CVE-2024-36048Network attack vector

OAuth nonce prediction via time-seeded PRNG

Published May 18, 2024 · Updated Nov 4, 2025

Predictable nonce generation in Qt Network Authorization allows attackers to predict OAuth 1 nonces in affected Qt 5 and 6 releases. QAbstractOAuth seeds the OAuth 1 nonce PRNG only from the current time, so an attacker who estimates initialization time can reproduce its output. Exploitation requires control over the timing of the process’s first OAuth 1 flow; success reveals that flow’s nonce, while Qt has not published a more specific downstream consequence.

CVSS severity9.8
Critical
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Predictable nonce generation in Qt Network Authorization allows attackers to predict OAuth 1 nonces in affected Qt 5 and 6 releases. QAbstractOAuth seeds the OAuth 1 nonce PRNG only from the current time, so an attacker who estimates initialization time can reproduce its output. Exploitation requires control over the timing of the process’s first OAuth 1 flow; success reveals that flow’s nonce, while Qt has not published a more specific downstream consequence.

The record

CVE
CVE-2024-36048
Published
May 18, 2024
Updated
Nov 4, 2025
Vendor
The Qt Company
Product
Qt Network Authorization
Classifications
CWE-335
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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 <5.15.17
  2. Affected versionversion=6.3x <6.5.6
  3. Affected versionversion=6.3x <=6.5x
  4. Affected versionversion=6.6x <6.71
  5. Affected versionversion=6.6x <=6.7x
  6. Affected versionversion=6x <6.2.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Qt Company · Qt Network Authorizationversion=0 <5.15.17; version=6.3x <6.5.6; version=6.3x <=6.5x; version=6.6x <6.71; version=6.6x <=6.7x; version=6x <6.2.13

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-335Incorrect Usage of Seeds in Pseudo-Random Number Generator (PRNG)

Public exploit references

No public exploit references are available in this record.

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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