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CVE-2026-84382 (GCVE-0-2026-84382)

Vulnerability from nvd – Published: 2026-09-02 18:03 – Updated: 2026-09-03 14:31

Title

HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)

Summary

HTTPX2 is a next generation HTTP client for Python. Prior to 2.12.0, the HTTPX2 content decoders in src/httpx2/httpx2/_decoders.py fully inflate each gzip, deflate, br, or zstd network chunk before iter_bytes() or aiter_bytes() yields bounded pieces to the application. A 64 KiB compressed chunk can expand to approximately 64 MiB in one intermediate allocation, so an attacker-controlled or compromised server can cause severe memory pressure or out-of-memory process termination even when the application streams the response. This issue is fixed in version 2.12.0.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-03 14:09 UTC

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1126	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/4fd0c70…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.12.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pydantic	httpx2	Affected: < 2.12.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-84381 (GCVE-0-2026-84381)

Vulnerability from nvd – Published: 2026-09-02 18:01 – Updated: 2026-09-05 01:03

Title

HTTPX2: Secure WebSocket traffic sent without TLS through SOCKS proxies

Summary

HTTPX2 is a next generation HTTP client for Python. Prior to 2.10.0, httpcore2 fails to start TLS in src/httpcore2/httpcore2/_sync/socks_proxy.py and src/httpcore2/httpcore2/_async/socks_proxy.py when the remote origin uses wss through a SOCKS5 proxy because the TLS upgrade condition only recognizes https. HTTPX2 exposes the flaw through Client.websocket() and AsyncClient.websocket() from 2.6.0 through 2.9.1, so the opening handshake, query parameters, Authorization headers, cookies, and subsequent frames can cross the proxy path in plaintext without certificate verification. An attacker controlling or observing that path can read or modify traffic and impersonate the WebSocket server. This issue is fixed in httpcore2 2.10.0 and HTTPX2 2.10.0.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-05 01:03 UTC

CWE

CWE-319 - Cleartext Transmission of Sensitive Information

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1104	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/fb008dd…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.10.0	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
pydantic	httpx2	Affected: >= 2.6.0, < 2.10.0
pydantic	httpcore2	Affected: < 2.10.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-84380 (GCVE-0-2026-84380)

Vulnerability from nvd – Published: 2026-09-02 17:58 – Updated: 2026-09-02 18:07

Title

HTTPX2: Conflicting Content-Length and Transfer-Encoding headers can be auto-generated

Summary

HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, Request._prepare() in src/httpx2/httpx2/_models.py can add a body-derived Content-Length header to a request that already contains a caller-supplied Transfer-Encoding header because its setdefault() processing checks each default header independently rather than treating the two framing headers as mutually exclusive. Fixed-size byte, JSON, form, and known-length multipart bodies can therefore be serialized over HTTP/1.1 with both headers, allowing request smuggling or connection desynchronization when downstream intermediaries disagree about which framing header takes precedence. This issue is fixed in version 2.11.0.

Severity

5.6 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 18:07 UTC

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1137	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/829b93a…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.11.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pydantic	httpx2	Affected: < 2.11.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-84379 (GCVE-0-2026-84379)

Vulnerability from nvd – Published: 2026-09-02 17:57 – Updated: 2026-09-02 18:20

Title

HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers

Summary

HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, content, content_type) tuple and the files= four-element (filename, content, content_type, headers) tuple into multipart/form-data part headers without validating header names or values. CR or LF characters can terminate a part header, inject additional part headers, or end the part header block early, allowing a downstream multipart parser to treat attacker-supplied lines as genuine headers and potentially alter part semantics or bypass header-based checks. This issue is fixed in version 2.11.0.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 18:20 UTC

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1142	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/de96d81…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.11.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pydantic	httpx2	Affected: < 2.11.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-84378 (GCVE-0-2026-84378)

Vulnerability from nvd – Published: 2026-09-02 17:54 – Updated: 2026-09-02 19:00

Title

HTTPX2: Quadratic SSE line buffering can cause CPU denial of service

Summary

HTTPX2 is a next generation HTTP client for Python. From 2.5.0 until 2.10.0, the HTTPX2 Server-Sent Events parser in src/httpx2/httpx2/_sse.py repeatedly copies and rescans buffered text in _SSELineDecoder.decode() when an attacker-controlled or compromised SSE endpoint splits one unterminated line across many response chunks. The behavior affects httpx2.Client.sse() and httpx2.AsyncClient.sse(), and the total processing work grows quadratically with the line length, allowing a crafted stream to consume excessive CPU and block a synchronous worker or asynchronous event loop. This issue is fixed in version 2.10.0.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 19:00 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1071	x_refsource_MISC
https://github.com/pydantic/httpx2/pull/1117	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/cbfc0e0…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.10.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pydantic	httpx2	Affected: >= 2.5.0, < 2.10.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-84382 (GCVE-0-2026-84382)

Vulnerability from cvelistv5 – Published: 2026-09-02 18:03 – Updated: 2026-09-03 14:31

Title

HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)

Summary

HTTPX2 is a next generation HTTP client for Python. Prior to 2.12.0, the HTTPX2 content decoders in src/httpx2/httpx2/_decoders.py fully inflate each gzip, deflate, br, or zstd network chunk before iter_bytes() or aiter_bytes() yields bounded pieces to the application. A 64 KiB compressed chunk can expand to approximately 64 MiB in one intermediate allocation, so an attacker-controlled or compromised server can cause severe memory pressure or out-of-memory process termination even when the application streams the response. This issue is fixed in version 2.12.0.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-03 14:09 UTC

