TI-2026-63369 Aliases CVE-2026-94194

Mint HTTP/1 client applies chunked framing when chunked is not the final transfer coding…

MEDIUM 61CWE-444Published 2026-09-28 · Updated 2026-09-30

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in elixir-mint mint allows a malicious HTTP/1 server to desynchronize an intermediary and the Mint client on a pooled connection, poisoning the responses to subsequent requests that share the connection. message_body/1 in lib/mint/http1.ex selects chunked framing when chunked is the first coding listed in a response's Transfer-Encoding fields. RFC 9112 section 6.3 applies chunked framing only when chunked is the final coding, and otherwise reads the body until the server closes the connection. For a response such as Transfer-Encoding: chunked, gzip, an intermediary that follows the RFC treats every byte up to the close as the body, while Mint ends the body at the zero-length chunk and parses the remaining bytes as the response to the next request on the connection. Mint also keeps the connection open after an HTTP/1.0 response, final or 1xx, that carries Transfer-Encoding and Connection: keep-alive. RFC 9112 section 6.1 requires treating the framing of such a message as faulty and closing the connection after it, so bytes after its chunked body are parsed as the response to the next request in the same way. This issue affects mint: from 0.1.0 before 1.10.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00416 36th percentileScored 2026-11-07

Fix Fixed mint (elixir-mint): 1.10.2

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

Vendor	Product	Affected versions	Fixed in	Status	Source
elixir-mint	mint	0.1.0 to before 1.10.2	1.10.2	Patch available	CNA

mint Vendorelixir-mint Affected 0.1.0 to before 1.10.2 Fixed in 1.10.2 Patch available CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:elixir-mint:mint::::::::	—	—	—

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

Remediation

Fix · CNA mint (elixir-mint) Fixed in 1.10.2

Fixed in the same release

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

Release · 2026-09-28
elixir-mint mint 1.10.2
3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-62214 Mint HTTP/2 client buffers oversized frames up to 16 MiB before enforcing max_frame_sizePriority MEDIUM 61
- TI-2026-61862 HPACK-indexed cookie fields in Mint HTTP/2 responses bypass max_header_list_size and exhaust client memoryPriority LOW 36
Show all 3 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-94194

References

Patch 2

Advisory 1

GitHub Advisory

Other 3

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-2026-41932 Unbounded HTTP/1 response-header and chunked-trailer accumulation in Mint causes memory-exhaustion DoS CVSS 4.0HIGH 8.2

See all 14 →

Sources

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