CVE-2026-66753

LOW 3.7

tiny-http 0.12.0 HTTP Response Splitting via Header Injection

CVSS Score

3.7

EPSS Score

0.0%

EPSS Percentile

0th

tiny-http through 0.12.0 contains an HTTP header injection vulnerability that allows attackers to inject carriage return (0x0D) and line feed (0x0A) bytes into HTTP header values on both request and response sides due to insufficient validation in header parsing and serialization. Attackers can exploit this injection primitive to perform response splitting, cache poisoning, session fixation via Set-Cookie injection, security header override, and request smuggling against line-feed-tolerant backends.

CWE	CWE-113
Vendor	tiny-http
Product	tiny-http
Published	Jul 28, 2026
Last Updated	Jul 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

tiny-http / tiny-http

0 ≤ 0.12.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/theopaid/HTTP-Header-Injection-via-Unvalidated-CR-and-LF-in-Header-Values-tiny_http-/tree/master vulncheck.com: https://www.vulncheck.com/advisories/tiny-http-http-response-splitting-via-header-injection

Credits

Theodosis Paidakis