VulnerabilityPublished 5 Nov 2026

CVE-2026-110931: Infinite Loop

Source GCVE Database

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Mentioned vulnerabilities

CVE-2026-7307

Authoritative record:CVE-2026-110931· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 5 Nov 2026, 19:36 UTC

CVSS 3.1 base score

7.5High

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

Thin evidence

One scorer or none

CVSS scores by source
CNA (redhat)	CVSS 3.1	7.5

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
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: None: The vulnerable system can be exploited without any interaction from any user.
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 5 Nov 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.

ghsa-w9c8-6pxq-5xf8

What to do

Affected software

Product	Affected	Fixed in
Red Hat Build of Keycloakkeycloak-services	Affected–	Fixed in–
Red Hat Build of Keycloakrhbk/keycloak-rhel9	Affected–	Fixed in–
Red Hat Single Sign-On 7keycloak-services	Affected–	Fixed in–

AI-suggested

Currently, no mitigation or patch meeting Red Hat's criteria for ease of use, applicability, and stability is available. Users should monitor Red Hat advisories for updates and consider compensating controls such as restricting access to the SAML 1.1 interface or deploying network-level protections to limit exposure until a fix is released.

Description

A vulnerability in the SAML 1.1 assertion parser of Keycloak allows a remote unauthenticated attacker to cause an infinite loop when processing the AuthorityBinding element. This results in memory exhaustion and crashes the Keycloak service, causing denial of service. The issue stems from an incomplete fix of a previous vulnerability and affects the availability of the service.

Impact

Successful exploitation causes a complete denial of service by terminating the Java Virtual Machine running Keycloak due to memory exhaustion from an infinite loop in the SAML 1.1 AuthorityBinding parsing logic. This disrupts identity and access management services relying on Keycloak, impacting availability but not confidentiality or integrity.

Summary

CVE-2026-110931 is a denial of service vulnerability in Keycloak's SAML 1.1 assertion parser. The flaw occurs specifically in the handling of the AuthorityBinding element within an authentication statement. Due to an incomplete remediation of a prior vulnerability (CVE-2026-7307), the parser can enter an infinite loop that consumes all available memory, leading to JVM termination and service unavailability. The vulnerability can be triggered remotely without authentication by sending a crafted SAML 1.1 assertion. Red Hat has assessed the severity as Important (high) with a CVSS 3.1 base score of 7.5, reflecting network attack vector, low complexity, no privileges or user interaction required, and high impact on availability.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Nov 2026, 19:36 UTC

WeaknessesCWE-835

Technical details

References

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