tiny-http 0.12.0 HTTP Response Splitting via Header Injection
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.3epss 0.2%
from disclosure to weapon0 days
Published on NVDJul 28
1st PoCJul 26
exploitation probability
0.2%top 88% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products
tiny-http · tiny-httppublic PoCs found — 2
githubgithub.com/theopaid/CVE-2026-66753-HTTP-Header-Injection-via-Unvalidated-CR-and-LF-in-Header-Values-tiny_http-★ 0cve_referencegithub.com/theopaid/HTTP-Header-Injection-via-Unvalidated-CR-and-LF-in-Header-Values-tiny_http-/tree/masterunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.