Vulnerability-Lookup

ALSA-2026:76747

Vulnerability from osv_almalinux – Published: 2026-10-06 00:00 – Updated: 2026-10-07 07:33 – Source website

Summary

Important: freerdp security update

Details

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.

Security Fix(es):

FreeRDP: FreeRDP: Denial of Service via crafted Surface Bits command (CVE-2026-91954)
FreeRDP: FreeRDP: Remote code execution via heap buffer overflow in Server Redirection PDU (CVE-2026-91964)
FreeRDP: FreeRDP: Denial of Service via out-of-bounds read in URBDRC channel (CVE-2026-91956)
FreeRDP: FreeRDP: Remote code execution via uninitialized heap memory disclosure (CVE-2026-91963)
FreeRDP: FreeRDP: Denial of Service due to buffer over-read in RPC gateway (CVE-2026-91959)
FreeRDP: FreeRDP: Heap buffer overflow via oversized LB_LOAD_BALANCE_INFO routing token can lead to heap corruption. (CVE-2026-91953)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:76747	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-91953	REPORT
	https://access.redhat.com/security/cve/CVE-2026-91954	REPORT
	https://access.redhat.com/security/cve/CVE-2026-91956	REPORT
	https://access.redhat.com/security/cve/CVE-2026-91959	REPORT
	https://access.redhat.com/security/cve/CVE-2026-91963	REPORT
	https://access.redhat.com/security/cve/CVE-2026-91964	REPORT
	https://bugzilla.redhat.com/2533906	REPORT
	https://bugzilla.redhat.com/2533911	REPORT
	https://bugzilla.redhat.com/2533927	REPORT
	https://bugzilla.redhat.com/2533930	REPORT
	https://bugzilla.redhat.com/2533951	REPORT
	https://bugzilla.redhat.com/2533959	REPORT
	https://errata.almalinux.org/8/ALSA-2026-76747.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "freerdp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:2.11.7-14.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "freerdp-devel"
      },
      "ranges": [
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          "events": [
            {
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            },
            {
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          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "freerdp-libs"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
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          ],
          "type": "ECOSYSTEM"
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      ]
    },
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      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "libwinpr"
      },
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            },
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              "fixed": "2:2.11.7-14.el8_10"
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          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.  \n\nSecurity Fix(es):  \n\n  * FreeRDP: FreeRDP: Denial of Service via crafted Surface Bits command (CVE-2026-91954)\n  * FreeRDP: FreeRDP: Remote code execution via heap buffer overflow in Server Redirection PDU (CVE-2026-91964)\n  * FreeRDP: FreeRDP: Denial of Service via out-of-bounds read in URBDRC channel (CVE-2026-91956)\n  * FreeRDP: FreeRDP: Remote code execution via uninitialized heap memory disclosure (CVE-2026-91963)\n  * FreeRDP: FreeRDP: Denial of Service due to buffer over-read in RPC gateway (CVE-2026-91959)\n  * FreeRDP: FreeRDP: Heap buffer overflow via oversized LB_LOAD_BALANCE_INFO routing token can lead to heap corruption. (CVE-2026-91953)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:76747",
  "modified": "2026-10-07T07:33:16Z",
  "published": "2026-10-06T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:76747"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-91953"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-91954"
    },
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      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-91956"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-91959"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-91963"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-91964"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533906"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533911"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533927"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533930"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533951"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533959"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2026-76747.html"
    }
  ],
  "related": [
    "CVE-2026-91954",
    "CVE-2026-91964",
    "CVE-2026-91956",
    "CVE-2026-91963",
    "CVE-2026-91959",
    "CVE-2026-91953"
  ],
  "summary": "Important: freerdp security update"
}

CVE-2026-91953 (GCVE-0-2026-91953)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-15 16:01

Title

FreeRDP before 3.31.0 Heap Buffer Overflow via LB_LOAD_BALANCE_INFO

Summary

FreeRDP versions before 3.31.0 contain a heap buffer overflow vulnerability in nego_send_negotiation_request() that fails to validate the LB_LOAD_BALANCE_INFO field length before writing to a fixed 512-byte buffer. A malicious RDP server or man-in-the-middle can send a Server Redirection PDU with an oversized LB_LOAD_BALANCE_INFO value to overflow the buffer with attacker-controlled content, causing denial of service or heap corruption before authentication completes.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 16:01 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

VulnCheck mitre root Scorecard

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver) cpe:2.3:a:freerdp:freerdp::::::::

Date Public

2026-09-01 00:00

Show details on NVD website

JSON

To clipboard

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CVE-2026-91954 (GCVE-0-2026-91954)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-17 19:28

Title

FreeRDP before 3.31.0 NULL Pointer Dereference via NSCodec

Summary

FreeRDP before 3.31.0 contains a null pointer dereference vulnerability in gdi_surface_bits when processing Surface Bits commands with NSCodec codec ID. A malicious RDP server can crash a FreeRDP client by sending a crafted Surface Bits command claiming to use NSCodec, even when the codec is disabled.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 19:15 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

VulnCheck mitre root Scorecard

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver) cpe:2.3:a:freerdp:freerdp::::::::

Date Public

2026-09-01 00:00

Credits

dutchypoo

Show details on NVD website

JSON

To clipboard

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CVE-2026-91956 (GCVE-0-2026-91956)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-18 17:23

Title

FreeRDP before 3.31.0 Out-of-Bounds Read via URBDRC

Summary

FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the URBDRC channel's func_get_ep_desc function that indexes interface arrays by position instead of protocol field InterfaceNumber. A malicious RDP server can send a crafted SELECT_CONFIGURATION message with permuted InterfaceNumber values to read past allocated heap memory and crash the client.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 17:15 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck mitre root Scorecard

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver) cpe:2.3:a:freerdp:freerdp::::::::

Date Public

2026-09-01 00:00

Credits

Baixingyuu KeenSecurityLab

Show details on NVD website

JSON

To clipboard

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CVE-2026-91959 (GCVE-0-2026-91959)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-20 00:35

Title

FreeRDP before 3.31.0 Buffer Over-read via RTS Gateway

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.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-20 00:29 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck mitre root Scorecard

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver) cpe:2.3:a:freerdp:freerdp::::::::

Date Public

2026-09-01 00:00

Credits

Nambers

Show details on NVD website

JSON

To clipboard

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CVE-2026-91963 (GCVE-0-2026-91963)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-15 15:58

Title

FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure via urbdrc

Summary

FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 15:56 UTC

CWE

CWE-457 - Use of Uninitialized Variable

Assigner

VulnCheck mitre root Scorecard

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-2.0.…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 2.0.0 , < 3.0.0 (semver) Affected: 3.0.0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver)
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver)

Date Public

2026-09-01 00:00

Credits

iarce-qb

Show details on NVD website

JSON

To clipboard

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CVE-2026-91964 (GCVE-0-2026-91964)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-16 15:51

Title

FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken

Summary

FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 03:56 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

VulnCheck mitre root Scorecard

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-2.0.…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 2.0.0 , < 3.0.0 (semver) Affected: 3.0.0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver)
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver)

Date Public

2026-09-01 00:00

Credits

iarce-qb

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

ALSA-2026:76747

CVE-2026-91953 (GCVE-0-2026-91953)

CVE-2026-91954 (GCVE-0-2026-91954)

CVE-2026-91956 (GCVE-0-2026-91956)

CVE-2026-91959 (GCVE-0-2026-91959)

CVE-2026-91963 (GCVE-0-2026-91963)

CVE-2026-91964 (GCVE-0-2026-91964)

Tags

Sightings

Nomenclature

Related by attack behaviour