Red Hat Security Advisory: squid security update
Two denial of service vulnerabilities have been identified in the Squid proxy caching server related to ICP (Internet Cache Protocol) handling. These include a heap use-after-free vulnerability (CVE-2026-33526) and a denial of service via crafted ICP traffic (CVE-2026-32748). The vulnerabilities affect multiple Red Hat Enterprise Linux 9 variants and architectures. Red Hat has issued a security advisory with updated packages to address these issues. No CVSS score is provided, but the vendor rates the impact as Important. There are no known exploits in the wild at this time.
AI Analysis
Technical Summary
Red Hat Product Security has released an advisory (RHSA-2026:6301) addressing two denial of service vulnerabilities in Squid, a high-performance proxy caching server. 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 issues affect Red Hat Enterprise Linux 9 distributions across multiple architectures including x86_64, aarch64, s390x, and ppc64le. Updated Squid packages (version 5.5-22.el9_7.4) are available to remediate these vulnerabilities. The advisory classifies the security impact as Important. No CVSS scores are provided in the advisory or CVE records. No evidence of exploitation in the wild has been reported.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in Squid proxy servers by triggering heap use-after-free or by sending crafted ICP traffic. This could lead to service disruption for web clients relying on the proxy. The impact is limited to availability degradation and does not indicate code execution or data disclosure. Red Hat rates the security impact as Important.
Mitigation Recommendations
Red Hat has released updated Squid packages that fix these vulnerabilities. Users of affected Red Hat Enterprise Linux 9 versions should apply the security update as described in Red Hat advisory RHSA-2026:6301 and the referenced article https://access.redhat.com/articles/11258. Applying the official patch is the recommended remediation. No additional mitigation steps are indicated or required by the vendor.
Red Hat Security Advisory: squid security update
Description
Two denial of service vulnerabilities have been identified in the Squid proxy caching server related to ICP (Internet Cache Protocol) handling. These include a heap use-after-free vulnerability (CVE-2026-33526) and a denial of service via crafted ICP traffic (CVE-2026-32748). The vulnerabilities affect multiple Red Hat Enterprise Linux 9 variants and architectures. Red Hat has issued a security advisory with updated packages to address these issues. No CVSS score is provided, but the vendor rates the impact as Important. There are no known exploits in the wild at this time.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Red Hat Product Security has released an advisory (RHSA-2026:6301) addressing two denial of service vulnerabilities in Squid, a high-performance proxy caching server. 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 issues affect Red Hat Enterprise Linux 9 distributions across multiple architectures including x86_64, aarch64, s390x, and ppc64le. Updated Squid packages (version 5.5-22.el9_7.4) are available to remediate these vulnerabilities. The advisory classifies the security impact as Important. No CVSS scores are provided in the advisory or CVE records. No evidence of exploitation in the wild has been reported.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in Squid proxy servers by triggering heap use-after-free or by sending crafted ICP traffic. This could lead to service disruption for web clients relying on the proxy. The impact is limited to availability degradation and does not indicate code execution or data disclosure. Red Hat rates the security impact as Important.
Mitigation Recommendations
Red Hat has released updated Squid packages that fix these vulnerabilities. Users of affected Red Hat Enterprise Linux 9 versions should apply the security update as described in Red Hat advisory RHSA-2026:6301 and the referenced article https://access.redhat.com/articles/11258. Applying the official patch is the recommended remediation. No additional mitigation steps are indicated or required 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-2026:6301
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-33526"]
- Cvss Version
- null
Threat ID: 6a160983e29bf47b5064ff05
Added to database: 5/26/2026, 8:58:43 PM
Last enriched: 5/26/2026, 9:36:27 PM
Last updated: 5/27/2026, 5:04:05 AM
Views: 2
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.