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CVE-2026-49753— HTTP response smuggling in Mint HTTP/1 client via lenient Content-Length parsing

Quick assessment

Affected

elixir-mint mint

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mint是Elixir Mint开源的一个功能性的底层HTTP客户端库。 Mint 0.1.0版本至1.9.0之前版本存在安全漏洞，该漏洞源于HTTP请求解释不一致，可能导致攻击者控制的HTTP/1服务器在共享连接上使响应帧不同步。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.30% · P23 Updated Jun 03, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

Vendor	Product	Version Range	Status
elixir-mint	mint	`0.1.0< 1.9.0`	affected
		`65e0e86d799a6d3b08e4372fccdd9747535e0dd6< 47e48027480228e4e32a0b4df39db497b4804921`	affected

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I. Basic Information for CVE-2026-49753

Vulnerability Information

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Vulnerability Title

HTTP response smuggling in Mint HTTP/1 client via lenient Content-Length parsing

Source: CVE Program / CVE List V5

Vulnerability Description

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in elixir-mint Mint allows attacker-controlled HTTP/1 servers to desynchronise response framing on shared connections. Mint's HTTP/1 Content-Length parser, Mint.HTTP1.Parse.content_length_header/1 in lib/mint/http1/parse.ex, parses the header value with Integer.parse/1, which accepts an optional + or - sign prefix. The length >= 0 guard rejects negatives, but inputs such as +0 or +123 are returned as valid lengths. RFC 7230 specifies Content-Length = 1*DIGIT, with no sign character permitted. A fronting proxy or load balancer that strictly enforces the grammar will reject or reframe a header like Content-Length: +0, while Mint silently treats it as zero. When Mint reuses the socket (keep-alive, pipelining, or any pooled connection shared across requesters), the parser disagreement is a response-smuggling primitive: the proxy delimits the body one way, Mint another, and bytes from one response get attributed to the next. Where the same Mint connection is shared across trust boundaries, an attacker-controlled upstream can leak bytes into a different consumer's response stream. This issue affects mint: from 0.1.0 before 1.9.0.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

HTTP请求的解释不一致性(HTTP请求私运)

Source: CVE Program / CVE List V5

Vulnerability Title

Mint 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
elixir-mint	mint	0.1.0 ~ 1.9.0	`cpe:2.3:a:elixir-mint:mint::::::::`
elixir-mint	mint	65e0e86d799a6d3b08e4372fccdd9747535e0dd6 ~ 47e48027480228e4e32a0b4df39db497b4804921	`cpe:2.3:a:elixir-mint:mint::::::::`

II. Public POCs for CVE-2026-49753

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-49753

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Patches & Fixes for CVE-2026-49753 (1)

🔗 Merge commit from fork · elixir-mint/mint@47e4802 · GitHub Read full article patch

Vendor Advisories for CVE-2026-49753 (3)

https://www.cve.org/CVERecord?id=CVE-2026-49753

Same Patch Batch · elixir-mint · 2026-06-02 · 4 CVEs total

CVE-2026-48862		Unbounded conn.streams growth in Mint HTTP/2 client via unenforced PUSH_PROMISE concurrenc
CVE-2026-48861		CRLF injection in HTTP/1 request line via unvalidated method in Mint
CVE-2026-49754		HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation

IV. Related Vulnerabilities

Same product: mint

Same vendor: elixir-mint

Same weakness: CWE-444