{"id":"CVE-2026-29074","aliases":["CLSA-2026-1779324470","DEBIAN-CVE-2026-29074","EUVD-2026-10022","GHSA-xpqw-6gx7-v673","RHSA-2026:13512","RHSA-2026:6277","ROOT-APP-NPM-CVE-2026-29074","SUSE-SU-2026:2005-1","SUSE-SU-2026:2019-1","openSUSE-SU-2026:12070-1"],"status":"published","title":"SVGO: DoS through entity expansion in DOCTYPE (Billion Laughs)","description":"SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 2.1.0 to before version 2.8.1, from version 3.0.0 to before version 3.3.3, and before version 4.0.1, SVGO accepts XML with custom entities, without guards against entity expansion or recursion. This can result in a small XML file (811 bytes) stalling the application and even crashing the Node.js process with JavaScript heap out of memory. 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SA-752w-5fwx-jx9f","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-39373","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-39373","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39373","tags":["advisory"]},{"url":"https://github.com/latchset/jwcrypto/security/advisories/GHSA-fjrm-76x2-c4q4","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2439170","tags":["report"]},{"url":"https://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.6/html/release_notes/patch_releases","tags":["article"]},{"url":"https://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.6#Upgrade","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2434432","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2437111","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2438237","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2442922","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_6277.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-61726","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-61726","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-61726","tags":["advisory"]},{"url":"https://go.dev/cl/736712","tags":["article"]},{"url":"https://go.dev/issue/77101","tags":["article"]},{"url":"https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc","tags":["article"]},{"url":"https://pkg.go.dev/vuln/GO-2026-4341","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-68121","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-68121","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68121","tags":["advisory"]},{"url":"https://go.dev/cl/737700","tags":["article"]},{"url":"https://go.dev/issue/77217","tags":["article"]},{"url":"https://groups.google.com/g/golang-announce/c/K09ubi9FQFk","tags":["article"]},{"url":"https://pkg.go.dev/vuln/GO-2026-4337","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-25639","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-25639","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25639","tags":["advisory"]},{"url":"https://github.com/axios/axios/commit/28c721588c7a77e7503d0a434e016f852c597b57","tags":["article"]},{"url":"https://github.com/axios/axios/releases/tag/v1.13.5","tags":["article"]},{"url":"https://github.com/axios/axios/security/advisories/GHSA-43fc-jf86-j433","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-25990","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-25990","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25990","tags":["advisory"]},{"url":"https://github.com/python-pillow/Pillow/commit/9000313cc5d4a31bdcdd6d7f0781101abab553aa","tags":["article"]},{"url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-cfh3-3jmp-rvhc","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-27904","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-27904","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27904","tags":["advisory"]},{"url":"https://github.com/isaacs/minimatch/security/advisories/GHSA-23c5-xmqv-rm74","tags":["article"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262005-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1256521","tags":["report"]},{"url":"https://bugzilla.suse.com/1259290","tags":["report"]},{"url":"https://bugzilla.suse.com/1265040","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-0775","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-29074","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-4802","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262019-1/","