CVE-2023-49286 Denial of Service in Helper Process management
Attackers can cause a denial of service in Squid proxy by exploiting incorrect return value checks in helper process management.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-49286?
CVE-2023-49286 is a high-severity denial of service vulnerability in Squid-Cache Squid, published on 4 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to an Incorrect Check of Function Return Value bug Squid is vulnerable to a Denial of Service attack against its Helper process management. This bug is fixed by Squid version 6.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Which versions are affected by CVE-2023-49286?
It affects 1 product.
Products include Squid-Cache Squid.
How do I fix CVE-2023-49286?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-49286 being exploited?
There is no known exploitation of CVE-2023-49286 in the wild and no public exploit code.
Other vulnerabilities in Squid-Cache Squid
- CVE-2025-62168 Squid vulnerable to information disclosure via authentication credential leakage in error handling
- CVE-2025-54574 Squid's URN Handling can lead to Buffer Overflow
- CVE-2026-33526 Squid vulnerable to Denial of Service in ICP Request handling
- CVE-2026-32748 Squid has Denial of Service in ICP Response handling
- CVE-2023-50269 SQUID-2023:10 Denial of Service in HTTP Request parsing
Sources
Also known as ALPINE-CVE-2023-49286, AZL-32074, DEBIAN-CVE-2023-49286, GHSA-xggx-9329-3c27, ROOT-OS-ALPINE-318-CVE-2023-49286, UBUNTU-CVE-2023-49286.