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TI-2025-21289 Aliases CVE-2025-29904GHSA-cqw7-466v-f9g6

In JetBrains Ktor before 3.1.1 an HTTP Request Smuggling was possible

Priority LOW 30CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

In JetBrains Ktor before 3.1.1 an HTTP Request Smuggling was possible

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0033 26th percentileScored 2026-11-07
Fix Fixed Ktor (JetBrains): 3.1.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
JetBrainsKtorbefore 3.1.13.1.1Patch availableCNA
  • Ktor VendorJetBrains Affected before 3.1.1 Fixed in 3.1.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:jetbrains:ktor:*:*:*:*:*:*:*:*before 3.1.1VulnerableJetBrains
  • cpe:2.3:a:jetbrains:ktor:*:*:*:*:*:*:*:* Versions before 3.1.1 Vulnerable ·JetBrains

Remediation

  • Fix · CNA Ktor (JetBrains) Fixed in 3.1.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-29904
  2. 2026-10-03 Alias added: GHSA-cqw7-466v-f9g6

References

Other 1

  • TI-2023-24413 In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE CVSS 3.1CRITICAL 9.8
  • TI-2019-09527 JetBrains Ktor framework before 1.2.0-rc does not sanitize the username provided by the… CVSS 3.1CRITICAL 9.8
  • TI-2023-24414 In JetBrains Ktor before 2.3.5 server certificates were not verified CVSS 3.1CRITICAL 9.1
  • TI-2022-24056 In JetBrains Ktor before 2.3.0 path traversal in the `resolveResource` method was possible CVSS 3.1HIGH 7.5
  • TI-2022-12277 SHA1 implementation in JetBrains Ktor Native 2.0.0 was returning the same value. CVSS 3.1HIGH 8.7
  • TI-2019-07426 JetBrains Ktor framework (created using the Kotlin IDE template) versions before 1.1.0… CVSS 3.0HIGH 8.1
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences