HTTP Request Smuggling Affecting lighttpd package, versions [1.4.80, 1.4.81)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published4 Nov 2025
- disclosed3 Nov 2025
- creditUnknown
Introduced: 3 Nov 2025
NewCVE-2025-12642 (opens in a new tab)How to fix?
Upgrade lighttpd to version 1.4.81 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling via the http request parsing process. An attacker can bypass access control rules, inject unsafe input into backend logic that trusts request headers, or interfere with backend processing by crafting specially constructed HTTP requests that exploit improper merging of trailer fields into headers.