CVE-2026-110499: mtrudel bandit · Unthrottled Resource Allocation
Affects mtrudel banditSource CVE Database V5
Not known to be exploited · CVSS 8.7 High : upgrade to 1.14.0 soon.
Data as of 26 Oct 2026, 14:01 UTC
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| mtrudelbandit | Affected
| Fixed in
|
| banditmtrudel/bandit | Affected
| Fixed in
|
Hexbanditpkg:hex/banditOther threats | Affected
| Fixed in
|
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
Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/2 implementation of mtrudel bandit allows an unauthenticated remote attacker to grow per-connection memory and CPU cost without bound via a large SETTINGS_HEADER_TABLE_SIZE. Bandit resizes its HPACK encoder table to whatever size the client advertises, up to 2^32-1 bytes, and indexes response headers into it. Because responses carry distinct values such as date or content-length, nothing is evicted and the table grows with every response for the life of the connection, while each lookup scans it linearly. The SETTINGS handling in Bandit.HTTP2.Connection (lib/bandit/http2/connection.ex) passes remote_settings.header_table_size to HPAX.resize/2 with no server-side cap, and encode_headers encodes every response header as :store. Serving N responses on one connection therefore costs O(N²) CPU in the connection process. This issue affects bandit: from 0.3.6 before 1.14.0.
References
- github.com/mtrudel/bandit/security/advisories/GHSA-47x4-3fxf-82fr (opens in a new tab)
- cna.erlef.org/cves/CVE-2026-110499.html (opens in a new tab)
- osv.dev/vulnerability/EEF-CVE-2026-110499 (opens in a new tab)
- github.com/mtrudel/bandit/commit/0e68313fab9d204257ebad5c447e4cd9cea8e0ea (opens in a new tab)
- github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a (opens in a new tab)