EUVD-2026-70251
GHSA-8xx6-hgc6-gc2m
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable via any HTTP server response; no credentials or user interaction required; impact is availability-only with no data exposure.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
6Blast Radius
ecosystem impact- 43,402 pypi packages depend on httpx2 (449 direct, 43,077 indirect)
Ecosystem-wide dependent count for version 2.12.0.
DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Memory exhaustion via unbounded decompression in HTTPX2 (all versions before 2.12.0) allows any HTTP server the client contacts to cause severe memory pressure or out-of-memory process termination by returning a crafted compressed response body. The content decoders in _decoders.py call decompress() without a size cap, so a single 64 KiB compressed chunk can inflate to approximately 64 MiB in one allocation across gzip, deflate, brotli, and zstd encodings - all enabled by default. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the HTTPX2 client to make an HTTP request to an attacker-controlled or compromised server that returns a response body encoded with gzip, deflate, brotli, or zstd (any encoding HTTPX2 decodes by default). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately reflects a trivially-reachable, unauthenticated availability attack with no confidentiality or integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade HTTPX2 to version 2.12.0 or later, as confirmed by the tagged release at https://github.com/pydantic/httpx2/releases/tag/v2.12.0 and security advisory GHSA-8xx6-hgc6-gc2m. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify and inventory all applications and services using HTTPX2 across your infrastructure. …
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Vendor StatusVendor
SUSE
Severity: ImportantShare
External POC / Exploit Code
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