Medium severity6.1NVD Advisory· Published Feb 20, 2026· Updated Jun 17, 2026
CVE-2026-27120
CVE-2026-27120
Description
Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this can lead to XSS if there is a leaf variable in the attribute that is user controlled. This vulnerability is fixed in 1.4.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/vapor/leaf-kitSwiftURL | < 1.4.1 | 1.4.1 |
Affected products
3- vapor/leaf-kitv5Range: < 1.4.1
Patches
Vulnerability mechanics
References
4- github.com/vapor/leaf-kit/commit/8919e39476c3a4ba05c28b71546bb9195f87ef34nvdPatchWEB
- github.com/vapor/leaf-kit/security/advisories/GHSA-4hfh-fch3-5q7pnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-4hfh-fch3-5q7pghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-27120ghsaADVISORY
News mentions
0No linked articles in our index yet.