Track vulnerabilities like this one. Sign up free to get alerted when software you use is affected.
5.3

Ktor HTTP Request Smuggling allows unauthorized access

CVE-2025-29904 · published 1 year ago
Summary

An attacker can manipulate HTTP requests to access sensitive data or execute malicious actions by exploiting a vulnerability in JetBrains Ktor versions prior to 3.1.1. This could potentially lead to unauthorized access to sensitive information or business disruption. Update to Ktor 3.1.1 or later to fix the issue.

What to do
  • Update jetbrains ktor to version 3.1.1 or later.
Affected software
VendorProductAffected versions
jetbrains ktor < 3.1.1
cpe:2.3:a:jetbrains:ktor:*:*:*:*:*:*:*:*
Original advisory text
In JetBrains Ktor before 3.1.1 an HTTP Request Smuggling was possible
In JetBrains Ktor before 3.1.1 an HTTP Request Smuggling was possible
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
5.3 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Timeline
Published12 Mar 2025
Updated4 Nov 2026
First seen7 Mar 2026
Sources
CVE-2025-29904 · NVD
CVE-2025-29904 · OSV
Track software like this
Free during beta