CVE-2022-32206Public exploitNetwork attack vector

Service interruption via unbounded decompression chains

Published Jul 7, 2022 · Updated May 5, 2025

Uncontrolled resource allocation in curl 7.57.0 through 7.83.1 allows remote attackers to exhaust heap memory via HTTP responses. Curl_build_unencoding_stack accepted every Content-Encoding or Transfer-Encoding step and created another decoding writer without a chain limit. A malicious HTTP server can trigger the default Transfer-Encoding path after the client connects, causing extreme heap growth or an out-of-memory failure.

CVSS severity6.5
Medium
EPSS probability32.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource allocation in curl 7.57.0 through 7.83.1 allows remote attackers to exhaust heap memory via HTTP responses. Curl_build_unencoding_stack accepted every Content-Encoding or Transfer-Encoding step and created another decoding writer without a chain limit. A malicious HTTP server can trigger the default Transfer-Encoding path after the client connects, causing extreme heap growth or an out-of-memory failure.

The record

CVE
CVE-2022-32206
Published
Jul 7, 2022
Updated
May 5, 2025
Vendor
curl
Product
curl
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 2022CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Fixed in 7.84.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=Fixed in 7.84.0

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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