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2025-0914","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-12143","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-14257","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-17535","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-18348","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-18636","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-18638","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-18639","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-18860","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-27601","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-41650","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE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DoS through entity expansion in DOCTYPE (Billion Laughs)","description":"SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 2.1.0 to before version 2.8.1, from version 3.0.0 to before version 3.3.3, and before version 4.0.1, SVGO accepts XML with custom entities, without guards against entity expansion or recursion. This can result in a small XML file (811 bytes) stalling the application and even crashing the Node.js process with JavaScript heap out of memory. This issue has been patched in versions 2.8.1, 3.3.3, and 4.0.1.","status":"published","published":"2026-03-06T07:23:05.716Z","modified":"2026-09-10T12:04:59.38Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-776","CWE-776"],"updated_at":"2026-11-02T14:19:56.284359Z"}],"euvd":[{"id":"EUVD-2026-10022","description":"SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 2.1.0 to before version 2.8.1, from version 3.0.0 to before version 3.3.3, and before version 4.0.1, SVGO accepts XML with custom entities, without guards against entity expansion or recursion. This can result in a small XML file (811 bytes) stalling the application and even crashing the Node.js process with JavaScript heap out of memory. This issue has been patched in versions 2.8.1, 3.3.3, and 4.0.1.","status":"published","published":"2026-03-06T07:23:05Z","modified":"2026-09-10T12:04:59Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:28:25.275283Z"}],"ghsa":[{"id":"GHSA-xpqw-6gx7-v673","title":"SVGO DoS through entity expansion in DOCTYPE (Billion Laughs)","description":"### Summary\n\nSVGO accepts XML with custom entities, without guards against entity expansion or recursion. This can result in a small XML file (811 bytes) stalling the application and even crashing the Node.js process with `JavaScript heap out of memory`.\n\n### Details\n\nThe upstream XML parser ([sax](https://www.npmjs.com/package/sax)) doesn't interpret custom XML entities by default. We pattern matched custom XML entities from the `DOCTYPE`, inserting them into `parser.ENTITIES`, and enabled `unparsedEntities`. This gives us the desired behavior of supporting SVGs with entities declared in the `DOCTYPE`.\n\nHowever, entities can reference other entities, which can enable small SVGs to explode exponentially when we try to parse them.\n\n#### Proof of Concept\n\n```js\nimport { optimize } from 'svgo';\n\n/** Presume that this string was obtained in some other way, such as network. */\nconst original = `\n  \u003c?xml version=\"1.0\"?\u003e\n  \u003c!DOCTYPE lolz [\n  \u003c!ENTITY lol \"lol\"\u003e\n  \u003c!ELEMENT lolz (#PCDATA)\u003e\n  \u003c!ENTITY lol1 \"\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\"\u003e\n  \u003c!ENTITY lol2 \"\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\"\u003e\n  \u003c!ENTITY lol3 \"\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\"\u003e\n  \u003c!ENTITY lol4 \"\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\"\u003e\n  \u003c!ENTITY lol5 \"\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\"\u003e\n  \u003c!ENTITY lol6 \"\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\"\u003e\n  \u003c!ENTITY lol7 \"\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\"\u003e\n  \u003c!ENTITY lol8 \"\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\"\u003e\n  \u003c!ENTITY lol9 \"\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\"\u003e\n  ]\u003e\n  \u003clolz\u003e\u0026lol9;\u003c/lolz\u003e\n`;\n\noptimize(original);\n```\n\n### Impact\n\nIf SVGO is run on untrusted input (i.e., user uploaded to server-side application), then the untrusted SVG can effectively stall or crash the application with an SVG \u003c 1 KB in size.