How severe is CVE-2026-118260?

No CVSS score has been assigned to CVE-2026-118260 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-118260?

CVE-2026-118260 affects the following packages: github.com/labstack/echo/v4 (Go). Ecosystems affected: Go.

How do I fix CVE-2026-118260?

Update github.com/labstack/echo/v4 to 4.16.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-118260 is resolved across your whole dependency graph.

How do I detect CVE-2026-118260 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/labstack/echo/v4, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-118260 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2026-118260 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-118260 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What type of vulnerability is CVE-2026-118260?

CVE-2026-118260 is classified as Uncontrolled Resource Consumption (CWE-400), CWE-770 (CWE-770). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-118260 published, and has it been updated?

CVE-2026-118260 was published on October 28, 2026 and was last updated on October 30, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

Not in CISA KEV

CVE-2026-118260 — echo

Fix: labstack/echo@3fb0ba7

CVE-2026-118260 is a Uncontrolled Resource Consumption vulnerability in github.com/labstack/echo/v4. A fix is available for github.com/labstack/echo/v4 — see the affected versions and patch details below.

Echo: BodyDump captures request and response bodies without size limits in v4

Also known asGHSA-f48p-c9v4-h7xv

Published

Oct 28, 2026

Updated

Oct 30, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐹github.com/labstack/echo/v4

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Echo v4's opt-in BodyDump middleware read complete request bodies into memory and retained complete response bodies without a capture limit. A client able to submit large requests to a route using BodyDump could cause large allocations before the application handler ran. Large responses, including responses whose size can be influenced by a client, also caused an additional unbounded capture allocation.

Repeated or concurrent requests can exhaust process memory and cause denial of service. BodyDump is not enabled by default. Deployments with effective request limits may reduce the request-side exposure; response capture requires separate consideration.

Affected versions and patch

Echo v4 versions through v4.16.0 are affected. Upgrade to v4.16.1.

The patch adds BodyDumpConfig.MaxRequestBytes and MaxResponseBytes, each defaulting to 5 MiB when zero. A value of -1 explicitly restores unlimited capture. The complete request remains readable by the handler and the complete response is delivered to the client; only the callback's captured data is bounded. Request close behavior and read errors are preserved.

Fix commit.

Workarounds

Disable BodyDump on exposed routes, particularly large uploads and downloads. Alternatively, enforce body-size limits before BodyDump and independently bound the responses that the application generates.

Credits

Reported by @q490107865. The patch also incorporates request-body preservation work from @jakezwang in #3105.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/labstack/echo/v4`	≥ 4.0.0&&< 4.16.1	4.16.1`go get github.com/labstack/echo/v4@v4.16.1`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/labstack/echo/v4, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/labstack/echo/v4 to 4.16.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-118260 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

## Impact Echo v4's opt-in BodyDump middleware read complete request bodies into memory and retained complete response bodies without a capture limit. A client able to submit large requests to a route using BodyDump could cause large allocations before the application handler ran. Large responses, including responses whose size can be influenced by a client, also caused an additional unbounded capture allocation. Repeated or concurrent requests can exhaust process memory and cause denial of service. BodyDump is not enabled by default. Deployments with effective request limits may reduce the

O3 Security · Impact-Aware SCA

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