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Sliver has Potential Zip Bomb Denial of Service in GzipEncoderGHSA-2phg-qgmm-r638

Fix: BishopFox/sliver@0cf5a47

GHSA-2phg-qgmm-r638 is a security vulnerability in github.com/bishopfox/sliver. A fix is available for github.com/bishopfox/sliver — see the affected versions and patch details below.

Also known asGO-2026-4548
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Feb 28, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐹github.com/bishopfox/sliver

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

Summary

GzipEncoder does not limit output size when processing compressed data. This allows unauthenticated remote attackers to crash sliver server by sending a http request with highly compressed gzip data (aka zip bomb).

Details

In util/encoders/gzip.go, Decode() method decompresses given data by reading the entire gzip buffer at once without limiting output size.

PoC

data = gzip.compress(bytes(1024 * 1024 * 1024)) * 16
requests.post(f"http://172.17.0.2/{nonce}", data=data)

Impact

Unauthenticated remote attackers can exhaust memory and cpu resource of sliver server and crash it when they have GzipEncoderID, which can be easily retrived from implant's http traffic, or by brute-forcing.

A fixed version is available at https://github.com/BishopFox/sliver/releases/tag/v1.7.2.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/bishopfox/sliverall versions1.7.2go get github.com/bishopfox/sliver@v1.7.2

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update github.com/bishopfox/sliver to 1.7.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2phg-qgmm-r638 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Summary GzipEncoder does not limit output size when processing compressed data. This allows unauthenticated remote attackers to crash sliver server by sending a http request with highly compressed gzip data (aka zip bomb). ### Details In `util/encoders/gzip.go`, `Decode()` method decompresses given data by reading the entire gzip buffer at once without limiting output size. ### PoC ```python data = gzip.compress(bytes(1024 * 1024 * 1024)) * 16 requests.post(f"http://172.17.0.2/{nonce}", data=data) ``` ### Impact Unauthenticated remote attackers can exhaust memory and cpu resource of
O3 Security · Impact-Aware SCA

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