CVE-2022-32149Network attack vector

Denial of service via unbounded tag complexity

Published Oct 14, 2022 · Updated May 15, 2025

Algorithmic complexity denial of service in Go x/text before 0.3.8 allows remote attackers to consume CPU via Accept-Language headers. ParseAcceptLanguage passes arbitrarily complex BCP 47 tag lists into a quadratic-time parser without bounding their complexity or number of separators. Exposure requires an application to pass attacker-controlled Accept-Language values to the function; crafted values can tie up request processing without reading or altering data.

CVSS severity7.5
High
EPSS probability1.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Algorithmic complexity denial of service in Go x/text before 0.3.8 allows remote attackers to consume CPU via Accept-Language headers. ParseAcceptLanguage passes arbitrarily complex BCP 47 tag lists into a quadratic-time parser without bounding their complexity or number of separators. Exposure requires an application to pass attacker-controlled Accept-Language values to the function; crafted values can tie up request processing without reading or altering data.

The record

CVE
CVE-2022-32149
Published
Oct 14, 2022
Updated
May 15, 2025
Vendor
Go
Product
golang.org/x/text/language
Classifications
CWE-772, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2022CVE publishedPublication date reported by the CVE source.
  2. May 15, 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=0 <0.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go · golang.org/x/text/languageversion=0 <0.3.8

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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