` or a raw `{:comment, text}` simple form child that is then serialized with `Saxy.encode!/2` or `Saxy.encode_to_iodata!/2`. Documents that are only parsed by Saxy never reach the encoder and are not a vector."}], "value": "Only applications that place untrusted text into an XML comment node are affected. The untrusted value must reach Saxy.XML.comment/1 or a raw {:comment, text} simple form child that is then serialized with Saxy.encode!/2 or Saxy.encode_to_iodata!/2. Documents that are only parsed by Saxy never reach the encoder and are not a vector."}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:qcam:saxy:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.7.0", "versionStartIncluding": "0.7.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Peter Ullrich"}, {"lang": "en", "type": "reporter", "value": "Peter Ullrich"}, {"lang": "en", "type": "remediation developer", "value": "Peter Ullrich"}, {"lang": "en", "type": "remediation reviewer", "value": "C\u1ea9m Hu\u1ef3nh"}, {"lang": "en", "type": "analyst", "value": "Jonatan M\u00e4nnchen / EEF"}, {"lang": "en", "type": "coordinator", "value": "Peter Ullrich"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>XML injection in the encoder of Saxy. <code>Saxy.Encoder</code> does not neutralize the <code>--</code> sequence in XML comment content: <code>escape_comment/2</code> returns the comment binary unchanged in every clause and only appends a space when the comment ends in a single <code>-</code>, so neither an interior <code>--</code> nor a full <code>--&gt;</code> is escaped or rejected before the encoder wraps the content in the <code>&lt;!--</code> and <code>--&gt;</code> delimiters.</p>\n<p>When an application serializes attacker-controlled text as a comment, through <code>Saxy.XML.comment/1</code> or a raw <code>{:comment, text}</code> simple form child, the attacker can close the comment early with <code>--&gt;</code> and inject arbitrary sibling markup into the serialized document. A downstream parser then sees elements, attributes, and text that the application never built. Where the document is rendered as HTML or SVG, the injected markup executes as stored cross-site scripting; where it is consumed by another XML processor, the attacker can forge data that the producing application never emitted. Documents that Saxy only parses are not a vector.</p>\n<p>This issue affects saxy: from 0.7.0 before 1.7.0.</p>"}, {"base64": false, "type": "text/markdown", "value": "XML injection in the encoder of Saxy. `Saxy.Encoder` does not neutralize the `--` sequence in XML comment content: `escape_comment/2` returns the comment binary unchanged in every clause and only appends a space when the comment ends in a single `-`, so neither an interior `--` nor a full `-->` is escaped or rejected before the encoder wraps the content in the `<!--` and `-->` delimiters.\n\nWhen an application serializes attacker-controlled text as a comment, through `Saxy.XML.comment/1` or a raw `{:comment, text}` simple form child, the attacker can close the comment early with `-->` and inject arbitrary sibling markup into the serialized document. A downstream parser then sees elements, attributes, and text that the application never built. Where the document is rendered as HTML or SVG, the injected markup executes as stored cross-site scripting; where it is consumed by another XML processor, the attacker can forge data that the producing application never emitted. Documents that Saxy only parses are not a vector.\n\nThis issue affects saxy: from 0.7.0 before 1.7.0."}], "value": "XML injection in the encoder of Saxy. Saxy.Encoder does not neutralize the -- sequence in XML comment content: escape_comment/2 returns the comment binary unchanged in every clause and only appends a space when the comment ends in a single -, so neither an interior -- nor a full --> is escaped or rejected before the encoder wraps the content in the <!-- and --> delimiters.\n\nWhen an application serializes attacker-controlled text as a comment, through Saxy.XML.comment/1 or a raw {:comment, text} simple form child, the attacker can close the comment early with --> and inject arbitrary sibling markup into the serialized document. A downstream parser then sees elements, attributes, and text that the application never built. Where the document is rendered as HTML or SVG, the injected markup executes as stored cross-site scripting; where it is consumed by another XML processor, the attacker can forge data that the producing application never emitted. Documents that Saxy only parses are not a vector.\n\nThis issue affects saxy: from 0.7.0 before 1.7.0."