---
title: "Security digest: October 11, 2023"
url: https://erroneo.us/security/2023-10-11/
description: "October 11, 2023 vulnerability digest: 1 brief (curl SOCKS5 Heap Overflow: Hyped, but Narrow in…); 1 critical advisory (Maven). What to patch and who can…"
type: security-digest-day
section: "Security Digest"
date_published: 2023-10-11
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: October 11, 2023

1 editorial brief and 1 critical advisory.

## Take stock

- Most can relax: curl SOCKS5 Heap Overflow: Hyped, but Narrow in Practice . Software that sends libcurl 7.69.0 to 8.3.0 traffic through socks5h:// (remote-resolve) proxies to URLs or redirects an attacker can influence, especially on old 7.x builds.
- Maven: 1 critical advisory ( org.apache.zookeeper:zookeeper ). Check with mvn dependency:tree -Dincludes=<groupId>:<artifactId> .
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Editorial briefs

- **Most can relax** [curl SOCKS5 Heap Overflow: Hyped, but Narrow in Practice](https://erroneo.us/security/briefs/curl-socks5-heap-overflow-cve-2023-38545/index.md): Pre-announced as the worst curl flaw in a long time, the bug only bites when libcurl uses a SOCKS5 proxy with remote name resolution and an attacker can supply a very long hostname; take 8.4.0 or later in normal patching, and hurry only if that proxy setup applies to you.

## Known exploited (CISA KEV)

None.

## Critical advisories

- [CVE-2023-44981](https://erroneo.us/security/cve/CVE-2023-44981/index.md) Authorization Bypass Through User-Controlled Key vulnerability in Apache ZooKeeper — Maven org.apache.zookeeper:zookeeper < 3.7.2 → 3.7.2; Maven org.apache.zookeeper:zookeeper >= 3.8.0, < 3.8.3 → 3.8.3; Maven org.apache.zookeeper:zookeeper >= 3.9.0, < 3.9.1 → 3.9.1

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Source page: https://erroneo.us/security/2023-10-11/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt