VDB
RHSA-2026%3A2126
RHSA-2026%3A2126
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 | registry.redhat.io/rhtas/tuffer-rhel9@sha256:89c686659b2276825a7109717ec3326b7a2054d48dae50ae41407744ae26d1aa_amd64 as a component of Red Hat Trusted Artifact Signer 1.3 | registry.redhat.io/rhtas/tuffer-rhel9@sha256:89c686659b2276825a7109717ec3326b7a2054d48dae50ae41407744ae26d1aa_amd64, registry.redhat.io/rhtas/tuffer-rhel9@sha256:89c686659b2276825a7109717ec3326b7a2054d48dae50ae41407744ae26d1aa_amd64, * |
| urllib3 | urllib3 | |
| Red Hat | registry.redhat.io/rhtas/tuffer-rhel9@sha256:89c686659b2276825a7109717ec3326b7a2054d48dae50ae41407744ae26d1aa_amd64 as a component of Red Hat Trusted Artifact Signer 1.3 | *, registry.redhat.io/rhtas/tuffer-rhel9@sha256:89c686659b2276825a7109717ec3326b7a2054d48dae50ae41407744ae26d1aa_amd64, registry.redhat.io/rhtas/tuffer-rhel9@sha256:89c686659b2276825a7109717ec3326b7a2054d48dae50ae41407744ae26d1aa_amd64 |
| Red Hat | registry.redhat.io/rhtas/tuftool-rhel9@sha256:be5fa59dc9427896d01b73b547f6ab6cd3d4726e8d8bc02e997addde392861ef_amd64 as a component of Red Hat Trusted Artifact Signer 1.3 | registry.redhat.io/rhtas/tuftool-rhel9@sha256:be5fa59dc9427896d01b73b547f6ab6cd3d4726e8d8bc02e997addde392861ef_amd64, registry.redhat.io/rhtas/tuftool-rhel9@sha256:be5fa59dc9427896d01b73b547f6ab6cd3d4726e8d8bc02e997addde392861ef_amd64, registry.redhat.io/rhtas/tuftool-rhel9@sha256:be5fa59dc9427896d01b73b547f6ab6cd3d4726e8d8bc02e997addde392861ef_amd64 |
| Red Hat | registry.redhat.io/rhtas/tuftool-rhel9@sha256:be5fa59dc9427896d01b73b547f6ab6cd3d4726e8d8bc02e997addde392861ef_amd64 as a component of Red Hat Trusted Artifact Signer 1.3 | registry.redhat.io/rhtas/tuftool-rhel9@sha256:be5fa59dc9427896d01b73b547f6ab6cd3d4726e8d8bc02e997addde392861ef_amd64, registry.redhat.io/rhtas/tuftool-rhel9@sha256:be5fa59dc9427896d01b73b547f6ab6cd3d4726e8d8bc02e997addde392861ef_amd64, * |
Exploit Intelligence
- sarif.json (github-poc)
- pem_10.3.1_rel_notes.yml (github-poc)
- 4628.1.0.yml (github-poc)
- 2-cuda12.6.yaml (github-poc)
- converter.go (github-poc)
- oval_test.go (github-poc)
- vulnerability_matcher_validation_test.go (github-poc)
- converter_test.go (github-poc)
- config.py (github-poc)
- setup.py (github-poc)
…and 4 more exploits
Timeline
- Feb 5, 2026 CVE Published
- Apr 24, 2026 Distribution Patch
- Apr 24, 2026 Distribution Patch
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Jun 22, 2026 CVE Updated
References
- https://access.redhat.com/errata/RHSA-2026:2126 advisory
- https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.3 advisory
- https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.3/html-single/release_notes/index advisory
- https://access.redhat.com/security/cve/CVE-2025-66418 advisory
- https://access.redhat.com/security/cve/CVE-2025-66471 advisory
- https://access.redhat.com/security/cve/CVE-2026-21441 advisory
- https://access.redhat.com/security/updates/classification/ advisory
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_2126.json advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2419455 issue
- 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://bugzilla.redhat.com/show_bug.cgi?id=2419467 issue
- 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://bugzilla.redhat.com/show_bug.cgi?id=2427726 issue
- https://www.cve.org/CVERecord?id=CVE-2026-21441 advisory
…and 3 more