VulnerabilityPublished 23 Oct 2026Updated 27 Oct 2026

CVE-2026-114437: Golang github go chi chi: (In the Golang Chi web framework, the ClientIPFromXFF middleware skips ...)

Affects golang-github-go-chi-chiSource GCVE Database

Authoritative record:CVE-2026-114437· Medium 4.8

Not known to be exploited · CVSS 4.8 Medium.

Data as of 27 Oct 2026, 07:12 UTC

CVSS 3.1 base score

4.8Medium

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

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

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
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: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
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: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on 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 21 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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
Ubuntu 26.10golang-github-go-chi-chi`pkg:deb/ubuntu/golang-github-go-chi-chi?arch=source&distro=stonking`Other threats	Affected =5.2.3-1 =5.3.0-1	Fixed in–
Ubuntu 26.04 LTSgolang-github-go-chi-chi`pkg:deb/ubuntu/golang-github-go-chi-chi?arch=source&distro=resolute`Other threats	Affected =5.2.0-1 =5.2.3-1	Fixed in–
Ubuntu 24.04 LTSgolang-github-go-chi-chi`pkg:deb/ubuntu/golang-github-go-chi-chi?arch=source&distro=noble`Other threats	Affected =5.0.7-1	Fixed in–
Ubuntu 22.04 LTSgolang-github-go-chi-chi`pkg:deb/ubuntu/golang-github-go-chi-chi?arch=source&distro=jammy`Other threats	Affected =1.5.1-2 =5.0.7-1	Fixed in–

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

AI-suggested

Until a fix is available, users should be cautious about relying on the ClientIPFromXFF middleware for security decisions involving client IP addresses.

Description

A medium severity vulnerability (CVE-2026-114437) affects the Golang Chi web framework in certain versions. The issue involves the ClientIPFromXFF middleware, which improperly handles client IP extraction from the X-Forwarded-For header. This flaw could lead to limited confidentiality and integrity impacts but does not affect availability. The vulnerability has a CVSS score of 4.8 and no known exploits in the wild. No patch or remediation details are provided in the available data.

Impact

The vulnerability may allow an attacker to cause limited confidentiality and integrity issues by manipulating the client IP address as interpreted by the middleware. There is no impact on availability. No active exploitation has been observed.

Summary

CVE-2026-114437 is a vulnerability in the Golang Chi web framework's ClientIPFromXFF middleware that causes it to skip or mishandle client IP extraction from the X-Forwarded-For header. This can result in incorrect client IP identification, potentially impacting confidentiality and integrity. The vulnerability is rated medium severity with a CVSS 3.1 base score of 4.8 (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N). Affected versions include specific releases such as 1.5.1-2, 5.0.7-1, 5.2.0-1, 5.2.3-1, and 5.3.0-1. There is no information on patches or vendor advisories, and no known exploitation in the wild has been reported.

References

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