CVE-2023-26142Public exploitNetwork attack vector

Response splitting via unsanitized header values

Published Sep 12, 2023 · Updated Sep 26, 2024

HTTP response splitting in Crow before 1.3.2 allows remote attackers to inject response headers and bodies through crafted header values. The set_header and add_header methods insert caller-supplied names and values without removing CR or LF delimiters. Reachability requires an application route to pass attacker-controlled data into these APIs; successful injection can alter headers or a response body.

CVSS severity6.5
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP response splitting in Crow before 1.3.2 allows remote attackers to inject response headers and bodies through crafted header values. The set_header and add_header methods insert caller-supplied names and values without removing CR or LF delimiters. Reachability requires an application route to pass attacker-controlled data into these APIs; successful injection can alter headers or a response body.

The record

CVE
CVE-2023-26142
Published
Sep 12, 2023
Updated
Sep 26, 2024
Vendor
CrowCpp
Product
Crow
Classifications
CWE-74, CWE-113, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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?

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

  1. Affected versionversion=0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CrowCpp · Crowversion=0 <*

Published CVSS scores

6.5SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.1National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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 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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
T1190Exploit Public-Facing Application

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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