CVE-2026-84382

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Sep 2, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v2.12.0

Patch available: pydantic/httpx2 v2.12.0

https://github.com/pydantic/httpx2/releases/tag/v2.12.0
github_commit Patch Available

commit 4fd0c70a3f20 (pydantic/httpx2)

Patch available: pydantic/httpx2 v2.12.0 (contains commit 4fd0c70a3f20)

https://github.com/pydantic/httpx2/commit/4fd0c70a3f207c618b145934792f791bccfb39f8
github_pr Patch Available

Decode compressed response bodies incrementally

Patch available: pydantic/httpx2 v2.12.0 (PR #1126 merged 2026-08-18)

https://github.com/pydantic/httpx2/pull/1126
github Patch Available

Streaming response decompression does not bound peak memory (decompression amplification) · Advisory · pydantic/httpx2 · GitHub

https://github.com/pydantic/httpx2/security/advisories/GHSA-8xx6-hgc6-gc2m

Vendor Advisories for CVE-2026-84382(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 2 ecosystems)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
python-httpx22.4.0-1, 2.5.0-12.12.0-1—
PyPI(1)
PackageVulnerable rangeFixed inDependents
httpx20.0.0 ... 2.9.1 (15 versions)2.12.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 02:35 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 01:46 UTCEG score recompute
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-17 01:13 UTCEG score recompute
  6. 2026-09-16 14:09 UTCEPSS rescore
  7. 2026-09-16 12:58 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 12:08 UTCEG score recompute
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-15 03:12 UTCEPSS rescore
  12. 2026-09-13 23:22 UTCEG score recompute
  13. 2026-09-12 22:52 UTCEG score recompute
  14. 2026-09-11 22:18 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-11 10:00 UTCEG score recompute
  18. 2026-09-10 21:43 UTCEG score recompute
  19. 2026-09-08 23:11 UTCEG score recompute
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-07 17:42 UTCEG score recompute
  22. 2026-09-06 17:09 UTCEG score recompute
  23. 2026-09-06 13:48 UTCEPSS rescore
  24. 2026-09-05 16:36 UTCEG score recompute
  25. 2026-09-05 15:31 UTCEPSS rescore
Show 7 more
  1. 2026-09-04 16:04 UTCEG score recompute
  2. 2026-09-04 05:07 UTCEPSS rescore
  3. 2026-09-03 15:31 UTCEG score recompute
  4. 2026-09-03 14:35 UTCEG score recompute
  5. 2026-09-02 19:31 UTCEG score recompute
  6. 2026-09-02 18:28 UTCEG score recompute
  7. 2026-09-02 18:26 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-84382?
CVE-2026-84382 is a high vulnerability published on September 2, 2026. 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 iterbytes() or aiter_bytes() yields bounded pieces to the application. A 64 KiB compressed chunk can…
When was CVE-2026-84382 disclosed?
CVE-2026-84382 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84382 actively exploited?
CVE-2026-84382 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.3% of all scored CVEs.
What is the CVSS score of CVE-2026-84382?
CVE-2026-84382 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-84382?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84382, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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