Red Hat Security Advisory: squid:4 security update
Two denial of service vulnerabilities have been identified in Squid, a high-performance proxy caching server. These vulnerabilities involve a heap use-after-free issue and crafted ICP traffic handling, which can cause service disruption. The issues affect Red Hat Enterprise Linux 8.4 AppStream AUS and EUS EXTENSION versions. Red Hat has issued a security advisory with updates to address these vulnerabilities.
AI Analysis
Technical Summary
Red Hat Product Security has published an important security advisory (RHSA-2026:20564) addressing two denial of service vulnerabilities in Squid 4 used in Red Hat Enterprise Linux 8.4 AppStream AUS and EUS EXTENSION. The first vulnerability (CVE-2026-33526) is a heap use-after-free in ICP handling, and the second (CVE-2026-32748) involves denial of service via crafted ICP traffic. These vulnerabilities could cause the Squid proxy service to crash or become unavailable. The advisory provides updated packages to remediate these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in Squid proxy servers, leading to service interruption. There is no indication of remote code execution or data compromise. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Red Hat has released updated packages for Squid 4 in Red Hat Enterprise Linux 8.4 AppStream AUS and EUS EXTENSION to fix these vulnerabilities. Users should apply the security update as described in the Red Hat advisory RHSA-2026:20564 and the referenced article https://access.redhat.com/articles/11258. Patch status is confirmed as available. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: squid:4 security update
Description
Two denial of service vulnerabilities have been identified in Squid, a high-performance proxy caching server. These vulnerabilities involve a heap use-after-free issue and crafted ICP traffic handling, which can cause service disruption. The issues affect Red Hat Enterprise Linux 8.4 AppStream AUS and EUS EXTENSION versions. Red Hat has issued a security advisory with updates to address these vulnerabilities.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Red Hat Product Security has published an important security advisory (RHSA-2026:20564) addressing two denial of service vulnerabilities in Squid 4 used in Red Hat Enterprise Linux 8.4 AppStream AUS and EUS EXTENSION. The first vulnerability (CVE-2026-33526) is a heap use-after-free in ICP handling, and the second (CVE-2026-32748) involves denial of service via crafted ICP traffic. These vulnerabilities could cause the Squid proxy service to crash or become unavailable. The advisory provides updated packages to remediate these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in Squid proxy servers, leading to service interruption. There is no indication of remote code execution or data compromise. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Red Hat has released updated packages for Squid 4 in Red Hat Enterprise Linux 8.4 AppStream AUS and EUS EXTENSION to fix these vulnerabilities. Users should apply the security update as described in the Red Hat advisory RHSA-2026:20564 and the referenced article https://access.redhat.com/articles/11258. Patch status is confirmed as available. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:20564
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-33526"]
- Cvss Version
- null
Threat ID: 6a16097be29bf47b50647bd3
Added to database: 05/26/2026, 20:58:35 UTC
Last enriched: 06/28/2026, 00:20:30 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 41
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.