VDB
RHSA-2026%3A28043
RHSA-2026%3A28043
PUBLISHED
CVSS 7.5 HIGH
A flaw was found in urllib3 Python library that could lead to a Denial of Service condition. A remote, malicious server can exploit this flaw by responding to a client request with an HTTP message that uses an excessive number of chained compression algorithms. This unlimited decompression chain causes the client system to consume a virtually unbounded amount of CPU resources and memory. The high resource usage leads to service disruption, making the application unresponsive.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | python-urllib3 | |
| Red Hat | python-urllib3-0:1.26.5-3.el8ost.3.src as a component of Red Hat OpenStack Platform 17.1 | 1.26.5-3.el8ost.3.src, 1.26.5-3.el8ost.3.src, 1.26.5-3.el8ost.3.src |
| Red Hat | python3-urllib3-0:1.26.5-3.el8ost.3.noarch as a component of Red Hat OpenStack Platform 17.1 | 1.26.5-3.el8ost.3.noarch, 1.26.5-3.el8ost.3.noarch, 1.26.5-3.el8ost.3.noarch |
Timeline
- Jun 22, 2026 CVE Published
- Jul 4, 2026 Distribution Patch
- Jul 4, 2026 Distribution Patch
- Jul 4, 2026 Security Advisory
- Jul 4, 2026 Security Advisory
- Jul 4, 2026 Security Advisory
- Jul 4, 2026 Security Advisory
- Jul 13, 2026 CVE Updated
References
- https://access.redhat.com/errata/RHSA-2026:28043 advisory
- https://access.redhat.com/security/updates/classification/#important advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2419455 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2419467 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2427726 issue
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_28043.json advisory
- https://access.redhat.com/security/cve/CVE-2025-66418 advisory
- https://www.cve.org/CVERecord?id=CVE-2025-66418 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-66418 advisory
- https://github.com/urllib3/urllib3/commit/24d7b67eac89f94e11003424bcf0d8f7b72222a8 advisory
- https://github.com/urllib3/urllib3/security/advisories/GHSA-gm62-xv2j-4w53 advisory
- https://access.redhat.com/security/cve/CVE-2025-66471 advisory
- https://www.cve.org/CVERecord?id=CVE-2025-66471 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-66471 advisory
- https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716ed7 advisory
- https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37 advisory
- https://access.redhat.com/security/cve/CVE-2026-21441 advisory
- https://www.cve.org/CVERecord?id=CVE-2026-21441 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-21441 advisory
- https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b advisory
…and 1 more