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TI-2026-62094 Aliases CVE-2026-91959GHSA-c7qq-9mg2-ccx2

FreeRDP before 3.31.0 Buffer Over-read via RTS Gateway

Priority MEDIUM 64CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 14 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.

Summary

FreeRDP before 3.31.0 contains a buffer over-read vulnerability in the rts_read_result function within the RPC gateway transport parser. Attackers can send a malicious BIND_ACK PDU with a truncated result entry to trigger an out-of-bounds read causing process abort.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00391 33rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 3.31.0Red Hat: 7 advisoriesRed Hat: 14 fixed, 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
FreeRDPFreeRDPbefore 3.31.03.31.0Patch availableCNA
  • FreeRDP VendorFreeRDP Affected before 3.31.0 Fixed in 3.31.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 3.31.0VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 3.31.0 Vulnerable ·FreeRDP

Remediation

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.31.0

Red Hat 7 advisories

  • RHSA-2026:93559 Released 2026-11-02 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) freerdp-2.1.1-5.el7_9.14, freerdp-libs-2.1.1-5.el7_9.14, freerdp-libs-2.1.1-5.el7_9.14.ppc +2
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) freerdp-devel-2.1.1-5.el7_9.14, freerdp-devel-2.1.1-5.el7_9.14.ppc, libwinpr-devel-2.1.1-5.el7_9.14 +1
  • RHSA-2026:93549 Released 2026-11-02 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) freerdp-2:2.2.0-7.el8_6.14, freerdp-libs-2:2.2.0-7.el8_6.14, libwinpr-2:2.2.0-7.el8_6.14 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) freerdp-2:2.2.0-7.el8_6.14, freerdp-libs-2:2.2.0-7.el8_6.14, libwinpr-2:2.2.0-7.el8_6.14 +1
  • RHSA-2026:93537 Released 2026-11-02 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) freerdp-2:2.2.0-12.el8_8.13, freerdp-libs-2:2.2.0-12.el8_8.13, libwinpr-2:2.2.0-12.el8_8.13 +1
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) freerdp-2:2.2.0-12.el8_8.13, freerdp-libs-2:2.2.0-12.el8_8.13, libwinpr-2:2.2.0-12.el8_8.13 +1
Show 4 more Red Hat advisories
  • RHSA-2026:93538 Released 2026-11-02 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) freerdp-2:2.2.0-14.el8_4.5, freerdp-libs-2:2.2.0-14.el8_4.5, libwinpr-2:2.2.0-14.el8_4.5 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) freerdp-2:2.2.0-14.el8_4.5, freerdp-libs-2:2.2.0-14.el8_4.5, libwinpr-2:2.2.0-14.el8_4.5 +1
  • RHSA-2026:76755 Released 2026-10-08 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.11.7-7.el9_8.8, freerdp-libs-2:2.11.7-7.el9_8.8, libwinpr-2:2.11.7-7.el9_8.8
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel-2:2.11.7-7.el9_8.8, libwinpr-devel-2:2.11.7-7.el9_8.8
  • RHSA-2026:76747 Released 2026-10-06 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 8) freerdp-2:2.11.7-14.el8_10, freerdp-libs-2:2.11.7-14.el8_10, libwinpr-2:2.11.7-14.el8_10 +1
    • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel-2:2.11.7-14.el8_10
  • RHSA-2026:75570 Released 2026-10-05 · Red Hat rating Important
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 10) freerdp-2:3.10.3-12.el10_2.14, freerdp-libs-2:3.10.3-12.el10_2.14, libwinpr-2:3.10.3-12.el10_2.14
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-devel-2:3.10.3-12.el10_2.14, freerdp-server-2:3.10.3-12.el10_2.14, libwinpr-devel-2:3.10.3-12.el10_2.14

Fixed in the same release

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

  • Release ·

    FreeRDP 3.31.0

    20 records Highest priority Priority HIGH 1 HIGH, 12 MEDIUM, 7 LOW

    Other records, highest priority first

    • TI-2026-62090 FreeRDP before 3.31.0 Denial of Service via Desktop DimensionsPriority HIGH 75
    • TI-2026-62098 FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure via urbdrcPriority MEDIUM 64
    • TI-2026-62095 FreeRDP before 3.31.0 Integer Overflow Double FreePriority MEDIUM 64
    Show all 20 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:75570
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:76747
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:76755
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:93538
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:93549
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:93537
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:93538
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:93549
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:93537
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:76747
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:75570
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:76755
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:93559
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:93559

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-91959
  2. 2026-10-03 Alias added: GHSA-c7qq-9mg2-ccx2
  3. 2026-10-05 Fix available: RHSA-2026:75570 · Red Hat
  4. 2026-10-05 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · Red Hat
  5. 2026-10-06 Fix available: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · Red Hat
  6. 2026-10-07 Fix available: RHSA-2026:76747 · Red Hat
  7. 2026-10-09 Fix available: RHSA-2026:76755 · Red Hat
  8. 2026-10-09 Fix available: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · Red Hat
  9. 2026-11-02 Fix available: RHSA-2026:93538 · Red Hat
  10. 2026-11-02 Fix available: RHSA-2026:93537 · Red Hat
  11. 2026-11-02 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) +1 · Red Hat
  12. 2026-11-02 Fix available: RHSA-2026:93549 · Red Hat
  13. 2026-11-02 Fix available: RHSA-2026:93559 · Red Hat
  14. 2026-11-02 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6), Red Hat Enterprise Linux Server (v. 7 ELS) +1 · Red Hat

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