CVE-2026-9769

justhtml through 1.9.1 fixed in 1.10.0 is vulnerable to uncontrolled recursion leading to denial of service. During JustHTML construction, TreeBuilder.finish unconditionally calls populateselectedcontent, which recursively traverses the DOM tree via findelements/findelement without a depth bound...

CVE-2026-8445

justhtml versions are preserved, so untrusted input that is safe in tohtml — including entity-decoded text e.g. script or text from RCDATA/RAWTEXT-parsed elements like , , , and — can be emitted as raw HTML in the Markdown output, enabling a sanitizer bypass and potential cross-site scripting whe...

CVE-2026-7808

justhtml before 1.16.0 contains multiple HTML sanitization bypass issues that can allow active/dangerous content e.g., script or style to survive sanitization, potentially leading to cross-site scripting. The issues primarily affect advanced usage rather than the default JustHTML..., sanitize=Tru...

CVE-2026-5388

justhtml before 1.15.0 contains multiple security issues in URL sanitization helpers cleanurlvalue/cleanurlinjsstring, HTML serialization, Markdown passthrough htmlpassthrough=True, and several custom sanitization-policy edge cases. Depending on configuration, an attacker can bypass sanitization ...

CVE-2026-4671

justhtml before 1.18.0 contains multiple low-severity denial-of-service issues in CSS selector handling and linkification. Applications that evaluate attacker-controlled selector strings via query, matches, or selector-based transforms, run selector matching over very large untrusted documents,...

CVE-2026-9769 justhtml before 1.10.0 Denial of Service via deeply nested HTML

justhtml through 1.9.1 fixed in 1.10.0 is vulnerable to uncontrolled recursion leading to denial of service. During JustHTML construction, TreeBuilder.finish unconditionally calls populateselectedcontent, which recursively traverses the DOM tree via findelements/findelement without a depth bound...

EUVD-2026-64661

justhtml through 1.9.1 fixed in 1.10.0 is vulnerable to uncontrolled recursion leading to denial of service. During JustHTML construction, TreeBuilder.finish unconditionally calls populateselectedcontent, which recursively traverses the DOM tree via findelements/findelement without a depth bound...

CVE-2026-9769

justhtml (Python HTML parser) through version 1.9.1 is vulnerable to uncontrolled recursion leading to denial of service. During JustHTML() construction, TreeBuilder.finish() unconditionally calls _populate_selectedcontent(), which recursively traverses the DOM tree via _find_elements()/_find_ele...

EUVD-2026-64660

justhtml before 1.12.0 versions and . When a DOM tree is processed by sanitizedom using a custom policy that keeps these elements, text nodes inside them are serialized literally without escaping, allowing attacker-controlled text containing the matching closing tag sequence to break out of the...

CVE-2026-8630

justhtml versions ≤ 1.11.0 contain a mutation XSS (mXSS) vulnerability in the serialization of raw-text elements (, [removed]). When sanitize_dom() is invoked with a custom policy that retains these elements, text nodes inside them are serialized without escaping, allowing an attacker to inject a...

EUVD-2026-64659

justhtml versions are preserved, so untrusted input that is safe in tohtml — including entity-decoded text e.g. script or text from RCDATA/RAWTEXT-parsed elements like , , , and — can be emitted as raw HTML in the Markdown output, enabling a sanitizer bypass and potential cross-site scripting whe...

EUVD-2026-64658

justhtml before 1.16.0 contains multiple HTML sanitization bypass issues that can allow active/dangerous content e.g., script or style to survive sanitization, potentially leading to cross-site scripting. The issues primarily affect advanced usage rather than the default JustHTML..., sanitize=Tru...

CVE-2026-8445

justhtml (a Python HTML parsing library) versions <= 1.11.0 are vulnerable to a sanitizer bypass via its to_markdown() method. The root cause is insufficient escaping of HTML-significant characters (angle brackets ) in text nodes during Markdown conversion. While a small set of Markdown metach...

CVE-2026-7808 justhtml before 1.16.0 Multiple Security Issues via Sanitization

justhtml before 1.16.0 contains multiple HTML sanitization bypass issues that can allow active/dangerous content e.g., script or style to survive sanitization, potentially leading to cross-site scripting. The issues primarily affect advanced usage rather than the default JustHTML..., sanitize=Tru...

CVE-2026-8445 justhtml before 1.12.0 Sanitizer Bypass via Markdown

justhtml versions are preserved, so untrusted input that is safe in tohtml — including entity-decoded text e.g. script or text from RCDATA/RAWTEXT-parsed elements like , , , and — can be emitted as raw HTML in the Markdown output, enabling a sanitizer bypass and potential cross-site scripting whe...

CVE-2026-7808

justhtml (Python HTML parsing library) before 1.16.0 contains multiple HTML sanitization bypass issues that can allow active content such as [removed] or to survive sanitization, potentially leading to cross-site scripting . The issues primarily affect advanced usage rather than the default Just...

EUVD-2026-64657

justhtml versions 0.9.0 through 1.21.0 contain a cross-site scripting vulnerability in tomarkdown where inline code spans fail to account for blank lines as block boundaries. Attackers can inject blank lines into code or pre element text to break the inline span, causing sanitized HTML to be...

CVE-2026-77088

justhtml versions 0.9.0 through 1.21.0 are affected by a cross-site scripting (XSS) vulnerability in the to_markdown() function. The root cause is that inline code spans fail to treat blank lines as block boundaries. An attacker can inject blank lines into or element text to break the inline sp...

CVE-2026-6827

justhtml before 1.17.0 (a Python HTML sanitization library) contains multiple security flaws in sanitization, serialization, and programmatic DOM handling. When custom policies preserve foreign namespaces (SVG/MathML), HTML integration points such as SVG and MathML can survive sanitization and ...

EUVD-2026-64655

justhtml before 1.17.0 contains multiple security issues in sanitization, serialization, and programmatic DOM handling. When custom policies preserve foreign namespaces SVG/MathML, dangerous content such as HTML integration points SVG , MathML and mutation-XSS parser-differential payloads could...