CVE-2026-92106 json
lazy_html serializes SVG and MathML style and script text unescaped, allowing mutation XSS
published 2026-09-25 44 d ago modified 2026-09-25 44 d ago also EEF-CVE-2026-92106 , GHSA-8rqp-v692-v82q , EUVD-2026-86828
- cvss
- 2.3
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- public exploits
- 0
- none known
Summary
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in dashbitco lazy_html allows mutation XSS via a parse and serialize round-trip of attacker-supplied HTML.
LazyHTML.to_html/2 and LazyHTML.Tree.to_html/2 decide whether to escape an element's text from its tag name alone. A style or script element inside SVG or MathML foreign content is parsed with character references decoded, but is serialized as an HTML raw-text element, so its text is emitted unescaped. Encoded markup such as </style><img src=x onerror=...> inside <svg><style> therefore closes the element on re-parse and becomes live markup. Applications that parse untrusted HTML with lazy_html, filter the document or tree, and serialize it for display are affected, since the payload is a plain text node that no element or attribute filter sees.
This issue affects lazy_html: from 0.1.0 before 0.1.13.
Patch / fix
- hex lazy_html 0.1.13
- dashbitco lazy_html 0.1.13
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 44 d ago
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 2.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N |
| CNA | 4.0 | 2.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| hex | lazy_html | >=0.1.0, <0.1.13 |
0.1.13 |
Affected products
- dashbitco lazy_html
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/dashbitco/lazy_html/commit/1dee15746c024916b3110af8b168c2f3b3065fbd
related, web
-
github.com
/dashbitco/lazy_html/commit/f32c7fd6223225b68bc8691c78b6d4a77972f1d5
patch
-
github.com
/dashbitco/lazy_html/security/advisories/GHSA-8rqp-v692-v82q
related, vendor-advisory, advisory
-
cna.erlef.org
/cves/CVE-2026-92106.html
related, web
-
osv.dev
/vulnerability/EEF-CVE-2026-92106
related
-
hex.pm
/packages/lazy_html
package
Sources
- CVE List CVE-2026-92106
- NVD CVE-2026-92106
- OSV EEF-CVE-2026-92106
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.