CVE-2026-75922
Published Aug 23, 2026
Last updated 13 hours ago
AI description
CVE-2026-75922 identifies a CRLF injection vulnerability found in LNATION Reverse::Proxy, affecting versions up to and including 0.03. This flaw allows for remote exploitation without requiring any form of authentication. The vulnerability arises because the method, path, and headers are selected by the client but are attributed to the proxy. This characteristic could enable an attacker to access upstream paths that are not typically exposed by the proxy's defined routing rules.
- Description
- Reverse::Proxy versions before 0.04 for Perl allow HTTP request smuggling via a percent-decoded PATH_INFO written unencoded to the upstream request line. PSGI hands PATH_INFO to an application percent-decoded, so a %XX sequence in the client URL has become a raw byte by the time the proxy sees it. The proxy appends that byte string to the upstream base URL, and for an Upgrade tunnel writes it into a request line it serializes itself, re-encoding nothing in either path. The HTTP client that sends the resulting URL does not validate the target either. A path containing %0d%0a therefore arrives at the upstream as a CRLF that ends the request line, and a decoded space, '?' or '#' truncates it the same way. Everything the client writes after the CRLF is read by the upstream as a second request. On the buffered path it arrives on a keep-alive connection the proxy pools and reuses for other clients. Its method, path and headers are all chosen by the client, and the upstream attributes it to the proxy, so it reaches upstream paths that the proxy's own routing does not expose.
- Source
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
- NVD status
- Received
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
- CWE-93
Hype score is a measure of social media activity compared against trending CVEs from the past 12 months. Max score 100.
- Hype score
3
CVE-2026-75922 HTTP Request Smuggling in Reverse::Proxy Before 0.04 via PATH_INFO https://t.co/fNUIoNoFph
@VulmonFeeds
23 Aug 2026
51 Impressions
0 Retweets
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1 Bookmark
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🚨*CVE* CVE-2026-75922 Reverse::Proxy versions before 0.04 for Perl allow HTTP request smuggling via a percent-decoded PATH_INFO written unencoded to the upstream request line. PSGI hands … https://t.co/ryaoExeRym ----- Traducción: CVE-2026-75922 Rev… https://t.co/utmtNg
@infoflowcloud
23 Aug 2026
16 Impressions
0 Retweets
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CVE-2026-75922 Reverse::Proxy versions before 0.04 for Perl allow HTTP request smuggling via a percent-decoded PATH_INFO written unencoded to the upstream request line. PSGI hands … https://t.co/YSTxiv1cnP
@CVEnew
23 Aug 2026
1096 Impressions
0 Retweets
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