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TI-2021-12382 Aliases CVE-2021-32714GHSA-5h46-h7hh-c6x9

Integer Overflow in Chunked Transfer-Encoding

Priority MEDIUM 42CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

hyper is an HTTP library for Rust. In versions prior to 0.14.10, hyper's HTTP server and client code had a flaw that could trigger an integer overflow when decoding chunk sizes that are too big. This allows possible data loss, or if combined with an upstream HTTP proxy that allows chunk sizes larger than hyper does, can result in "request smuggling" or "desync attacks." The vulnerability is patched in version 0.14.10. Two possible workarounds exist. One may reject requests manually that contain a `Transfer-Encoding` header or ensure any upstream proxy rejects `Transfer-Encoding` chunk sizes greater than what fits in 64-bit unsigned integers.

Why it matters now

EPSS 0.01155 67th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed hyper (hyperium): 0.14.10hyper (crates.io): 0.14.10

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
hyperiumhyperbefore 0.14.100.14.10Patch availableCNA
—hyper (crates.io)before 0.14.100.14.10Patch availableGHSA-5h46-h7hh-c6x9
  • hyper Vendorhyperium Affected before 0.14.10 Fixed in 0.14.10 Patch available CNA
  • hyper (crates.io) Vendor— Affected before 0.14.10 Fixed in 0.14.10 Patch available GHSA-5h46-h7hh-c6x9

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:hyper:hyper:*:*:*:*:*:rust:*:*before 0.14.10Vulnerablehyperium
  • cpe:2.3:a:hyper:hyper:*:*:*:*:*:rust:*:* Versions before 0.14.10 Vulnerable ·hyperium

Remediation

  • Fix · CNA hyper (hyperium) Fixed in 0.14.10
  • Fix · GHSA-5h46-h7hh-c6x9 hyper (crates.io) Fixed in 0.14.10 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-32714
  2. 2026-10-03 Alias added: GHSA-5h46-h7hh-c6x9

References

Exploit 1

Advisory 1

Other 2

  • TI-2023-11846 An issue was discovered in hyper v0.13.7. CVSS 3.1HIGH 7.5
  • TI-2022-13369 Hyperium Hyper before 0.14.19 does not allow for customization of the… CVSS 3.1HIGH 7.5
  • TI-2020-18306 An issue was discovered in the hyper crate before 0.12.34 for Rust. CVSS 3.1CRITICAL 9.8
  • TI-2021-04399 Multiple Transfer-Encoding headers misinterprets request payload CVSS 3.1HIGH 8.1
  • TI-2021-12383 Lenient Parsing of Content-Length Header When Prefixed with Plus Sign CVSS 3.1MEDIUM 5.3
  • TI-2017-13760 An issue was discovered in the hyper crate before 0.9.18 for Rust. CVSS 3.0MEDIUM 5.3
See all 7 →

Sources

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