---
id: "CVE-2026-115456"
kind: "vulnerability"
aliases: ["CVE-2026-115456"]
title: "GCC libstdc++: non-terminated string to from_chars crashes applications"
severity: "low"
cvss: 3.7
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["c++", "gcc", "libstdc++", "runtime"]
not_affected_if: ["no-from-chars-calls"]
published_at: "2026-10-30T09:17:14+00:00"
first_seen_at: "2026-10-30T09:29:38+00:00"
updated_at: "2026-10-30T09:30:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115456", "first_seen_at": "2026-10-30T09:29:38+00:00"}]
---

# GCC libstdc++: non-terminated string to from_chars crashes applications

A flaw in the libstdc++ library shipped with GCC lets an attacker pass a string that is not null-terminated to std::from_chars(). The out-of-bounds read can crash the application or cause it to parse invalid data.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- `gcc --version` to see which GCC release the build uses
- Search your code and dependencies for calls to `std::from_chars`

## Timeline

- 2026-10-30T09:29:38+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115456

## From the sources

A flaw was found in gcc. An attacker could cause a Denial of Service (DoS) by passing a string that is not null-terminated to the std::from_chars() function in the libstdc++ library. This issue triggers an out-of-bounds read beyond the allocated buffer, potentially leading to invalid data parsing or an application crash.

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