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VulnerabilityPublished

CVE-2026-109584: mtrudel bandit · Data Amplification

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, 14:18 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
  • >=0.3.3 <1.14.0
Fixed in
  • 1.14.0
banditmtrudel/banditAffected
  • ≥ 44bf969cd59851622fb6ee4d16227fbc39a77fb4, < 220b9dfd27f9a21305be2afc75cbe585ddc24e7a
Fixed in
  • 220b9dfd27f9a21305be2afc75cbe585ddc24e7a
Hexbanditpkg:hex/banditOther threatsAffected
  • >=0.3.3 <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.

AI-suggested

Upgrade to mtrudel bandit version 1.14.0 or later, where this vulnerability is fixed. The fix addresses the improper memory allocation by enforcing appropriate limits on header list size and handling of compressed headers. No other mitigation is indicated by the vendor advisory.

Description

CVE-2026-109584 is a high-severity vulnerability in the HTTP/2 implementation of mtrudel bandit that allows unauthenticated remote attackers to exhaust server memory. The flaw arises from improper handling of highly compressed HPACK HEADERS blocks, where a small compressed block can cause excessive memory allocation by repeatedly referencing a large cookie value. This affects bandit versions from 0.3.3 up to but not including 1.14.0. The issue is fixed in version 1.14.0.

References

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