# CVE-2026-115455: Gcc: stack overflow in std::bitset on libstdc++

CVE-2026-115455 is fixed in 41 products on 1 platform, first by RHSA-2026:98648, released November 12, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-115455
- Priority: Routine
- CVSS: 6.5 (Moderate)
- EPSS: 0.0031
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 28, 2026
- Weakness: Out-of-bounds Write
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-115455

## Description

A flaw was found in GCC libstdc++. When an application extracts data into a bitset from a wide-character stream, internal stack memory allocation fails to properly account for character size and alignment. An attacker capable of supplying crafted input to an affected application could trigger a stack-based buffer overflow leading denial of service (DoS).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gcc RHEL 10 | 14.4.1-5.el10_3 | [RHSA-2026:98648](https://patchblox.com/security/data/fix/linux/rhsa-2026-98648.md) | Nov 12, 2026 |
| Linux | gcc-toolset RHEL 10 | 16-gcc-0:16.2.1-1.4.el10_3 | [RHSA-2026:98640](https://patchblox.com/security/data/fix/linux/rhsa-2026-98640.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-gcc RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-gcc-c++ RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-gcc-gfortran RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-gcc-plugin-annobin RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-gcc-plugin-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libasan-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libatomic-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libgccjit RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libgccjit-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libitm-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-liblsan-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libquadmath-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libstdc++-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libstdc++-docs RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libtsan-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-libubsan-devel RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-15-offload-nvptx RHEL 9 | 0:15.2.1-7.4.el9_9 | [RHSA-2026:98526](https://patchblox.com/security/data/fix/linux/rhsa-2026-98526.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-gcc RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-gcc-c++ RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-gcc-gfortran RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-gcc-plugin-annobin RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-gcc-plugin-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libasan-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libatomic-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libgccjit RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libgccjit-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libgdiagnostics-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libitm-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-liblsan-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libquadmath-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libstdc++-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libstdc++-docs RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libtsan-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-libubsan-devel RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | gcc-toolset-16-offload-nvptx RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | libasan8 RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | libgdiagnostics RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | liblsan RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |
| Linux | libtsan2 RHEL 9 | 0:16.2.1-1.4.el9_9 | [RHSA-2026:98534](https://patchblox.com/security/data/fix/linux/rhsa-2026-98534.md) | Nov 12, 2026 |

---

Data as of 2026-11-12T07:53:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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