Unbounded exponent in decimal enables unauthenticated DoS_CVE-2026-32686

6.9 / 10

MEDIUM

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Description

Uncontrolled Resource Consumption vulnerability in ericmj decimal allows unauthenticated remote Denial of Service.

The decimal library does not bound the exponent on parsed input. Storing a decimal with a very large exponent (e.g. Decimal.new("1e1000000000")) is accepted without error. Subsequent calls to arithmetic functions (Decimal.add/2, Decimal.sub/2, Decimal.div/2), Decimal.to_string/2 with :normal or :xsd format, Decimal.to_integer/1, Decimal.round/3, or Decimal.compare/3 with a threshold allocate memory proportional to the exponent value, which can exhaust available memory and crash the BEAM VM.

Any application that accepts user-supplied decimal input and subsequently performs arithmetic, rounding, conversion to integer, or string formatting on it is exposed. A single malicious request is sufficient to cause an out-of-memory crash.

This issue affects decimal: from 0.1.0 before 3.0.0.

Basic Information

ID CVE-2026-32686

Source EEF

Published May 7, 2026 at 14:04

Affected Product

Vendor ericmj

Product decimal

Version 0.1.0

Affected Versions ericmj decimal 0.1.0
ericmj decimal bc11f4a2b6fb61fc1360a0ab4e79141bba918841

CWE Classification

CWE-400

References

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    "published": "2026-05-07T14:04:47.222Z",
    "modified": "2026-05-07T14:04:47.222Z",
    "type": "cve",
    "title": "Unbounded exponent in decimal enables unauthenticated DoS",
    "source": "EEF",
    "references": "https://github.com/ericmj/decimal/security/advisories/GHSA-rhv4-8758-jx7v\nhttps://cna.erlef.org/cves/CVE-2026-32686.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-32686\nhttps://github.com/ericmj/decimal/commit/6a523f3a73b8c9974540e21c7aa88f1258bb35ae",
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