CVE-2023-52389

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-01-27 · updated 2026-06-17
Weakness: CWE-190

Description

UTF32Encoding.cpp in POCO has a Poco::UTF32Encoding integer overflow and resultant stack buffer overflow because Poco::UTF32Encoding::convert() and Poco::UTF32::queryConvert() may return a negative integer if a UTF-32 byte sequence evaluates to a value of 0x80000000 or higher. This is fixed in 1.11.8p2, 1.12.5p2, and 1.13.0.

Affected products

poco: before 1.11.8; from 1.12.0 before 1.12.5; 1.11.8, 1.11.8-p1, 1.12.5 — fixed in 1.11.8, 1.12.5

How to fix

Upgrade to a fixed version: poco 1.11.8, 1.12.5. Check the vendor advisory for mitigations.

References

https://github.com/pocoproject/poco/compare/poco-1.12.5p2-release...poco-1.13.0-release
https://github.com/pocoproject/poco/issues/4320
https://pocoproject.org/blog/?p=1226
https://github.com/pocoproject/poco/compare/poco-1.12.5p2-release...poco-1.13.0-release
https://github.com/pocoproject/poco/issues/4320
https://lists.debian.org/debian-lts-announce/2025/01/msg00017.html
https://pocoproject.org/blog/?p=1226

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