CVE-2023-26137: All versions of the package drogonframework/drogon are vulnerable to HTTP Response Splitting when untrusted us

This week

HIGH 7.2REMOTEMITIGATE

CVE-2023-26137 is a high-severity flaw (CVSS 7.2) affecting drogon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

All versions of the package drogonframework/drogon are vulnerable to HTTP Response Splitting when untrusted user input is used to build header values in the addHeader and addCookie functions. An attacker can add the \r\n (carriage return line feeds) characters to end the HTTP response headers and inject malicious content.

Why this priority

High severity
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	7.2 (High)
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-444
Published	2023-07-06
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: drogon

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

Am I affected?

Timeline

2023-07-06 05:15 UTCPublished CVE record published
2026-06-17 05:42 UTCUpdated Record last modified

drogon drogon 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 drogon || rpm -q drogon || drogon --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-2023-26137?

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

Is CVE-2023-26137 being exploited?

CVE-2023-26137 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-2023-26137 affect?

CVE-2023-26137 affects drogon. Severity is high (CVSS 7.2). All versions of the package drogonframework/drogon are vulnerable to HTTP Response Splitting when untrusted user input is used to build header values in the addHeader and addCookie functions. An attacker can add the \r\n (carriage return li

How urgent is CVE-2023-26137?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-26138 MEDIUM 5.4 MITIGATE All versions of the package drogonframework/drogon are vulnerable to CRLF Injection when untrusted user input
CVE-2022-3959 LOW 3.1 UPGRADE A vulnerability, which was classified as problematic, has been found in drogon up to 1.8.1

References

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