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TI-2026-74525 Aliases CVE-2026-110835

HTTP header injection in FreeRDP proxy via routing token

Priority MEDIUM 61CWE-93Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

FreeRDP 3.0.0 before 3.32.0 allows HTTP header injection in its proxy. A lone LF in the target portion of a routing token in the Cookie msts header is not rejected, so it is written into the CONNECT request line and Host header (CWE-93). A remote unauthenticated RDP client connecting to a proxy with FixedTarget set to false and an upstream HTTP proxy can alter HTTP request and header framing at that upstream proxy. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

FreeRDP 3.0.0 before 3.32.0 allows HTTP header injection in its proxy because a lone LF in the target portion of a routing token (Cookie: msts=) is not rejected and is written by http_proxy_connect into the CONNECT request line and Host header. A remote unauthenticated RDP client connecting to a proxy using FixedTarget=false and an upstream HTTP proxy can alter HTTP request/header framing at that upstream proxy.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00261 17th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 3.32.0Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
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
FreeRDPFreeRDP3.0.0 to before 3.32.03.32.0Patch availableCNA
  • FreeRDP VendorFreeRDP Affected 3.0.0 to before 3.32.0 Fixed in 3.32.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*3.0.0 to before 3.32.0VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions 3.0.0 to before 3.32.0 Vulnerable ·FreeRDP

Remediation

Upgrade FreeRDP to version 3.32.0, the fixed version. Red Hat lists Red Hat Enterprise Linux 10 as affected with no fix available.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.32.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    FreeRDP 3.32.0

    11 records Highest priority Priority HIGH 1 HIGH, 9 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-74520 FreeRDP serial device handling exhausts file descriptorsPriority HIGH 69
    • TI-2026-74529 Heap out-of-bounds write in FreeRDP JPEG clipboard conversionPriority MEDIUM 64
    • TI-2026-74526 FreeRDP Infinite Loop DoS via Gateway Content-TypePriority MEDIUM 64
    Show all 11 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-110835
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-16 Affected versions changed · Red Hat
  4. 2026-10-16 CVSS score added · Red Hat
  5. 2026-10-18 CISA SSVC decision points changed
  6. 2026-10-18 Priority changed: LOW → MEDIUM
  7. 2026-10-23 CVSS score added · NVD

References

Exploit 1

  • TI-2026-85092 Use-after-free in FreeRDP rdpgfx channel close handling CVSS 4.0CRITICAL 9.3
  • TI-2026-85091 Out-of-bounds write in FreeRDP proxy via bitmap cache v2 capability CVSS 4.0CRITICAL 9.3
  • TI-2026-24435 FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write CVSS 3.1CRITICAL 9.8
  • TI-2023-21373 Out-Of-Bounds Write in FreeRDP CVSS 3.1CRITICAL 9.8
  • TI-2022-08692 Server side NTLM does not properly check parameters in FreeRDP CVSS 3.1CRITICAL 9.1
  • TI-2023-21374 Out-Of-Bounds Read in FreeRDP CVSS 3.1CRITICAL 9.1
See all 336 →

Sources

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