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CVE-2026-27120

Published: Feb 20, 2026Updated: Mar 2, 2026 Sources: CVE List NVD GHSACWE-75
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.2%
Top 86.4%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

Description

Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-75CWE-79CWE-87

Affected Products

github.com/vapor/leaf-kitSwiftURL
Library
OSS Libraries / generic-library
leaf-kitvapor
Mixed
OSS Libraries / web-framework
leafkitvapor
Mixed
OSS Libraries / web-framework
swifturlOSS Librariesaka swift-nio-http2, github.com/vapor/vapor, github.com/pytorch/executorch, swift-nio-http2, github.com/apple/swift-nio-http2
vapoross-projectOSS Librariesaka vapor swift framework

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/vapor/leaf-kit/security/advisories/GHSA-4hfh-fch3-5q7p
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-27120
nvd.nist.gov
https://github.com/vapor/leaf-kit/commit/8919e39476c3a4ba05c28b71546bb9195f87ef34
github.com
and 1 more references View all →

Timeline

Published
Feb 20, 2026
Last Updated
Mar 2, 2026

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