}], "impacts": [{"capecId": "CAPEC-250", "descriptions": [{"lang": "en", "value": "CAPEC-250 XML Injection"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "baseScore": 2.1, "baseSeverity": "LOW", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-91", "description": "CWE-91 XML Injection", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-11-06T10:16:42.053Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/qcam/saxy/security/advisories/GHSA-mm3m-xwmf-v698"}, {"name": "EEF CNA record for CVE-2026-66293", "tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-66293.html"}, {"name": "OSV record EEF-CVE-2026-66293", "tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-66293"}, {"name": "Introducing commit 7266632 in qcam/saxy", "tags": ["related"], "url": "https://github.com/qcam/saxy/commit/7266632e9407842f28ffac254c56dc41210a5690"}, {"name": "Fix commit 6d12ee1 in qcam/saxy", "tags": ["patch"], "url": "https://github.com/qcam/saxy/commit/6d12ee12b9e32e86ef598b3f3cafccd1840b2f41"}], "source": {"discovery": "EXTERNAL"}, "title": "XML comment injection in Saxy encoder via unescaped double hyphen", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Reject or rewrite the <code>--</code> sequence in untrusted text before passing it to <code>Saxy.XML.comment/1</code>, for example by replacing <code>--</code> with <code>- -</code>.</p>\n<p>Alternatively, stop emitting untrusted data as XML comments. Comments carry no semantic payload for consumers, so the text can usually be moved into an element or a CDATA section instead.</p>"}, {"base64": false, "type": "text/markdown", "value": "Reject or rewrite the `--` sequence in untrusted text before passing it to `Saxy.XML.comment/1`, for example by replacing `--` with `- -`.\n\nAlternatively, stop emitting untrusted data as XML comments. Comments carry no semantic payload for consumers, so the text can usually be moved into an element or a CDATA section instead."}], "value": "Reject or rewrite the -- sequence in untrusted text before passing it to Saxy.XML.comment/1, for example by replacing -- with - -.\n\nAlternatively, stop emitting untrusted data as XML comments. Comments carry no semantic payload for consumers, so the text can usually be moved into an element or a CDATA section instead."}]}}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:qcam:saxy:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Saxy'", "'Elixir.Saxy.Encoder'", "'Elixir.Saxy.XML'"], "packageName": "saxy", "packageURL": "pkg:hex/saxy", "product": "saxy", "programFiles": ["lib/saxy.ex", "lib/saxy/encoder.ex", "lib/saxy/xml.ex"], "programRoutines": [{"name": "'Elixir.Saxy':encode!/2"}, {"name": "'Elixir.Saxy':encode_to_iodata!/2"}, {"name": "'Elixir.Saxy.XML':comment/1"}], "repo": "https://github.com/qcam/saxy", "vendor": "qcam", "versions": [{"lessThan": "1.7.0", "status": "affected", "version": "0.7.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:qcam:saxy:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Saxy'", "'Elixir.Saxy.Encoder'", "'Elixir.Saxy.XML'"], "packageName": "qcam/saxy", "packageURL": "pkg:github/qcam/saxy", "product": "saxy", "programFiles": ["lib/saxy.ex", "lib/saxy/encoder.ex", "lib/saxy/xml.ex"], "programRoutines": [{"name": "'Elixir.Saxy':encode!/2"}, {"name": "'Elixir.Saxy':encode_to_iodata!/2"}, {"name": "'Elixir.Saxy.XML':comment/1"}], "repo": "https://github.com/qcam/saxy", "vendor": "qcam", "versions": [{"lessThan": "6d12ee12b9e32e86ef598b3f3cafccd1840b2f41", "status": "affected", "version": "7266632e9407842f28ffac254c56dc41210a5690", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "XML injection in the encoder of Saxy. Saxy.Encoder does not neutralize the -- sequence in XML comment content: escape_comment/2 returns the comment binary unchanged in every clause and only appends a space when the comment ends in a single -, so neither an interior -- nor a full --> is escaped or rejected before the encoder wraps the content in the <!-- and --> delimiters.\n\nWhen an application serializes attacker-controlled text as a comment, through Saxy.XML.comment/1 or a raw {:comment, text} simple form child, the attacker can close the comment early with --> and inject arbitrary sibling markup into the serialized document. A downstream parser then sees elements, attributes, and text that the application never built. Where the document is rendered as HTML or SVG, the injected markup executes as stored cross-site scripting; where it is consumed by another XML processor, the attacker can forge data that the producing application never emitted. Documents that Saxy only parses are not a vector.\n\nThis issue affects saxy: from 0.7.0 before 1.7.0."}], "id": "CVE-2026-66293", "lastModified": "2026-11-06T11:17:16.057", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.1, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}, "published": "2026-11-06T11:17:16.057", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-66293.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/qcam/saxy/commit/6d12ee12b9e32e86ef598b3f3cafccd1840b2f41"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/qcam/saxy/commit/7266632e9407842f28ffac254c56dc41210a5690"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/qcam/saxy/security/advisories/GHSA-mm3m-xwmf-v698"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-66293"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-91"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{}