CVE-2026-7790
HighSummary
Uncontrolled Resource Consumption vulnerability in the cow_http_te module of the ninenines cowlib allows for excessive resource allocation. An attacker can exploit this vulnerability by sending an HTTP/1.1 request with Transfer-Encoding: chunked and a very long hex string in the chunk-size field, leading to CPU exhaustion and memory amplification.
Risk Assessment
The organization may experience denial of service attacks that could result in significant downtime for services and increased consumption of system resources.
Recommendation
It is recommended to update the cowlib library to version 2.16.1 or later to mitigate this vulnerability and to monitor network traffic for potential attack attempts.
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Original NVD description (English source)
Uncontrolled Resource Consumption vulnerability in ninenines cowlib (cow_http_te module) allows Excessive Allocation. The chunked transfer-encoding parser in cow_http_te accepts an unbounded number of hex digits in the chunk-size field. Each digit causes a bignum multiplication (Len * 16 + digit), so parsing N hex digits requires O(N²) CPU work and O(N) memory. Additionally, when input is drip-fed, the parser discards the accumulated length on each partial read and restarts from zero on resumption, raising the cost to O(N³). An unauthenticated remote attacker can exploit this by sending an HTTP/1.1 request with Transfer-Encoding: chunked and a very long chunk-size hex string to cause denial of service through CPU exhaustion and memory amplification. This vulnerability is associated with program file src/cow_http_te.erl and program routines cow_http_te:stream_chunked/2, cow_http_te:chunked_len/4. This issue affects cowlib: from 0.6.0 before 2.16.1.