CVE-2026-105659
HTTP/2 blocked-send deadlines reset on every WINDOW_UPDATE, letting a trickle pin stream processes indefinitely in Bandit
Published Oct 14, 2026 · corrected/updated Oct 15, 2026 · evidence confidence high
## Summary Uncontrolled Resource Consumption vulnerability in mtrudel bandit allows an unauthenticated remote attacker to pin HTTP/2 stream processes indefinitely via a trickle of small 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. re-queues a partially advanced send in with a fresh , so every on stream 0, and every frame, resets the clock. recurses on each stream and re-arms a fresh . 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 on stream 0 and shrinking the per-stream window with a small , so closing only the connection-level path leaves it exploitable. This issue affects bandit: from 1.4.0 before 1.13.0. ## Details **1. Connection-level block** ( ) A send that outruns the connection send window is queued in with an deadline computed in as now plus (15 seconds). drops any queued send whose deadline has passed whenever data arrives on the connection. runs on every on stream 0 and on every frame (including an empty one, through ). When the granted window is smaller than the queued remainder, the leftover is re-queued through , which recomputes from the current time instead of preserving the original deadline. Each partial advance therefore restarts the timer, and an empty frame restarts it without granting any window at all. **2. Stream-level block** ( ) runs in the stream process. When the stream send window is exhausted it enters a that waits for with (the struct default of 15 seconds, never overridden in ). On each stream it applies the delta and
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-105659 is a high public vulnerability record for this product. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether this product is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: bandit (1.4.0 → 1.13.0). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 8.7, EPSS 0.5%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-400. Sources contributing to this record: cve_org, epss, github, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 14, 2026 · NIST NVD
Detected
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
Oct 15, 2026 · NIST NVD
Updated
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
Oct 15, 2026 · GitHub Advisory Database
Fix available
bandit fixed in 1.13.0
Oct 15, 2026 · GitHub Advisory Database
Fix available
bandit fixed in 1.13.0
Oct 15, 2026 · GitHub Advisory Database
Updated
## Summary Uncontrolled Resource Consumption vulnerability in mtrudel bandit allows an unauthenticated remote attacker to pin HTTP/2 stream processes indefinitely via a trickle of small 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 par
Oct 15, 2026 · NIST NVD
Updated
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
Affected
- Hex bandit1.4.0 → 1.13.0
Sources
- CVE.orgVulnerability recordCVE-2026-105659
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-105659
30-day exploitation probability 0.5%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-69m6-wcv4-rwcf
GitHub Advisory Database record mirrored by OSV.
github.com - NIST NVDVulnerability recordCVE-2026-105659
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 t
nvd.nist.gov - OSV.devPackage advisoryEEF-CVE-2026-105659
HTTP/2 blocked-send deadlines reset on every WINDOW_UPDATE, letting a trickle pin stream processes indefinitely in Bandit
osv.dev