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TI-2026-41932 Aliases CVE-2026-58229

Unbounded HTTP/1 response-header and chunked-trailer accumulation in Mint causes memory-exhaustion DoS

Priority HIGH 69CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP server to exhaust memory on the client host and cause a denial of service. The Mint.HTTP1.decode_headers/5 and Mint.HTTP1.decode_trailer_headers/4 functions in lib/mint/http1.ex accumulate every parsed response header and chunked-trailer field into a per-request list that persists across incoming TCP segments as request.headers_buffer, and only clear it when the terminating blank line is received. The section has no cap on the number of headers or on total bytes, and the underlying :erlang.decode_packet(:httph_bin, binary, []) parser is invoked with an empty option list so its per-line and per-packet size limits also default to unlimited. A malicious HTTP server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can stream complete header lines (or, after a chunked body, complete trailer lines) indefinitely without ever emitting the terminating blank line. The connection state grows without bound until the BEAM node is killed by the operating system's out-of-memory handler, taking down the entire application that uses Mint as an HTTP client. This issue affects mint: from 0.1.0 before 1.9.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00502 43rd percentileScored 2026-11-07
Fix Fixed mint (elixir-mint): 1.9.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
elixir-mintmint0.1.0 to before 1.9.21.9.2Patch availableCNA
  • mint Vendorelixir-mint Affected 0.1.0 to before 1.9.2 Fixed in 1.9.2 Patch available CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*———
  • cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:* Versions — — ·—

Remediation

  • Fix · CNA mint (elixir-mint) Fixed in 1.9.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    elixir-mint mint 1.9.2

    2 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM

    Other records, highest priority first

    • TI-2026-42386 Zero-length HTTP/2 CONTINUATION frames bypass Mint's header-block byte-size cap and exhaust client memoryPriority MEDIUM 61
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-58229

References

Patch 1

Advisory 1

Other 2

  • TI-2026-41929 Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax CVSS 4.0HIGH 8.7
  • TI-2026-40963 mint buffers an entire chunked response chunk in memory in Mint.HTTP1.decode_body/5 CVSS 4.0HIGH 8.7
  • TI-2026-36665 HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation CVSS 4.0HIGH 8.2
  • TI-2026-36126 Unbounded conn.streams growth in Mint HTTP/2 client via unenforced PUSH_PROMISE concurrency CVSS 4.0HIGH 8.2
  • TI-2026-57046 Unbounded HTTP/1 status-line and chunk-extension buffering in Mint causes memory-exhaustion DoS CVSS 4.0HIGH 8.2
  • TI-2026-63369 Mint HTTP/1 client applies chunked framing when chunked is not the final transfer coding… CVSS 4.0MEDIUM 6.3
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences