Skip to main content
VulnerabilityPublished

CVE-2026-108529: mtrudel bandit · Inefficient Algorithmic Complexity

Affects mtrudel banditSource CVE Database V5

0

Not known to be exploited · CVSS 8.7 High : upgrade to 1.14.0 soon.

Data as of 26 Oct 2026, 14:01 UTC

CVSS 4.0 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.14.0, 220b9dfd27f9a21305be2afc75cbe585ddc24e7a
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade bandit to 1.14.0; bandit to 220b9dfd27f9a21305be2afc75cbe585ddc24e7a.

Affected software

ProductAffectedFixed in
mtrudelbanditAffected
  • >=0.3.4 <1.14.0
Fixed in
  • 1.14.0
banditmtrudel/banditAffected
  • ≥ 6feadb31189d18b7dcda6c663112cd3bbaf63a46, < 220b9dfd27f9a21305be2afc75cbe585ddc24e7a
Fixed in
  • 220b9dfd27f9a21305be2afc75cbe585ddc24e7a
Hexbanditpkg:hex/banditOther threatsAffected
  • >=0.3.4 <1.14.0
Fixed in
  • 1.14.0

CPE configurations (1)

  • cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

Inefficient Algorithmic Complexity vulnerability in the HTTP/2 implementation of mtrudel bandit allows an unauthenticated remote attacker to exhaust server CPU via small SETTINGS or connection-level WINDOW_UPDATE frames. The attacker opens thousands of streams whose responses block on the connection send window, then sends cheap frames that each make the server walk the whole queue of blocked sends. In the reporter's run, with 3,000 blocked streams a single 9-byte SETTINGS frame took 133 ms to process. do_pending_sends/2 in lib/bandit/http2/connection.ex retries every queued send and, before each retry, removes that entry from the queue with List.delete/2, so one frame costs O(n²) list operations for n blocked streams. max_concurrent_streams defaults to :infinity, so the attacker chooses n. This issue affects bandit: from 0.3.4 before 1.14.0.

References

Community reviews

Loading reviews…