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Back to active CVEs
High · CVSS 8.7CVE-2026-113436

Quadratic bignum parsing of Content-Length and Host port values in BanditCVE-2026-113436

Answer in brief

CVE-2026-113436 records a High severity (CVSS 8.7) vulnerability in Quadratic bignum parsing of Content-Length and Host port values in Bandit. The current sources do not mark it as known exploited. The current feed maps mtrudel/bandit (generic), mtrudel/mtrudel/bandit (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 26, 2026Updated Oct 26, 2026Source checked Oct 26, 2026First seen by HOL Oct 26, 2026Material review Oct 26, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps mtrudel/bandit (generic), mtrudel/mtrudel/bandit (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
mtrudel/banditgeneric>=1.0.0-pre.7 <1.14.01.14.0
mtrudel/mtrudel/banditgeneric>=e0c8c0c30af9b0f57d8aafac37ddd9294363a8be <220b9dfd27f9a21305be2afc75cbe585ddc24e7a220b9dfd27f9a21305be2afc75cbe585ddc24e7a

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for mtrudel/bandit, mtrudel/mtrudel/bandit.
  2. 2Review the reported fix. Update mtrudel/bandit to 1.14.0; mtrudel/mtrudel/bandit to 220b9dfd27f9a21305be2afc75cbe585ddc24e7a if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 26, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 26, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 26, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
Upstream source description

Inefficient Algorithmic Complexity vulnerability in the header integer parser of mtrudel bandit allows an unauthenticated remote attacker to consume server CPU via a content-length value or a Host or :authority port made of thousands of digits. Bandit.Headers.parse_integer/2 in lib/bandit/headers.ex builds the number one digit at a time with no limit on the digit count, allocating a new bignum at each step, so one value costs time quadratic in its length. It runs on raw request input over HTTP/1 and HTTP/2, before any range check. Over HTTP/2, a 4,000-digit value can be stored once in the HPACK dynamic table and re-sent on each new stream for about one byte: 124 KB of traffic kept the server busy for 27.9 s. This issue affects bandit: from 1.0.0-pre.7 before 1.14.0.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-407
Source
CVE List V5
Source checked
Oct 26, 2026
References
5 linked sources
Open source record