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1126	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/4fd0c70…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.12.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pydantic	httpx2	Affected: < 2.12.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-84381 (GCVE-0-2026-84381)

Vulnerability from cvelistv5 – Published: 2026-09-02 18:01 – Updated: 2026-09-05 01:03

Title

HTTPX2: Secure WebSocket traffic sent without TLS through SOCKS proxies

Summary

HTTPX2 is a next generation HTTP client for Python. Prior to 2.10.0, httpcore2 fails to start TLS in src/httpcore2/httpcore2/_sync/socks_proxy.py and src/httpcore2/httpcore2/_async/socks_proxy.py when the remote origin uses wss through a SOCKS5 proxy because the TLS upgrade condition only recognizes https. HTTPX2 exposes the flaw through Client.websocket() and AsyncClient.websocket() from 2.6.0 through 2.9.1, so the opening handshake, query parameters, Authorization headers, cookies, and subsequent frames can cross the proxy path in plaintext without certificate verification. An attacker controlling or observing that path can read or modify traffic and impersonate the WebSocket server. This issue is fixed in httpcore2 2.10.0 and HTTPX2 2.10.0.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-05 01:03 UTC

CWE

CWE-319 - Cleartext Transmission of Sensitive Information

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1104	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/fb008dd…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.10.0	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
pydantic	httpx2	Affected: >= 2.6.0, < 2.10.0
pydantic	httpcore2	Affected: < 2.10.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-84380 (GCVE-0-2026-84380)

Vulnerability from cvelistv5 – Published: 2026-09-02 17:58 – Updated: 2026-09-02 18:07

Title

HTTPX2: Conflicting Content-Length and Transfer-Encoding headers can be auto-generated

Summary

HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, Request._prepare() in src/httpx2/httpx2/_models.py can add a body-derived Content-Length header to a request that already contains a caller-supplied Transfer-Encoding header because its setdefault() processing checks each default header independently rather than treating the two framing headers as mutually exclusive. Fixed-size byte, JSON, form, and known-length multipart bodies can therefore be serialized over HTTP/1.1 with both headers, allowing request smuggling or connection desynchronization when downstream intermediaries disagree about which framing header takes precedence. This issue is fixed in version 2.11.0.

Severity

5.6 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 18:07 UTC

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1137	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/829b93a…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.11.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pydantic	httpx2	Affected: < 2.11.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-84379 (GCVE-0-2026-84379)

Vulnerability from cvelistv5 – Published: 2026-09-02 17:57 – Updated: 2026-09-02 18:20

Title

HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers

Summary

HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, content, content_type) tuple and the files= four-element (filename, content, content_type, headers) tuple into multipart/form-data part headers without validating header names or values. CR or LF characters can terminate a part header, inject additional part headers, or end the part header block early, allowing a downstream multipart parser to treat attacker-supplied lines as genuine headers and potentially alter part semantics or bypass header-based checks. This issue is fixed in version 2.11.0.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 18:20 UTC

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1142	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/de96d81…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.11.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pydantic	httpx2	Affected: < 2.11.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-84378 (GCVE-0-2026-84378)

Vulnerability from cvelistv5 – Published: 2026-09-02 17:54 – Updated: 2026-09-02 19:00

Title

HTTPX2: Quadratic SSE line buffering can cause CPU denial of service

Summary

HTTPX2 is a next generation HTTP client for Python. From 2.5.0 until 2.10.0, the HTTPX2 Server-Sent Events parser in src/httpx2/httpx2/_sse.py repeatedly copies and rescans buffered text in _SSELineDecoder.decode() when an attacker-controlled or compromised SSE endpoint splits one unterminated line across many response chunks. The behavior affects httpx2.Client.sse() and httpx2.AsyncClient.sse(), and the total processing work grows quadratically with the line length, allowing a crafted stream to consume excessive CPU and block a synchronous worker or asynchronous event loop. This issue is fixed in version 2.10.0.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 19:00 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/pydantic/httpx2/security/advis…	x_refsource_CONFIRM
https://github.com/pydantic/httpx2/pull/1071	x_refsource_MISC
https://github.com/pydantic/httpx2/pull/1117	x_refsource_MISC
https://github.com/pydantic/httpx2/commit/cbfc0e0…	x_refsource_MISC
https://github.com/pydantic/httpx2/releases/tag/v2.10.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pydantic	httpx2	Affected: >= 2.5.0, < 2.10.0

Show details on NVD website

JSON

To clipboard

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Find a vulnerability

Search criteria

10 vulnerabilities found for httpx2 by pydantic

CVE-2026-84382 (GCVE-0-2026-84382)

CVE-2026-84381 (GCVE-0-2026-84381)

CVE-2026-84380 (GCVE-0-2026-84380)

CVE-2026-84379 (GCVE-0-2026-84379)

CVE-2026-84378 (GCVE-0-2026-84378)

CVE-2026-84382 (GCVE-0-2026-84382)

CVE-2026-84381 (GCVE-0-2026-84381)

CVE-2026-84380 (GCVE-0-2026-84380)

CVE-2026-84379 (GCVE-0-2026-84379)

CVE-2026-84378 (GCVE-0-2026-84378)