GHSA-PMHH-3W7G-XQP8
Vulnerability from github – Published: 2026-08-06 21:09 – Updated: 2026-08-06 21:09When a custom Safelist permits certain raw-text elements, jsoup may incorrectly sanitize malformed HTML containing a tag name that ends in a control character. The tag may acquire the parsing behavior of a different element, causing content that should remain text to be emitted as active markup after serialization and potentially allowing XSS.
jsoup’s built-in Safelists are unaffected.
Patches
Upgrade to jsoup 1.23.1.
Workarounds
Until upgrading, do not permit raw-text elements in custom Safelists used to clean untrusted HTML.
Additional security considerations
This fix addresses malformed tag-name handling only.
Permitting raw-text elements in a custom Safelist does not make their contents inherently safe. For example, applications that permit style must apply appropriate CSS safeguards separately, because jsoup does not parse or sanitize CSS.
{
"affected": [
{
"package": {
"ecosystem": "Maven",
"name": "org.jsoup:jsoup"
},
"ranges": [
{
"events": [
{
"introduced": "1.14.3"
},
{
"fixed": "1.23.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-71497"
],
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"github_reviewed": true,
"github_reviewed_at": "2026-08-06T21:09:36Z",
"nvd_published_at": null,
"severity": "MODERATE"
},
"details": "When a custom `Safelist` permits certain raw-text elements, jsoup may incorrectly sanitize malformed HTML containing a tag name that ends in a control character. The tag may acquire the parsing behavior of a different element, causing content that should remain text to be emitted as active markup after serialization and potentially allowing XSS.\n\njsoup\u2019s built-in Safelists are unaffected.\n\n## Patches\n\nUpgrade to jsoup 1.23.1.\n\n## Workarounds\n\nUntil upgrading, do not permit raw-text elements in custom Safelists used to clean untrusted HTML.\n\n## Additional security considerations\n\nThis fix addresses malformed tag-name handling only.\n\nPermitting raw-text elements in a custom `Safelist` does not make their contents inherently safe. For example, applications that permit `style` must apply appropriate CSS safeguards separately, because jsoup does not parse or sanitize CSS.",
"id": "GHSA-pmhh-3w7g-xqp8",
"modified": "2026-08-06T21:09:36Z",
"published": "2026-08-06T21:09:36Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/jhy/jsoup/security/advisories/GHSA-pmhh-3w7g-xqp8"
},
{
"type": "WEB",
"url": "https://github.com/jhy/jsoup/issues/2538"
},
{
"type": "WEB",
"url": "https://github.com/jhy/jsoup/commit/92f1aca552548b484bc7d4b94c51e48b8e6eca70"
},
{
"type": "PACKAGE",
"url": "https://github.com/jhy/jsoup"
},
{
"type": "WEB",
"url": "https://github.com/jhy/jsoup/releases/tag/jsoup-1.23.1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
}
],
"summary": "jsoup: Cleaner may expose markup with custom raw-text elements"
}
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