CVE-2026-21441 (GCVE-0-2026-21441)
Vulnerability from cvelistv5 – Published: 2026-01-07 22:09 – Updated: 2026-06-30 03:15
VLAI
Title
urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)
Summary
urllib3 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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
114 references
Impacted products
136 products
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"timeline": [
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"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-01-07T22:09:01.936Z",
"value": "Made public."
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],
"title": "urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)",
"x_adpType": "supplier",
"x_generator": {
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"cna": {
"affected": [
{
"product": "urllib3",
"vendor": "urllib3",
"versions": [
{
"status": "affected",
"version": "\u003e= 1.22, \u003c 2.6.3"
}
]
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],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.9,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-409",
"description": "CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-07T22:13:57.482Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99"
},
{
"name": "https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b"
}
],
"source": {
"advisory": "GHSA-38jv-5279-wg99",
"discovery": "UNKNOWN"
},
"title": "urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-21441",
"datePublished": "2026-01-07T22:09:01.936Z",
"dateReserved": "2025-12-29T03:00:29.276Z",
"dateUpdated": "2026-06-30T03:15:34.329Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-21441",
"date": "2026-06-29",
"epss": "0.0068",
"percentile": "0.47756"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-21441\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-01-07T22:15:44.040\",\"lastModified\":\"2026-06-30T03:17:23.333\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"},{\"lang\":\"es\",\"value\":\"urllib3 es una biblioteca cliente HTTP para Python. La API de streaming de urllib3 est\u00e1 dise\u00f1ada para el manejo eficiente de grandes respuestas HTTP leyendo el contenido en fragmentos, en lugar de cargar el cuerpo completo de la respuesta en la memoria de una sola vez. urllib3 puede realizar decodificaci\u00f3n o descompresi\u00f3n bas\u00e1ndose en el encabezado HTTP \u0027Content-Encoding\u0027 (por ejemplo, \u0027gzip\u0027, \u0027deflate\u0027, \u0027br\u0027 o \u0027zstd\u0027). Al usar la API de streaming, la biblioteca descomprime solo los bytes necesarios, permitiendo el consumo parcial del contenido. A partir de la versi\u00f3n 1.22 y antes de la versi\u00f3n 2.6.3, para las respuestas de redirecci\u00f3n HTTP, la biblioteca leer\u00eda el cuerpo completo de la respuesta para vaciar la conexi\u00f3n y descomprimir el contenido innecesariamente. Esta descompresi\u00f3n ocurr\u00eda incluso antes de que se llamara a cualquier m\u00e9todo de lectura, y los l\u00edmites de lectura configurados no restring\u00edan la cantidad de datos descomprimidos. Como resultado, no hab\u00eda ninguna salvaguarda contra las bombas de descompresi\u00f3n. Un servidor malicioso podr\u00eda explotar esto para desencadenar un consumo excesivo de recursos en el cliente. Las aplicaciones y bibliotecas se ven afectadas cuando transmiten contenido de fuentes no confiables al establecer \u0027preload_content=False\u0027 cuando no deshabilitan las redirecciones. Los usuarios deber\u00edan actualizar al menos a urllib3 v2.6.3, en la cual la biblioteca no decodifica el contenido de las respuestas de redirecci\u00f3n cuando \u0027preload_content=False\u0027. Si la actualizaci\u00f3n no es posible de inmediato, deshabilite las redirecciones estableciendo \u0027redirect=False\u0027 para las solicitudes a fuentes no confiables.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"urllib3\",\"product\":\"urllib3\",\"versions\":[{\"version\":\"\u003e= 1.22, \u003c 2.6.3\",\"status\":\"affected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux Server HighAvailability (v. 7 ELS)\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:7::server\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux Server ResilientStorage (v. 7 ELS)\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:7::server\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat OpenStack Platform 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}
}
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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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