VulnerabilityPublished 17 Sep 2026Updated 9 Oct 2026

CVE-2026-81829: Red Hat build of Quarkus · Path Traversal

Affects Red Hat build of QuarkusSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium · patch available : update Red Hat build of Quarkus when convenient.

Data as of 1 Nov 2026, 22:58 UTC

CVSS 3.1 base score

5.3Medium

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

EPSS: 0.5% chance of exploitation in 30 days – higher than 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available

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

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

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: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 17 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 1 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

Affected software

Product	Affected	Fixed in
Red HatRed Hat build of Quarkus 3.27.5.SP2	Affected–	Fixed in–
Red HatRed Hat build of Quarkus 3.33.3.SP2	Affected–	Fixed in–
Red HatExploit Intelligence	Affected–	Fixed in–
Red HatRed Hat build of Apicurio Registry 3	Affected–	Fixed in–
Red HatRed Hat build of Apicurio Registry 3	Affected–	Fixed in–
Red HatRed Hat build of Quarkus	Affected–	Fixed in–

AI-suggested

Red Hat has released a security update for Red Hat build of Quarkus 3.27.5.SP2 that addresses this vulnerability. Users should apply the official Red Hat update RHSA-2026:69470 to remediate the issue. Since this is a cloud service component, Red Hat manages remediation for hosted environments. Check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-81829 for detailed update instructions and ensure all relevant errata are applied.

Description

CVE-2026-81829 is a path traversal vulnerability in SmallRye JWT's AwsAlbKeyResolver used in Red Hat build of Quarkus 3.27.5.SP2. The flaw allows an unauthenticated remote attacker to manipulate the JWT kid header to cause the application server to issue GET requests to arbitrary paths on the same origin as the configured key endpoint. This can lead to unauthorized reading of non-public or internal data before JWT signature verification occurs. A security update addressing this vulnerability is available from Red Hat.

Impact

An unauthenticated remote attacker can exploit this vulnerability to cause the application server to perform unauthorized GET requests to arbitrary paths on the same origin as the key endpoint. This may allow the attacker to access non-public or internal data before the JWT signature verification is performed, potentially leading to information disclosure. There is no indication of impact on integrity or availability.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Oct 2026, 19:08 UTC

Technical details

References

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