CVE-2021-46142Public exploit

Application crash via invalid empty-segment free

Published Jan 6, 2022 · Updated Aug 4, 2024

Use-after-free in uriparser before 0.9.6 allows local users to crash a consuming application by triggering URI normalization. When normalization of an empty URI segment encounters an allocation failure, uriPreventLeakage treats non-heap-backed text as owned and passes it to the configured free callback. Exploitation requires a consuming application to normalize a URI containing empty segments during an allocation failure, and user interaction is required.

CVSS severity5.5
Medium
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in uriparser before 0.9.6 allows local users to crash a consuming application by triggering URI normalization. When normalization of an empty URI segment encounters an allocation failure, uriPreventLeakage treats non-heap-backed text as owned and passes it to the configured free callback. Exploitation requires a consuming application to normalize a URI containing empty segments during an allocation failure, and user interaction is required.

The record

CVE
CVE-2021-46142
Published
Jan 6, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NVDCVSS:3.1/AV:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
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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