CVE-2023-26138: All versions of the package drogonframework/drogon are vulnerable to CRLF Injection when untrusted user input

Routine

MEDIUM 5.4MITIGATE

CVE-2023-26138 is a medium-severity flaw (CVSS 5.4) 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 CRLF Injection when untrusted user input is used to set request headers in the addHeader function. An attacker can add the \r\n (carriage return line feeds) characters and inject additional headers in the request sent.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-93, CWE-74
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-2023-26138?

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

Is CVE-2023-26138 being exploited?

CVE-2023-26138 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-2023-26138 affect?

CVE-2023-26138 affects drogon. Severity is medium (CVSS 5.4). All versions of the package drogonframework/drogon are vulnerable to CRLF Injection when untrusted user input is used to set request headers in the addHeader function. An attacker can add the \r\n (carriage return line feeds) characters and

How urgent is CVE-2023-26138?

Priority 33/100. Public exploit reference

Related CVEs

CVE-2023-26137 HIGH 7.2 MITIGATE All versions of the package drogonframework/drogon are vulnerable to HTTP Response Splitting when untrusted us
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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