EUVD-2026-71219Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network vector but AC:H because attacker must control the server the client connects to; availability impact is Low per bounded CPU exhaustion.
Primary rating from Vendor (EEF).
CVSS VectorVendor: EEF
Lifecycle Timeline
2DescriptionCVE.org
Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service.
parse_hex_prefix/2 in lib/mint/http1/parse.ex folds each hex digit of a chunked response's chunk-size field into an arbitrary-precision accumulator with acc * 16 + digit and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over N digits costs O(N squared). handle_data/2 prepends conn.buffer and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.
This issue affects mint: from 1.9.3 before 1.10.0.
AnalysisAI
CPU exhaustion via crafted chunked HTTP responses affects the Elixir Mint HTTP client library (versions 1.9.3 through before 1.10.0). The chunk-size hex parser in lib/mint/http1/parse.ex accumulates digits into an arbitrary-precision integer using acc * 16 + digit with no upper bound on digit count, producing O(N²) cost per parse pass; compounded by a re-parse-from-start design on each socket message, a server that trickles digits forces the client to pay this cost repeatedly. …
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Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim application must initiate an outgoing HTTP/1.1 connection to a server controlled or influenced by the attacker. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.3 reflects a moderate, client-side DoS with AT:P (attack requirements present), meaning exploitation is contingent on the victim application connecting to an attacker-controlled server - a non-trivial precondition that reduces real-world risk relative to a straightforward inbound server vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Elixir Mint to version 1.10.0 or later, which includes the fix from commit bd2a4e7513594997c140cfef9fe0e968712fb588 (https://github.com/elixir-mint/mint/commit/bd2a4e7513594997c140cfef9fe0e968712fb588). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-407 – Inefficient Algorithmic Complexity
View allSame technique Denial Of Service
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External POC / Exploit Code
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