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

• Severity: low (CVSS 2.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-16
• Weakness: CWE-190

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.

Affected products

• d99kris rapidcsv: before 8.99

References

• https://github.com/d99kris/rapidcsv/commit/68f57cc6c83d5e0992904398822453489d8dfac1
• https://github.com/d99kris/rapidcsv/issues/220
• https://github.com/d99kris/rapidcsv/releases/tag/v8.99
• https://github.com/d99kris/rapidcsv/security/advisories/GHSA-v83v-8j5q-6553

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