CVE-2026-105659

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Source
https://cve.org/CVERecord?id=CVE-2026-105659
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105659.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-105659
Aliases
Published
2026-10-14T16:54:46Z
Modified
2026-10-15T02:47:18Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
HTTP/2 blocked-send deadlines reset on every WINDOW_UPDATE, letting a trickle pin stream processes indefinitely in Bandit
Details

Uncontrolled Resource Consumption vulnerability in mtrudel bandit allows an unauthenticated remote attacker to pin HTTP/2 stream processes indefinitely via a trickle of small WINDOW_UPDATE frames. A stream whose response outruns the connection or stream send window blocks until the peer grants more window, and each block carries a 15 second deadline. Both deadlines restart whenever the peer makes partial progress. Bandit.HTTP2.Connection.finish_data/5 re-queues a partially advanced send in pending_sends with a fresh expires_at, so every WINDOW_UPDATE on stream 0, and every SETTINGS frame, resets the clock. Bandit.HTTP2.Stream.send_data/3 recurses on each stream WINDOW_UPDATE and re-arms a fresh after read_timeout. A peer that grants a few bytes every few seconds keeps the blocked stream process, its Plug state and any resource it holds mid-response alive for as long as it keeps dripping, and repeats this across streams and connections to exhaust server processes and memory.

The two paths are independent. The stream-level block is reached on its own by widening the connection window with a large WINDOW_UPDATE on stream 0 and shrinking the per-stream window with a small SETTINGS_INITIAL_WINDOW_SIZE, so closing only the connection-level path leaves it exploitable.

This issue affects bandit: from 1.4.0 onward.

Database specific 
{
    "cna_assigner":  "EEF",
    "cwe_ids":  [
        "CWE-400"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105659.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "1.4.0"
                },
                {
                    "fixed":  "*"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/mtrudel/bandit

Affected ranges

Type
GIT
Repo
https://github.com/mtrudel/bandit
Events
Introduced
fff06efe3be962b484bd4d3eb339372fda5a231f
Fixed
d88b21953c65061f21136ea76a89a4f95a2ac7a1

Affected versions

1.*
1.10.0
1.10.1
1.10.2
1.10.3
1.10.4
1.11.0
1.11.1
1.12.0
1.12.1
1.12.3
1.12.4
1.12.5
1.4.0
1.4.1
1.4.2
1.5.0
1.5.1
1.5.2
1.5.3
1.5.4
1.5.5
1.5.6
1.5.7
1.6.0
1.6.1
1.6.10
1.6.11
1.6.2
1.6.3
1.6.4
1.6.5
1.6.6
1.6.7
1.6.8
1.6.9
1.7.0
1.8.0
1.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105659.json"