CVE-2026-24489Public exploitNetwork attack vector

Request header injection via unsanitized header fields

Published Jan 27, 2026 · Updated Jan 27, 2026

HTTP header injection in Happy Hacking Space Gakido before 0.1.1 allows remote attackers to inject arbitrary request headers. The canonicalize_headers() function in gakido/headers.py merges user-supplied header names and values without removing CR, LF, or null bytes. Reachability requires a consuming application to pass attacker-controlled fields into a request method; exploitation modifies the outbound request, while downstream cache or session effects depend on intermediary behavior.

CVSS severity5.3
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP header injection in Happy Hacking Space Gakido before 0.1.1 allows remote attackers to inject arbitrary request headers. The canonicalize_headers() function in gakido/headers.py merges user-supplied header names and values without removing CR, LF, or null bytes. Reachability requires a consuming application to pass attacker-controlled fields into a request method; exploitation modifies the outbound request, while downstream cache or session effects depend on intermediary behavior.

The record

CVE
CVE-2026-24489
Published
Jan 27, 2026
Updated
Jan 27, 2026
Vendor
Happy Hacking Space
Product
Gakido
Classifications
CWE-113, CWE-93
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 2026Record 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=< 0.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Happy Hacking Space · Gakidoversion=< 0.1.1

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')

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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