\n\nIt's unlikely to impact users who just use SVGO locally on their own SVGs or in build pipelines.\n\n### Patches\n\nSVGO has patched v4.0.1, v3.3.3, and v2.8.1! However, it's strongly recommended to upgrade to v4 regardless, as previous versions are not officially supported anymore.\n\n### Workarounds\n\n#### == 4.0.0\n\nFor v4, users do not specifically have to upgrade SVGO, though it is recommended to do so. A package manager can be used to upgrade sax recursively:\n\nFor example:\n\n```sh\nyarn up -R sax\n```\n\nNew options were introduced upstream which makes the way SVGO parses SVGs safe by default.\n\n#### \u003e= 2.1.0, \u003c= 3.3.2\n\nUsers of v3 and v2 will have to take manual action. If users can't upgrade, they may be able to work around this as long as the project doesn't require support for custom XML entities, though it's not a simple flag.\n\nParse the DOCTYPE directly and check for the presence of custom entities. If entities are present, throw/escape before passing them to SVGO.\n\n```diff\n+ import SAX from 'sax';\n  import { optimize } from 'svgo';\n\n- const original =`\n+ let original = `\n    \u003c?xml version=\"1.0\"?\u003e\n    \u003c!DOCTYPE lolz [\n    \u003c!ENTITY lol \"lol\"\u003e\n    \u003c!ELEMENT lolz (#PCDATA)\u003e\n    \u003c!ENTITY lol1 \"\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\"\u003e\n    \u003c!ENTITY lol2 \"\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\"\u003e\n    \u003c!ENTITY lol3 \"\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\"\u003e\n    \u003c!ENTITY lol4 \"\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\"\u003e\n    \u003c!ENTITY lol5 \"\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\"\u003e\n    \u003c!ENTITY lol6 \"\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\"\u003e\n    \u003c!ENTITY lol7 \"\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\"\u003e\n    \u003c!ENTITY lol8 \"\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\"\u003e\n    \u003c!ENTITY lol9 \"\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\"\u003e\n    ]\u003e\n    \u003clolz\u003e\u0026lol9;\u003c/lolz\u003e\n  `;\n\n+ const parser = SAX.parser();\n+ /** @param {string} doctype */\n+ parser.ondoctype = (doctype) =\u003e {\n+   original = original.replace(doctype, '');\n+ }\n+ parser.write(original);\n\n  optimize(original);\n```\n\n### Resources\n\n* [Wikipedia: Billion laughs attack](https://en.wikipedia.org/wiki/Billion_laughs_attack)","status":"published","published":"2026-03-04T22:59:28Z","modified":"2026-03-06T21:58:10Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-776"],"updated_at":"2026-11-02T14:39:32.329372Z"}],"nvd":[{"id":"CVE-2026-29074","description":"SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 2.1.0 to before version 2.8.1, from version 3.0.0 to before version 3.3.3, and before version 4.0.1, SVGO accepts XML with custom entities, without guards against entity expansion or recursion. This can result in a small XML file (811 bytes) stalling the application and even crashing the Node.js process with JavaScript heap out of memory. This issue has been patched in versions 2.8.1, 3.3.3, and 4.0.1.","status":"published","published":"2026-03-06T08:16:26.92Z","modified":"2026-09-10T13:18:03.533Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-776"],"updated_at":"2026-11-02T14:12:08.279852Z"}],"osv":[{"id":"CVE-2026-29074","title":"SVGO: DoS through entity expansion in DOCTYPE (Billion Laughs)","description":"SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 2.1.0 to before version 2.8.1, from version 3.0.0 to before version 3.3.3, and before version 4.0.1, SVGO accepts XML with custom entities, without guards against entity expansion or recursion. This can result in a small XML file (811 bytes) stalling the application and even crashing the Node.js process with JavaScript heap out of memory. This issue has been patched in versions 2.8.1, 3.3.3, and 4.0.1.","status":"published","published":"2026-03-06T07:23:05.716Z","modified":"2026-10-28T02:30:56.778114899Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-776"],"updated_at":"2026-11-02T15:45:00.530889Z"},{"id":"DEBIAN-CVE-2026-29074","description":"SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 2.1.0 to before version 2.8.1, from version 3.0.0 to before version 3.3.3, and before version 4.0.1, SVGO accepts XML with custom entities, without guards against entity expansion or recursion. This can result in a small XML file (811 bytes) stalling the application and even crashing the Node.js process with JavaScript heap out of memory. This issue has been patched in versions 2.8.1, 3.3.3, and 4.0.1.","status":"published","published":"2026-03-06T08:16:26.92Z","modified":"2026-10-13T11:00:08.460781254Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:53.877573Z"},{"id":"GHSA-xpqw-6gx7-v673","title":"SVGO DoS through entity expansion in DOCTYPE (Billion Laughs)","description":"### Summary\n\nSVGO accepts XML with custom entities, without guards against entity expansion or recursion. This can result in a small XML file (811 bytes) stalling the application and even crashing the Node.js process with `JavaScript heap out of memory`.\n\n### Details\n\nThe upstream XML parser ([sax](https://www.npmjs.com/package/sax)) doesn't interpret custom XML entities by default. We pattern matched custom XML entities from the `DOCTYPE`, inserting them into `parser.ENTITIES`, and enabled `unparsedEntities`. This gives us the desired behavior of supporting SVGs with entities declared in the `DOCTYPE`.\n\nHowever, entities can reference other entities, which can enable small SVGs to explode exponentially when we try to parse them.\n\n#### Proof of Concept\n\n```js\nimport { optimize } from 'svgo';\n\n/** Presume that this string was obtained in some other way, such as network. */\nconst original = `\n  \u003c?xml version=\"1.0\"?\u003e\n  \u003c!DOCTYPE lolz [\n  \u003c!ENTITY lol \"lol\"\u003e\n  \u003c!ELEMENT lolz (#PCDATA)\u003e\n  \u003c!ENTITY lol1 \"\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\"\u003e\n  \u003c!ENTITY lol2 \"\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\"\u003e\n  \u003c!ENTITY lol3 \"\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\"\u003e\n  \u003c!ENTITY lol4 \"\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\"\u003e\n  \u003c!ENTITY lol5 \"\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\"\u003e\n  \u003c!ENTITY lol6 \"\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\"\u003e\n  \u003c!ENTITY lol7 \"\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\"\u003e\n  \u003c!ENTITY lol8 \"\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\"\u003e\n  \u003c!ENTITY lol9 \"\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\"\u003e\n  ]\u003e\n  \u003clolz\u003e\u0026lol9;\u003c/lolz\u003e\n`;\n\noptimize(original);\n```\n\n### Impact\n\nIf SVGO is run on untrusted input (i.e., user uploaded to server-side application), then the untrusted SVG can effectively stall or crash the application with an SVG \u003c 1 KB in size.\n\nIt's unlikely to impact users who just use SVGO locally on their own SVGs or in build pipelines.\n\n### Patches\n\nSVGO has patched v4.0.1, v3.3.3, and v2.8.1! However, it's strongly recommended to upgrade to v4 regardless, as previous versions are not officially supported anymore.\n\n### Workarounds\n\n#### == 4.0.0\n\nFor v4, users do not specifically have to upgrade SVGO, though it is recommended to do so. A package manager can be used to upgrade sax recursively:\n\nFor example:\n\n```sh\nyarn up -R sax\n```\n\nNew options were introduced upstream which makes the way SVGO parses SVGs safe by default.\n\n#### \u003e= 2.1.0, \u003c= 3.3.2\n\nUsers of v3 and v2 will have to take manual action. If users can't upgrade, they may be able to work around this as long as the project doesn't require support for custom XML entities, though it's not a simple flag.\n\nParse the DOCTYPE directly and check for the presence of custom entities. If entities are present, throw/escape before passing them to SVGO.\n\n```diff\n+ import SAX from 'sax';\n  import { optimize } from 'svgo';\n\n- const original =`\n+ let original = `\n    \u003c?xml version=\"1.0\"?