Mint HTTP/2 client buffers oversized frames up to 16 MiB before enforcing max_frame_size
Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint mint allows a malicious HTTP/2 server to make the client hold up to about 16 MiB per connection in frames it should reject, consuming client memory. Mint.HTTP2.Frame.decode_next/2 in lib/mint/http2/frame.ex compares a frame with the client's max_frame_size (16,384 bytes by default) only once the whole declared payload has arrived. Until then it returns :more, and Mint.HTTP2 keeps every received byte in the connection buffer. A server can declare a frame length of up to 16,777,215 bytes and withhold the last byte, keeping roughly 1,024 times the advertised limit buffered for as long as the connection stays open. The server has to send every byte the client buffers, so there is no amplification, and the buffer stops at the 24-bit frame length limit. This issue affects mint: from 0.1.0 before 1.10.2.
CVE-2026-92103
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-92103
mint
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
mint
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"cpes": [
"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
],
"repo": "https://github.com/elixir-mint/mint",
"vendor": "elixir-mint",
"modules": [
"'Elixir.Mint.HTTP2.Frame'",
"'Elixir.Mint.HTTP2'"
],
"product": "mint",
"versions": [
{
"status": "affected",
"version": "0.1.0",
"lessThan": "1.10.2",
"versionType": "semver"
}
],
"packageURL": "pkg:hex/mint",
"packageName": "mint",
"programFiles": [
"lib/mint/http2/frame.ex",
"lib/mint/http2.ex"
],
"collectionURL": "https://repo.hex.pm",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "'Elixir.Mint.HTTP2.Frame':decode_next/2"
},
{
"name": "'Elixir.Mint.HTTP2':stream/2"
},
{
"name": "'Elixir.Mint.HTTP2':recv/3"
},
{
"name": "'Elixir.Mint.HTTP2':handle_new_data/3"
}
]
},
{
"cpes": [
"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
],
"repo": "https://github.com/elixir-mint/mint",
"vendor": "elixir-mint",
"modules": [
"'Elixir.Mint.HTTP2.Frame'",
"'Elixir.Mint.HTTP2'"
],
"product": "mint",
"versions": [
{
"status": "affected",
"changes": [
{
"at": "20252ca85065f4d1092aed9ee4ed21841a507dfe",
"status": "unaffected"
},
{
"at": "44d7ce4755d0444ee415cbcca7ce4942382da4dd",
"status": "unaffected"
}
],
"version": "596ca4304504be68939c4929e0831557097962b8",
"lessThan": "*",
"versionType": "git"
}
],
"packageURL": "pkg:github/elixir-mint/mint",
"packageName": "elixir-mint/mint",
"programFiles": [
"lib/mint/http2/frame.ex",
"lib/mint/http2.ex"
],
"collectionURL": "https://github.com",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "'Elixir.Mint.HTTP2.Frame':decode_next/2"
},
{
"name": "'Elixir.Mint.HTTP2':stream/2"
},
{
"name": "'Elixir.Mint.HTTP2':recv/3"
},
{
"name": "'Elixir.Mint.HTTP2':handle_new_data/3"
}
]
}
]- Related CVEs
- CVE-2026-92103
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #4466 · Revision 1
- Added to Heist Feed
- Publisher date