CVE-2023-26147: All versions of the package ithewei/libhv are vulnerable to HTTP Response Splitting when untrusted user input

This week

MEDIUM 5.3REMOTEMITIGATE

CVE-2023-26147 is a medium-severity flaw (CVSS 5.3) affecting libhv. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

All versions of the package ithewei/libhv are vulnerable to HTTP Response Splitting when untrusted user input is used to build headers values. An attacker can add the \r\n (carriage return line feeds) characters to end the HTTP response headers and inject malicious content, like for example additional headers or new response body, leading to a potential XSS vulnerability.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-113, CWE-79
Published	2023-09-29
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: ithewei

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-09-29 05:15 UTCPublished CVE record published
2026-06-17 05:42 UTCUpdated Record last modified

ithewei libhv MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libhv || rpm -q libhv || libhv --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-26147?

libhv: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-26147 being exploited?

CVE-2023-26147 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-26147 affect?

CVE-2023-26147 affects libhv. Severity is medium (CVSS 5.3). All versions of the package ithewei/libhv are vulnerable to HTTP Response Splitting when untrusted user input is used to build headers values. An attacker can add the \r\n (carriage return line feeds) characters to end the HTTP response hea

How urgent is CVE-2023-26147?

Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-26148 MEDIUM 5.4 MITIGATE All versions of the package ithewei/libhv are vulnerable to CRLF Injection when untrusted user input is used t
CVE-2023-26146 MEDIUM 6.1 MITIGATE All versions of the package ithewei/libhv are vulnerable to Cross-site Scripting (XSS) such that when a file w

References

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