CyberRota Analysis
AI-GeneratedThe hpax library in Elixir is vulnerable to an inefficient algorithmic complexity issue that allows unauthenticated attackers to trigger a denial-of-service condition through unbounded HPACK integer decoding. By sending specially crafted HTTP/2 header blocks, an attacker can exploit this vulnerability to consume excessive CPU and memory resources, leading to potential service outages. Organizations using hpax versions 0.1.1 to 1.0.4 should prioritize patching this vulnerability to mitigate the risk of denial-of-service attacks.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding. hpax decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. 'Elixir.HPAX.Types':decode_remaining_integer/3 accumulates the integer as int + (value <<< m), shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the 'Elixir.HPAX':decode/2 entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification. This issue affects hpax from 0.1.1 before 1.0.4.