\u003e\n    \u003c!DOCTYPE lolz [\n    \u003c!ENTITY lol \"lol\"\u003e\n    \u003c!ELEMENT lolz (#PCDATA)\u003e\n    \u003c!ENTITY lol1 \"\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\u0026lol;\"\u003e\n    \u003c!ENTITY lol2 \"\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\u0026lol1;\"\u003e\n    \u003c!ENTITY lol3 \"\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\u0026lol2;\"\u003e\n    \u003c!ENTITY lol4 \"\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\u0026lol3;\"\u003e\n    \u003c!ENTITY lol5 \"\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\u0026lol4;\"\u003e\n    \u003c!ENTITY lol6 \"\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\u0026lol5;\"\u003e\n    \u003c!ENTITY lol7 \"\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\u0026lol6;\"\u003e\n    \u003c!ENTITY lol8 \"\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\u0026lol7;\"\u003e\n    \u003c!ENTITY lol9 \"\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\u0026lol8;\"\u003e\n    ]\u003e\n    \u003clolz\u003e\u0026lol9;\u003c/lolz\u003e\n  `;\n\n+ const parser = SAX.parser();\n+ /** @param {string} doctype */\n+ parser.ondoctype = (doctype) =\u003e {\n+   original = original.replace(doctype, '');\n+ }\n+ parser.write(original);\n\n  optimize(original);\n```\n\n### Resources\n\n* [Wikipedia: Billion laughs attack](https://en.wikipedia.org/wiki/Billion_laughs_attack)","status":"published","published":"2026-03-04T22:59:28Z","modified":"2026-09-10T03:50:41.875487187Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-776"],"updated_at":"2026-11-02T15:47:00.198893Z"},{"id":"RHSA-2026:13512","title":"Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update","status":"published","published":"2026-05-05T10:11:48Z","modified":"2026-10-20T10:04:50Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:53:18.066978Z"},{"id":"RHSA-2026:6277","title":"Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update","status":"published","published":"2026-04-01T10:07:53Z","modified":"2026-10-20T10:12:44Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"id":"CLSA-2026-1779324470","title":"TuxCare security update for svgo (1 CVE)","description":"TuxCare rebuilt svgo to address 1 CVE. Fixed in 2.8.0-tuxcare.1.","status":"published","published":"2026-08-04T14:52:33Z","modified":"2026-10-15T09:48:03.611874556Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"openSUSE-SU-2026:12070-1","title":"velociraptor-0.76.7.0.git145.b60ef1146-1.1 on GA media","description":"These are all security issues fixed in the velociraptor-0.76.7.0.git145.b60ef1146-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-06T00:00:00Z","modified":"2026-10-07T17:23:11.433086957Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"ROOT-APP-NPM-CVE-2026-29074","title":"CVE-2026-29074 in svgo - Patched by Root","description":"Root has patched CVE-2026-29074 in the svgo package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-09-18T10:45:04Z","modified":"2026-09-18T11:15:02.946726458Z","updated_at":"2026-11-02T15:53:27.649662Z"},{"id":"SUSE-SU-2026:2005-1","title":"Security update for cockpit","description":"This update for cockpit fixes the following issues\n\n- CVE-2026-0775: npm: loading of modules from an unsecured location can be used for local privilege escalation and\n  arbitrary code execution in the context of a target user (bsc#1256521).\n- CVE-2026-4802: remote command execution via unsanitized user-controlled parameters within crafted links in system logs\n  UI (bsc#1265040).\n- CVE-2026-29074: svgo: no guard against entity expansion or recursion when processing XML with custom entities can lead\n  to DoS (bsc#1259290).\n","status":"published","published":"2026-05-19T08:23:18Z","modified":"2026-05-20T08:00:08.280081307Z","updated_at":"2026-11-02T15:54:01.610851Z"},{"id":"SUSE-SU-2026:2019-1","title":"Security update for cockpit","description":"This update for cockpit fixes the following issues\n\n- CVE-2026-0775: npm: loading of modules from an unsecured location can be used for local privilege escalation and\n  arbitrary code execution in the context of a target user (bsc#1256521).\n- CVE-2026-4802: remote command execution via unsanitized user-controlled parameters within crafted links in system logs\n  UI (bsc#1265040).\n- CVE-2026-29074: svgo: no guard against entity expansion or recursion when processing XML with custom entities can lead\n  to DoS (bsc#1259290).\n","status":"published","published":"2026-05-20T07:13:11Z","modified":"2026-05-21T08:15:04.323177467Z","updated_at":"2026-11-02T15:54:01.610851Z"}]}}