What is CVE-2026-43971?
CVE-2026-43971 is an improper output encoding vulnerability in ninenines cowlib, where cow_link:link/1 fails to escape special characters in the Link header. This flaw allows Link header directive smuggling by injecting unescaped characters into the serialized header value. Developers should update cowlib to the patched version and ensure proper escaping of header values.
Azərbaycanca: CVE-2026-43971, ninenines cowlib kitabxanasında Link header-in formalaşdırılması zamanı xüsusi simvolların düzgün qaçırılmaması (escaping) səbəbindən baş verən zəiflikdir. Bu, cow_link:link/1 funksiyası vasitəsilə Link header direktivlərinin qaçaqmalçılığına (directive smuggling) yol aça bilər. Tərtibatçılar cowlib-i ən son versiyaya yeniləməli və Link header dəyərlərini düzgün kodlaşdırmalıdırlar.
Related CVEs
link basis: same weakness class CWE-79
FAQ2
In which library was CVE-2026-43971 discovered and what is its root cause?
CVE-2026-43971 was discovered in the ninenines cowlib library. The root cause is the failure to properly escape special characters during the serialization of Link headers.
What can an attacker achieve by exploiting this vulnerability?
An attacker can perform Link header directive smuggling via the cow_link:link/1 function by injecting unescaped characters into the serialized header value.
See also6
This explainer is AI-written from source data — skopnix's own reporting on this CVE; CVSS scores, vendors and versions are never invented. See NVD for the official record.