HTTP/2 inbound flow control is not enforced, letting a client queue unbounded DATA in stream processes in Bandit
Impact
Bandit HTTP/2 implementation has an Allocation of Resources Without Limits or Throttling vulnerability, allowing an unauthenticated remote attacker to exhaust server memory. This affects bandit versions from 0.3.1 before 1.14.0. The attacker can send DATA frames past the advertised receive window, causing the stream process to block and queue frames until the server runs out of memory.
Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.What to do
From 0.7.0, disable HTTP/2 with http_2_options: [enabled: false], which removes the vulnerable path.
Affected packages
Affected products
Vendor version evidence. Product records are separate from automatic dependency matching.
mtrudel · EEF
bandit
1 range
mtrudel · EEF
bandit
Package identity
pkg:hex/banditExplore bandit →Identity supplied by EEF. Version matching requires compatible range evidence.
Compare with this publisher’s ranges. This does not inspect your installation.
affected
0.3.1 → before 1.14.0
semver versions
Other versions: unaffected
Product identifiers (CPE)
cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*mtrudel · EEF
bandit
1 range
mtrudel · EEF
bandit
Package identity
pkg:github/mtrudel/banditIdentity supplied by EEF. Version matching requires compatible range evidence.
Compare with this publisher’s ranges. This does not inspect your installation.
affected
c8dc1e97050cf359f61ed6cdd110f3cdaf1d6f5f → before 220b9dfd27f9a21305be2afc75cbe585ddc24e7a
git versions
Other versions: unaffected
Product identifiers (CPE)
cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*Original source description
Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/2 implementation of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory via DATA frames sent past the advertised receive window. The attacker requests a response larger than the 65,535-byte initial window and withholds WINDOW_UPDATE, so the stream process blocks while sending and stops reading, then floods small DATA frames on that stream. Every frame is queued in the stream's mailbox until the BEAM node runs out of memory.
Bandit.HTTP2.Connection.handle_frame/3 in lib/bandit/http2/connection.ex forwards each DATA frame to the stream process without consulting the receive window, and Bandit.HTTP2.FlowControl.compute_recv_window/2 replenishes the window as data arrives rather than as it is consumed, and never answers a violation with FLOW_CONTROL_ERROR.
This issue affects bandit: from 0.3.1 before 1.14.0.
Inside the record
Evidence available
Describes the evidence in this view, not whether the product is safe.
Original records
CVE-2026-108525View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.
cve.new JSON →Underlying weaknesses
The source’s classification of what caused the vulnerability.
Environment requirements
These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.
EEF · platform conditions
All conditions must hold
Any condition may hold
Vulnerable product
cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*From (inclusive): 0.3.1
Before: 1.14.0
Original applicability statements
[
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.14.0",
"versionStartIncluding": "0.3.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
]Contributing organizations · 2
Assigning organization
Additional data publisher
What changed
Follow changesLarge field values are marked as truncated previews. Original source snapshots remain retained.