CVE-2024-26455Public exploitNetwork attack vector

Service crash via freed Calyptia context write

Published Feb 26, 2024 · Updated Aug 28, 2024

Use-after-free in Fluent Bit 2.2.2 allows remote attackers to crash the service during Calyptia output initialization. The setup_cloud_output error path frees the ctx allocation, after which its caller assigns the returned output pointer through ctx->o. The Calyptia custom output must reach that error path; public materials do not identify the network input that causes the condition or report data access or modification.

CVSS severity7.5
High
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in Fluent Bit 2.2.2 allows remote attackers to crash the service during Calyptia output initialization. The setup_cloud_output error path frees the ctx allocation, after which its caller assigns the returned output pointer through ctx->o. The Calyptia custom output must reach that error path; public materials do not identify the network input that causes the condition or report data access or modification.

The record

CVE
CVE-2024-26455
Published
Feb 26, 2024
Updated
Aug 28, 2024
Vendor
Fluent Bit
Product
Fluent Bit
Classifications
CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fluent Bit · Fluent Bitversion=2.2.2

Published CVSS scores

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.

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 exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo