CVE-2026-118263 Echo: BodyDump can discard BodyLimit overflow errors for unknown-length requests
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-118263?
CVE-2026-118263 is a medium-severity vulnerability in labstack echo, published on 28 Oct 2026.
Official description
Echo is a Go web framework. From 5.0.0 until 5.4.1, Echo v5's BodyDump middleware can discard a BodyLimit overflow error for an unknown-length request when BodyDump's capture limit is below the BodyLimit threshold. BodyDump drains the remaining body while ignoring read errors and replaces it with the captured prefix, so an HTTP/1.1 chunked request can be truncated and processed successfully even though the original body exceeded the configured limit. Known-length requests rejected before BodyDump runs are unaffected, and the issue does not establish a general authentication bypass or denial of service. This issue is fixed in 5.4.1.
Weakness: CWE-252
Which versions are affected by CVE-2026-118263?
2 open source packages ship an affected version, including github.com/labstack/echo/v5.
| Package | Affected | Fixed in |
|---|---|---|
github.com/labstack/echo/v5 Go | From 5.0.0 | 5.4.1 |
github.com/labstack/echo/v5 Go | From 5.0.0 | 5.4.1 |
How do I fix CVE-2026-118263?
Upgrade github.com/labstack/echo/v5 to 5.4.1 or later.
Is CVE-2026-118263 being exploited?
There is no known exploitation of CVE-2026-118263 in the wild and no public exploit code.
Sources
Also known as ECHO-89c4-2f2d-3bfb, GHSA-x9ff-22gv-65f4, UBUNTU-CVE-2026-118263.