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TI-2026-57993 Aliases CVE-2026-84382GHSA-8xx6-hgc6-gc2m

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

Priority MEDIUM 40CWE-409Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 3 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0063 50th percentileScored 2026-11-07
Fix Partial httpx2 (pydantic): 2.12.0httpx2 (PyPI): 2.12.0Red Hat: 8 advisoriesRed Hat: 3 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
pydantichttpx2before 2.12.02.12.0Patch availableCNA
—httpx2 (PyPI)before 2.12.02.12.0Patch availableGHSA-8xx6-hgc6-gc2m
  • httpx2 Vendorpydantic Affected before 2.12.0 Fixed in 2.12.0 Patch available CNA
  • httpx2 (PyPI) Vendor— Affected before 2.12.0 Fixed in 2.12.0 Patch available GHSA-8xx6-hgc6-gc2m

Remediation

  • Fix · CNA httpx2 (pydantic) Fixed in 2.12.0
  • Fix · GHSA-8xx6-hgc6-gc2m httpx2 (PyPI) Fixed in 2.12.0 Advisory →

Red Hat 8 advisories

  • RHSA-2026:92452 Released 2026-10-29 · Red Hat rating Critical
    Red Hat Enterprise Linux AI 3.5.2 enhancement update
    • Red Hat Enterprise Linux AI 3.5 registry.redhat.io/rhelai3/bootc-aws-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-rocm-rhel9 +3
  • RHSA-2026:92449 Released 2026-10-29 · Red Hat rating Critical
    Red Hat Enterprise Linux AI 3.5.2 enhancement update
    • Red Hat Enterprise Linux AI 3.5 registry.redhat.io/rhelai3/disk-image-cuda-rhel9
  • RHSA-2026:86891 Released 2026-10-21 · Red Hat rating Critical
    RHOAI 3.5.2 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.5 registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-cli-rhel9 +47
Show 5 more Red Hat advisories
  • RHSA-2026:82415 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference 3.5.2 (cpu)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-cpu-rhel9
  • RHSA-2026:82371 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference 3.5.2 (spyre)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-spyre-rhel9
  • RHSA-2026:82368 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference 3.5.2 (cuda)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-cuda-rhel9
  • RHSA-2026:82061 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference Tech Preview 3.5.2 (Gaudi)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-gaudi-rhel9
  • RHSA-2026:82059 Released 2026-10-13 · Red Hat rating Critical
    Red Hat AI Inference 3.5.2 (ROCm)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-rocm-rhel9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Lightspeed CoreAffectedNo fix yet
Red Hat AI Inference Server 3.5Fixed RHSA-2026:82059, RHSA-2026:82061, RHSA-2026:82368, RHSA-2026:82371, RHSA-2026:82415
Red Hat Enterprise Linux AI 3.5Fixed RHSA-2026:92449, RHSA-2026:92452
Red Hat OpenShift AI 3.5Fixed RHSA-2026:86891
Not affected: 6 products
  • Exploit Intelligence
  • Migration Toolkit for Applications 8
  • OpenShift Lightspeed
  • Red Hat Enterprise Linux command line assistant
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift AI 3.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84382
  2. 2026-10-03 Alias added: GHSA-8xx6-hgc6-gc2m
  3. 2026-10-13 Fix available: RHSA-2026:82061 · Red Hat
  4. 2026-10-13 Fix available: RHSA-2026:82059 · Red Hat
  5. 2026-10-13 Fix available: Red Hat AI Inference Server 3.5 · Red Hat
  6. 2026-10-14 Fix available: RHSA-2026:82368 · Red Hat
  7. 2026-10-14 Fix available: RHSA-2026:82415 · Red Hat
  8. 2026-10-14 Fix available: RHSA-2026:82371 · Red Hat
  9. 2026-10-15 Affected versions changed · Red Hat
  10. 2026-10-21 Affected versions changed · Red Hat
  11. 2026-10-22 Fix available: RHSA-2026:86891 · Red Hat
  12. 2026-10-22 Fix available: Red Hat OpenShift AI 3.5 · Red Hat
  13. 2026-10-23 Affected versions changed · Red Hat
  14. 2026-10-28 EPSS moved to the 50th–90th percentile
  15. 2026-10-30 Fix available: RHSA-2026:92452 · Red Hat
  16. 2026-10-30 Fix available: RHSA-2026:92449 · Red Hat
  17. 2026-10-30 Fix available: Red Hat Enterprise Linux AI 3.5 · Red Hat

References

Advisory 1

Other 5

  • TI-2024-03518 Regular expression denial of service in Pydantic < 2.4.0 CVSS 3.1HIGH 7.5
  • TI-2026-57990 HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers CVSS 3.1MEDIUM 5.3
  • TI-2026-41916 Path traversal in pydantic-settings CVSS 3.1MEDIUM 5.3
  • TI-2026-20687 Pydantic AI Affected by Server-Side Request Forgery (SSRF) in URL Download Handling CVSS 3.1HIGH 8.6
  • TI-2026-69551 Pydantic AI keeps concurrency slots after streams end early CVSS 3.1HIGH 7.5
  • TI-2026-57992 HTTPX2: Secure WebSocket traffic sent without TLS through SOCKS proxies CVSS 3.1HIGH 8.1
See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences