CVE catalog
CVE-2011-4096
squid3 - invalid memory deallocation
- Severity
- Unknown
- Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 37.19% · Oct 25, 2026
The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record. squid: Invalid free by processing CNAME DNS record pointing to another CNAME record pointing to an empty A-record This issue did not affect the versions of squid as shipped with Red Hat Enterprise Linux 4 and 5 as they did not include IPv6 support. This issue was introduced with the addition of IPv6 support in Squid 3.1 (in the changes made to the idnsGrokReply function). The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | squid3 | 6.0 | 3.1.6-1.2 | vulnerable |
| Debian | squid3 | 6.0 | 3.1.6-1.2+squeeze1 | vulnerable |
| Debian | squid3 | 6.0 | 3.1.6-1.2+squeeze2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | squid3 | deb | 6.0 | 3.1.6-1.2+squeeze2 | Not reported | DSA-2381-1 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed: