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CVE-2026-49206— rapidcsv: Integer overflow in iterator arithmetic causes out-of-bounds access

Quick assessment

Affected
d99kris rapidcsv
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rapidcsv is a C++ CSV parser library. Prior to 8.99, RemoveColumn, InsertColumn, RemoveRow, InsertRow, and GetColumnNames converted size_t indexes to int before adding them to std::vector iterators. On 64-bit systems, in a CSV matrix dimension containing more

CVSS 2.9 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
d99kris rapidcsv < 8.99 affected
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I. Basic Information for CVE-2026-49206

Vulnerability Information

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Vulnerability Title
rapidcsv: Integer overflow in iterator arithmetic causes out-of-bounds access
Source: CVE Program / CVE List V5
Vulnerability Description
rapidcsv is a C++ CSV parser library. Prior to 8.99, RemoveColumn, InsertColumn, RemoveRow, InsertRow, and GetColumnNames converted size_t indexes to int before adding them to std::vector iterators. On 64-bit systems, in a CSV matrix dimension containing more than 2^31 elements, an index above INT_MAX could wrap to a negative iterator offset and point before the start of the vector, causing undefined behavior, heap memory corruption, or a crash. Triggering the issue requires an extremely large in-memory document, requiring tens of gigabytes of memory at minimum, so typical CSV documents are not practically affected. This issue is fixed in version 8.99.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
d99kris rapidcsv < 8.99 -

II. Public POCs for CVE-2026-49206

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III. Intelligence Information for CVE-2026-49206

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Patches & Fixes for CVE-2026-49206 (1)

Other References for CVE-2026-49206 (3)

IV. Related Vulnerabilities

Same weakness: CWE-190

V. Comments for CVE-2026-49206

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