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CVE-2026-56810— mint buffers an entire chunked response chunk in memory in Mint.HTTP1.decode_body/5

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.

elixir-mint mint是elixir-mint的HTTP客户端库。 Elixir Mint Mint 0.5.0版本至1.9.1之前版本存在资源管理错误漏洞，该漏洞源于资源未限速（Mint.HTTP1模块）问题，当解码分块传输编码响应时，未对块大小设限，导致恶意或受感染的服务器可造成拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.52% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
elixir-mint mint 0.5.0< 1.9.1 affected
c575d819d39ebf7e9b77ec24584a5ffbb11c844e< 193ce714907d16e8adc4ab3c40e4f0c2f045b2a6 affected
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I. Basic Information for CVE-2026-56810

Vulnerability Information
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Vulnerability Title
mint buffers an entire chunked response chunk in memory in Mint.HTTP1.decode_body/5
Source: CVE Program / CVE List V5
Vulnerability Description
Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint mint (Mint.HTTP1 module) allows a denial of service via an oversized chunked transfer-encoded response. This vulnerability is associated with program files lib/mint/http1.ex and program routines 'Elixir.Mint.HTTP1':decode_body/5, 'Elixir.Mint.HTTP1':add_body_to_buffer/2. When Mint decodes a chunked HTTP response body, it accumulates each partial fragment of the current chunk in the connection's data_buffer (an unbounded iolist) via add_body_to_buffer/2 and does not emit the data to the caller until the full declared chunk length has been received. The chunk size is taken directly from the server and parsed with no upper bound, so a malicious or compromised server can announce one enormous chunk (for example a size line of 7FFFFFFF, about 2 GiB) and then send the body bytes slowly without ever completing the chunk. The client buffers every received byte while it waits for a completion that never arrives, and because no data responses are produced until the chunk finishes, a caller that otherwise streams large content-length bodies safely gains no protection. An unauthenticated remote server (reachable whenever a client follows redirects, fetches user-supplied URLs, or processes webhooks) can drive the client's memory arbitrarily high and trigger an out-of-memory condition. This issue affects mint: from 0.5.0 before 1.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Elixir Mint Mint 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
elixir-mint mint是elixir-mint的HTTP客户端库。 Elixir Mint Mint 0.5.0版本至1.9.1之前版本存在资源管理错误漏洞，该漏洞源于资源未限速（Mint.HTTP1模块）问题，当解码分块传输编码响应时，未对块大小设限，导致恶意或受感染的服务器可造成拒绝服务。
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 0.5.0 ~ 1.9.1 cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*
elixir-mint mint c575d819d39ebf7e9b77ec24584a5ffbb11c844e ~ 193ce714907d16e8adc4ab3c40e4f0c2f045b2a6 cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-56810

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III. Intelligence Information for CVE-2026-56810

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Patches & Fixes for CVE-2026-56810 (1)

Vendor Advisories for CVE-2026-56810 (3)

IV. Related Vulnerabilities

Same product: mint
Same vendor: elixir-mint
Same weakness: CWE-770