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Vulnerabilities

Security fix · CVE-2026-118261

Echo: Decompress permits unbounded gzip expansion in v4

Published Oct 23, 2026 · catalog updated Oct 28, 2026 · Echo: Decompress permits unbounded

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-118261. EPSS is 0.37%. Act only if a listed version of Echo: Decompress permits unbounded is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Echo: Decompress permits unbounded).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.37%
Remediation
Advisory link
Affected products
Go github.com/labstack/echo/v4

## Impact Echo v4's opt-in Decompress middleware exposed a gzip-decoded request stream without limiting its expanded size. A small compressed request could therefore produce a very large decoded body. Handlers that read or bind that body could consume excessive memory or CPU, and repeated or concurrent requests could cause denial of service. The middleware is not enabled by default. A limit on the compressed request size alone does not bound the decompressed size. Applications that already apply an effective body limit after decompression have reduced exposure. ## Affected versions and patch 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 , defaulting to 100 MiB when zero. A value of explicitly disables the limit. Reading beyond the cap returns (HTTP 413), including through JSON and XML binding. Bodies exactly at the configured limit remain valid. Streaming enforcement requires callers to handle body-read errors. [Fix commit](https://github.com/labstack/echo/commit/3fb0ba7e17645bb65611e2a08875d0a2f65c421f). ## Workarounds Disable gzip request decompression on exposed routes, or place BodyLimit after Decompress so the application limit applies to decoded bytes. Apply suitable request deadlines and concurrency limits as well. ## Credits Reported by @q490107865. The exact-limit behavior incorporates @Shubham-Padkonde's work in [#3136](https://github.com/labstack/echo/pull/3136).

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Go github.com/labstack/echo/v44.0.0 → 4.16.1

How to fix CVE-2026-118261

  • Upgrade

    CVE-2026-118261 lists a fix boundary at 4.16.1. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in 4.0.0 → 4.16.1

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-118261. EPSS is 0.37%. Act only if a listed version of Echo: Decompress permits unbounded is installed.

Which versions are affected?

Compare what you have installed with 4.0.0 → 4.16.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-400: Uncontrolled Resource Consumption; CWE-409. EPSS 0.37%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 23, 2026 · Go Vulnerability Database

    Detected

    ## Impact Echo v4's opt-in Decompress middleware exposed a gzip-decoded request stream without limiting its expanded size. A small compressed request could therefore produce a very large decoded body. Handlers that read or bind that body could consume excessive memory or CPU, and repeated or concurrent requests could cause denial of service. The middleware is not enabled by default. A limit on the

  2. Oct 28, 2026 · Go Vulnerability Database

    Fix available

    github.com/labstack/echo/v4 fixed in 4.16.1

  3. Oct 28, 2026 · Go Vulnerability Database

    Fix available

    github.com/labstack/echo/v4 fixed in 4.16.1

  4. Oct 28, 2026 · Go Vulnerability Database

    Updated

    ## Impact Echo v4's opt-in Decompress middleware exposed a gzip-decoded request stream without limiting its expanded size. A small compressed request could therefore produce a very large decoded body. Handlers that read or bind that body could consume excessive memory or CPU, and repeated or concurrent requests could cause denial of service. The middleware is not enabled by default. A limit on the

Sources

References

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 29, 2026
  • Go Vulnerability DatabaseOct 29, 2026