CVE-2023-26147Public exploitNetwork attack vector

Response content injection via unsanitized header values

Published Sep 29, 2023 · Updated Sep 23, 2024

HTTP response splitting in ithewei libhv 1.3.2 and earlier allows remote attackers to inject headers and response bodies. HttpResponse header serialization emits CR and LF characters from untrusted header values without neutralizing message delimiters. Exploitation requires a consuming application to place attacker-controlled data in a response header; the injected body can execute script when a browser renders it.

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 response splitting in ithewei libhv 1.3.2 and earlier allows remote attackers to inject headers and response bodies. HttpResponse header serialization emits CR and LF characters from untrusted header values without neutralizing message delimiters. Exploitation requires a consuming application to place attacker-controlled data in a response header; the injected body can execute script when a browser renders it.

The record

CVE
CVE-2023-26147
Published
Sep 29, 2023
Updated
Sep 23, 2024
Vendor
ithewei
Product
libhv
Classifications
CWE-79, CWE-113, CAPEC-34, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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?

ithewei · libhvversion=0 <*

Published CVSS scores

5.3SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.1NIST NVDCVSS: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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CAPEC-34HTTP Response Splitting
T1189Drive-by Compromise

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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