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Response snapshot Oct 27, 2026, 00:12 UTC

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VulnerabilityGHSA-f48p-c9v4-h7xv

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

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.

At a glance

Exploited
Not known
Severity
Not scored yet
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: github.com/labstack/echo/v4: 4.16.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-f48p-c9v4-h7xv (opens a new tab)

What happened

## 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

Continue reading

Echo v4 versions through v4.16.0 are affected. Upgrade to [v4.16.1](https://github.com/labstack/echo/releases/tag/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](https://github.com/labstack/echo/commit/3fb0ba7e17645bb65611e2a08875d0a2f65c421f).

## 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](https://github.com/labstack/echo/pull/3105).

Affected package ranges reported by GitHub: github.com/labstack/echo/v4: >= 4.0.0, < 4.16.1

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-f48p-c9v4-h7xv (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-f48p-c9v4-h7xv, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  3. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-f48p-c9v4-h7xv, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  4. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-f48p-c9v4-h7xv, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 23). Echo: BodyDump captures request and response bodies without size limits in v4. https://kevwire.com/record/GHSA-f48p-c9v4-h7xv

MLA

"Echo: BodyDump captures request and response bodies without size limits in v4." KEVWire, 23 Oct. 2026, kevwire.com/record/GHSA-f48p-c9v4-h7xv.

Chicago

KEVWire. "Echo: BodyDump captures request and response bodies without size limits in v4." Last modified October 23, 2026. https://kevwire.com/record/GHSA-f48p-c9v4-h7xv.

Evidence summary (plain text)

Echo: BodyDump captures request and response bodies without size limits in v4 (Oct 23, 2026).
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.
Sources:
GitHub-reviewed advisory GHSA-f48p-c9v4-h7xv: https://github.com/advisories/GHSA-f48p-c9v4-h7xv
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QyMDo1MTozMFrOAAf0Mg%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QyMDo0OToxMlrOAAf0LQ%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: GHSA-f48p-c9v4-h7xv.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 20:55 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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