RHSA-2026:34119
Vulnerability from csaf_redhat - Published: 2026-07-01 09:00 - Updated: 2026-07-13 05:10Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
python-rpds-py:
* python3-rpds-py-2026.6.3-1.hum1 (aarch64, x86_64)
* python-rpds-py-2026.6.3-1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in urllib3, an HTTP client library for Python. When using the low-level API via `ProxyManager.connection_from_url().urlopen()` with `assert_same_host=False`, cross-origin redirects can still forward sensitive headers. This could allow a remote attacker to gain unauthorized access to sensitive information.
5.9 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:python-rpds-py-main@aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python-rpds-py-main@src | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:python-rpds-py-main@x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
A flaw was found in the idna library, which handles Internationalized Domain Names in Python applications. A remote attacker could exploit this vulnerability by sending specially crafted, excessively long inputs to the library's encoding function. This could cause the system to consume significant resources, leading to a Denial of Service (DoS), where the affected application becomes unavailable to legitimate users. This issue stems from an incomplete fix for a previously identified vulnerability.
5.3 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:python-rpds-py-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python-rpds-py-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python-rpds-py-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
16 references
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"name": "Insertion of Sensitive Information Into Sent Data"
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"text": "A flaw was found in urllib3, an HTTP client library for Python. When using the low-level API via `ProxyManager.connection_from_url().urlopen()` with `assert_same_host=False`, cross-origin redirects can still forward sensitive headers. This could allow a remote attacker to gain unauthorized access to sensitive information.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "urllib3: urllib3: Information disclosure via cross-origin redirects forwarding sensitive headers",
"title": "Vulnerability summary"
},
{
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"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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"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:python-rpds-py-main@aarch64",
"Red Hat Hardened Images:python-rpds-py-main@src",
"Red Hat Hardened Images:python-rpds-py-main@x86_64"
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"availabilityImpact": "NONE",
"baseScore": 5.9,
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"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
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"title": "urllib3: urllib3: Information disclosure via cross-origin redirects forwarding sensitive headers"
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"ids": [
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"notes": [
{
"category": "description",
"text": "A flaw was found in the idna library, which handles Internationalized Domain Names in Python applications. A remote attacker could exploit this vulnerability by sending specially crafted, excessively long inputs to the library\u0027s encoding function. This could cause the system to consume significant resources, leading to a Denial of Service (DoS), where the affected application becomes unavailable to legitimate users. This issue stems from an incomplete fix for a previously identified vulnerability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "python-idna: idna: Denial of Service via specially crafted long inputs",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A flaw was found in the python-idna library. This is an incomplete fix for CVE-2024-3651. The idna.encode() function performs contextual validation checks (valid_contexto) before rejecting oversized inputs, allowing specially crafted long payloads to cause excessive CPU consumption and lead to a denial of service. The fix in version 3.14 rejects long inputs early before further processing, and version 3.15 extends this approach to alternate per-label conversion and codec functions.",
"title": "Statement"
},
{
"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"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:python-rpds-py-main@aarch64",
"Red Hat Hardened Images:python-rpds-py-main@src",
"Red Hat Hardened Images:python-rpds-py-main@x86_64"
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45409"
},
{
"category": "external",
"summary": "https://github.com/kjd/idna/security/advisories/GHSA-65pc-fj4g-8rjx",
"url": "https://github.com/kjd/idna/security/advisories/GHSA-65pc-fj4g-8rjx"
}
],
"release_date": "2026-06-05T22:06:07.082000+00:00",
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{
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"date": "2026-07-01T09:00:32+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:python-rpds-py-main@aarch64",
"Red Hat Hardened Images:python-rpds-py-main@src",
"Red Hat Hardened Images:python-rpds-py-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:34119"
},
{
"category": "workaround",
"details": "To mitigate this denial-of-service vulnerability, applications utilizing the `idna` Python library should implement input validation to ensure that domain names do not exceed the standard 253-character length limit before being passed to the `idna.encode()` function. This operational control prevents the processing of excessively long inputs that could lead to resource exhaustion and service unavailability.\n\nApplications that pass user-controlled data directly to `idna.encode()` without validation checks (e.g.: DNS length \u003c 254 chars) are affected.",
"product_ids": [
"Red Hat Hardened Images:python-rpds-py-main@aarch64",
"Red Hat Hardened Images:python-rpds-py-main@src",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"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:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:python-rpds-py-main@aarch64",
"Red Hat Hardened Images:python-rpds-py-main@src",
"Red Hat Hardened Images:python-rpds-py-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "python-idna: idna: Denial of Service via specially crafted long inputs"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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