VulnerabilityPublished 15 Sep 2026Updated 23 Sep 2026

CVE-2026-91959: FreeRDP before 3.31.0 contains a buffer over-read vulnerability in the rts_read_result function

Affects freerdpSource GCVE Database

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Not known to be exploited · CVSS 6.5 Medium · fixed in 3.31.0+dfsg-0ubuntu0.24.04.1 : update freerdp when convenient.

Data as of 5 Nov 2026, 23:24 UTC

CVSS 3.1 base score

6.5Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3.31.0+dfsg-0ubuntu0.24.04.1, 3.31.0+dfsg-0ubuntu0.26.04.1

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade the Ubuntu freerdp3 to 3.31.0+dfsg-0ubuntu0.24.04.1 (package) or 3.31.0+dfsg-0ubuntu0.26.04.1 (package).

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSfreerdp3`pkg:deb/ubuntu/freerdp3?arch=source&distro=resolute`Other threats	Affected <3.31.0+dfsg-0ubuntu0.26.04.1	Fixed in 3.31.0+dfsg-0ubuntu0.26.04.1
Ubuntu 24.04 LTSfreerdp3`pkg:deb/ubuntu/freerdp3?arch=source&distro=noble`Other threats	Affected <3.31.0+dfsg-0ubuntu0.24.04.1	Fixed in 3.31.0+dfsg-0ubuntu0.24.04.1
Ubuntu Pro 24.04 LTSfreerdp2`pkg:deb/ubuntu/freerdp2?arch=source&distro=esm-apps/noble`Other threats	Affected 2.10.0+dfsg1-1.1ubuntu1 – 2.11.5+dfsg1-1ubuntu0.1~esm6 12 affected builds	Fixed in–
Ubuntu 22.04 LTSfreerdp2`pkg:deb/ubuntu/freerdp2?arch=source&distro=jammy`Other threats	Affected 2.3.0+dfsg1-2build1 – 2.6.1+dfsg1-3ubuntu2.11 23 affected builds	Fixed in–
Ubuntu Pro 20.04 LTSfreerdp2`pkg:deb/ubuntu/freerdp2?arch=source&distro=esm-infra/focal`Other threats	Affected 2.0.0~git20190204.1.2693389a+dfsg1-1 – 2.6.1+dfsg1-0ubuntu0.20.04.2+esm4 17 affected builds	Fixed in–
Ubuntu Pro 18.04 LTSfreerdp2`pkg:deb/ubuntu/freerdp2?arch=source&distro=esm-infra/bionic`Other threats	Affected 2.0.0~git20170725.1.1648deb+dfsg1-1 – 2.2.0+dfsg1-0ubuntu0.18.04.4+esm6 19 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available for this vulnerability. Users and administrators should apply the official updates provided for FreeRDP in their respective distributions to remediate the issue. Since this is not a cloud service, manual patching is required. No additional mitigation steps are indicated by the vendor advisory.

Description

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.

Impact

Successful exploitation of this vulnerability can cause a denial of service (application crash) due to out-of-bounds memory read. There is no impact on confidentiality or integrity. The attack can be performed remotely over the network and requires user interaction.

Summary

The vulnerability identified as CVE-2026-91959 in FreeRDP involves the rts_read_result function performing length validation on 2 bytes but subsequently reading 4 bytes. This mismatch can cause an out-of-bounds read, potentially leading to a denial of service condition. The issue affects numerous FreeRDP versions distributed across several Ubuntu releases. The CVSS v3.1 base score is 6.5, reflecting a medium severity with network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, no confidentiality or integrity impact, but high availability impact. A patch is available to remediate this vulnerability.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 23 Sep 2026, 16:48 UTC

Technical details

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