Summary
net/http: request smuggling through invalid chunked data: The net/http package accepts data in the chunked transfer encoding containing an invalid chunk-size line terminated by a bare LF. When used in conjunction with a server or proxy which incorrectly interprets a bare LF in a chunk extension as part of the extension, this could permit request smuggling. [CVE-2025-22871] Vendor Affected Components: Go: 1.23.x < 1.23.8
More Details: CVE-2025-22871
Impact
GHSA-5423-JCJM-2GPV has a CVSS score of 9.1 (Critical). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.11.24, 3.3.6, 3.4.0-rc2); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Frequently Asked Questions
- What is GHSA-5423-JCJM-2GPV? GHSA-5423-JCJM-2GPV is a critical-severity security vulnerability in github.com/traefik/traefik/v2 (go), affecting versions < 2.11.24. It is fixed in 2.11.24, 3.3.6, 3.4.0-rc2.
- How severe is GHSA-5423-JCJM-2GPV? GHSA-5423-JCJM-2GPV has a CVSS score of 9.1 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which packages are affected by GHSA-5423-JCJM-2GPV?
github.com/traefik/traefik/v2(go) (versions < 2.11.24)github.com/traefik/traefik/v3(go) (versions < 3.3.6)
- Is there a fix for GHSA-5423-JCJM-2GPV? Yes. GHSA-5423-JCJM-2GPV is fixed in 2.11.24, 3.3.6, 3.4.0-rc2. Upgrade to this version or later.
- Is GHSA-5423-JCJM-2GPV exploitable, and should I be worried? Whether GHSA-5423-JCJM-2GPV is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-5423-JCJM-2GPV is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-5423-JCJM-2GPV?
- Upgrade
github.com/traefik/traefik/v2to 2.11.24 or later - Upgrade
github.com/traefik/traefik/v3to 3.3.6 or later - Upgrade
github.com/traefik/traefik/v3to 3.4.0-rc2 or later
- Upgrade