RHSA-2026:17461
Vulnerability from csaf_redhat - Published: 2026-05-14 06:53 - Updated: 2026-06-10 21:44urllib3 is an HTTP client library for Python. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. urllib3 can perform decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client. Applications and libraries are affected when they stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable redirects by setting `redirect=False` for requests to untrusted source.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Zero Trust Workload Identity Manager 1:registry.redhat.io/zero-trust-workload-identity-manager/spiffe-spire-oidc-discovery-provider-rhel9@sha256:47142dd4fefad52dcd1c749532f7de761bb9d463a9d90349c8987c769f3e3438_amd64 | — |
Vendor Fix
fix
|
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| Unresolved product id: Zero Trust Workload Identity Manager 1:registry.redhat.io/zero-trust-workload-identity-manager/spiffe-spire-oidc-discovery-provider-rhel9@sha256:9bc0f870faac5c6067d19d9f18a326278ca16936649cab980ca38545768ce7b2_arm64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: Zero Trust Workload Identity Manager 1:registry.redhat.io/zero-trust-workload-identity-manager/spiffe-spire-oidc-discovery-provider-rhel9@sha256:b325cd07a17b927b01b90c554586a6df21487d6630eb62c4dcb3e25e332e478e_s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: Zero Trust Workload Identity Manager 1:registry.redhat.io/zero-trust-workload-identity-manager/spiffe-spire-oidc-discovery-provider-rhel9@sha256:b96e8ef2d4e0697ddf666df6d7d0c54ecb18e708139ee408fadf9324d96bfa49_ppc64le | — |
Vendor Fix
fix
|
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"vulnerabilities": [
{
"cve": "CVE-2026-21441",
"cwe": {
"id": "CWE-409",
"name": "Improper Handling of Highly Compressed Data (Data Amplification)"
},
"discovery_date": "2026-01-07T23:01:59.422078+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2427726"
}
],
"notes": [
{
"category": "description",
"text": "urllib3 is an HTTP client library for Python. urllib3\u0027s streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. urllib3 can perform decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client. Applications and libraries are affected when they stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable redirects by setting `redirect=False` for requests to untrusted source.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"release_date": "2026-01-07T22:09:01.936000+00:00",
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"date": "2026-05-14T06:53:18+00:00",
"details": "Before installing the operator, make sure all previously released errata relevant to your system have been applied.\n\nThe steps to apply the upgraded images will differ depending on the installation plan approval policy that will be used\nwhile installing thezero trust workload identity manager for Red Hat OpenShift.\n\n- If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a\nnew version of the Operator. No further action is required to upgrade. This is the default setting.\n\n- If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator.",
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"title": "urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.