CVSS 4.0
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се по мрежата, без особени условия, само при определена конфигурация или състояние на системата, без вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
Improper Encoding or Escaping of Output vulnerability in ninenines cowlib allows Link header directive smuggling via unescaped special characters in cow_link:link/1. cow_link:do_link/1 in cowlib interpolates the target URI, rel value, and attribute keys directly into the serialized Link: header value without escaping or token-grammar validation. A > byte in target prematurely closes the URI slot, allowing an attacker to append additional link entries with attacker-chosen rel directives. A " or \ in rel escapes the quoted string and opens new parameters. Any byte — including whitespace, =, and " — in an attribute key is emitted verbatim. Because browsers act on Link: directives such as rel="preconnect", rel="preload", and rel="prerender", an attacker who can influence these fields in an application that round-trips parsed Link headers through cow_link:link/1 can force victim browsers to make out-of-band connections to attacker-controlled origins. This issue affects cowlib: from 2.9.0 before 2.20.0.
Засегнати продукти
- ninenines cowlib: 2.9.0 преди 2.20.0
- ninenines cowlib: 485d58dfa91b91d98135dc95e5615f421715dae5 преди 89da27ee4c241f5d649ba7d9b7f2188918af6cea
Вид слабост
История
- 18 август 2026 Публикувано
Други уязвимости в ninenines cowlib
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-43971
- https://nvd.nist.gov/vuln/detail/CVE-2026-43971
- https://cna.erlef.org/cves/CVE-2026-43971.html
- https://osv.dev/vulnerability/EEF-CVE-2026-43971
- https://github.com/ninenines/cowlib/commit/485d58dfa91b91d98135dc95e5615f421715dae5
- https://github.com/ninenines/cowlib/commit/89da27ee4c241f5d649ba7d9b7f2188918af6cea