# CVE-2021-27219: glib2: GLib provides the core application building blocks for libraries and applications written in C CVE-2021-27219 is fixed in 15 products on 1 platform, first by libglib2.0-0 2.56.4-0ubuntu0.18.04.7, released February 15, 2021. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2021-27219 - Priority: High - CVSS: 9.8 (Important) - EPSS: 0.0306 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Feb 15, 2021 ## Description GLib provides the core application building blocks for libraries and applications written in C. It provides the core object system used in GNOME, the main loop implementation, and a large set of utility functions for strings and common data structures. Security Fix(es): * glib: integer overflow in g_bytes_new function on 64-bit platforms due to an implicit cast from 64 bits to 32 bits (CVE-2021-27219) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * Refcounting issue causes crashes and slow workarounds (BZ#1953553) ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | glib2 RHEL 8 | 0:2.56.4-10.el8_4 | [RHSA-2021:2170](https://patchblox.com/security/data/fix/linux/rhsa-2021-2170.md) | Jun 1, 2021 | | Linux | glib2 ol 8 | 0:2.56.4-10.el8_4 | [ELSA-2021-2170](https://patchblox.com/security/data/fix/linux/elsa-2021-2170.md) | Jun 2, 2021 | | Linux | glib2-devel RHEL 8 | 0:2.56.4-10.el8_4 | [RHSA-2021:2170](https://patchblox.com/security/data/fix/linux/rhsa-2021-2170.md) | Jun 1, 2021 | | Linux | glib2-devel ol 8 | 0:2.56.4-10.el8_4 | [ELSA-2021-2170](https://patchblox.com/security/data/fix/linux/elsa-2021-2170.md) | Jun 2, 2021 | | Linux | glib2-doc RHEL 8 | 0:2.56.4-10.el8_4 | [RHSA-2021:2170](https://patchblox.com/security/data/fix/linux/rhsa-2021-2170.md) | Jun 1, 2021 | | Linux | glib2-doc ol 8 | 0:2.56.4-10.el8_4 | [ELSA-2021-2170](https://patchblox.com/security/data/fix/linux/elsa-2021-2170.md) | Jun 2, 2021 | | Linux | glib2-fam RHEL 8 | 0:2.56.4-10.el8_4 | [RHSA-2021:2170](https://patchblox.com/security/data/fix/linux/rhsa-2021-2170.md) | Jun 1, 2021 | | Linux | glib2-fam ol 8 | 0:2.56.4-10.el8_4 | [ELSA-2021-2170](https://patchblox.com/security/data/fix/linux/elsa-2021-2170.md) | Jun 2, 2021 | | Linux | glib2-static RHEL 8 | 0:2.56.4-10.el8_4 | [RHSA-2021:2170](https://patchblox.com/security/data/fix/linux/rhsa-2021-2170.md) | Jun 1, 2021 | | Linux | glib2-static ol 8 | 0:2.56.4-10.el8_4 | [ELSA-2021-2170](https://patchblox.com/security/data/fix/linux/elsa-2021-2170.md) | Jun 2, 2021 | | Linux | glib2-tests RHEL 8 | 0:2.56.4-10.el8_4 | [RHSA-2021:2170](https://patchblox.com/security/data/fix/linux/rhsa-2021-2170.md) | Jun 1, 2021 | | Linux | glib2-tests ol 8 | 0:2.56.4-10.el8_4 | [ELSA-2021-2170](https://patchblox.com/security/data/fix/linux/elsa-2021-2170.md) | Jun 2, 2021 | | Linux | libglib2.0-0 Ubuntu 18.04.6 LTS (bionic) | 2.56.4-0ubuntu0.18.04.7 | [libglib2.0-0 2.56.4-0ubuntu0.18.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libglib2.0-0-2.56.4-0ubuntu0.18.04.7.md) | Feb 15, 2021 | | Linux | libglib2.0-0 Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.2 | [libglib2.0-0 2.64.6-1~ubuntu20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-0-2.64.6-1-ubuntu20.04.2.md) | Feb 15, 2021 | | Linux | libglib2.0-bin Ubuntu 18.04.6 LTS (bionic) | 2.56.4-0ubuntu0.18.04.7 | [libglib2.0-bin 2.56.4-0ubuntu0.18.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libglib2.0-bin-2.56.4-0ubuntu0.18.04.7.md) | Feb 15, 2021 | | Linux | libglib2.0-bin Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.2 | [libglib2.0-bin 2.64.6-1~ubuntu20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-bin-2.64.6-1-ubuntu20.04.2.md) | Feb 15, 2021 | | Linux | libglib2.0-data Ubuntu 18.04.6 LTS (bionic) | 2.56.4-0ubuntu0.18.04.7 | [libglib2.0-data 2.56.4-0ubuntu0.18.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libglib2.0-data-2.56.4-0ubuntu0.18.04.7.md) | Feb 15, 2021 | | Linux | libglib2.0-data Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.2 | [libglib2.0-data 2.64.6-1~ubuntu20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-data-2.64.6-1-ubuntu20.04.2.md) | Feb 15, 2021 | | Linux | libglib2.0-dev-bin Ubuntu 18.04.6 LTS (bionic) | 2.56.4-0ubuntu0.18.04.7 | [libglib2.0-dev-bin 2.56.4-0ubuntu0.18.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libglib2.0-dev-bin-2.56.4-0ubuntu0.18.04.7.md) | Feb 15, 2021 | | Linux | libglib2.0-dev-bin Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.2 | [libglib2.0-dev-bin 2.64.6-1~ubuntu20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-dev-bin-2.64.6-1-ubuntu20.04.2.md) | Feb 15, 2021 | | Linux | libglib2.0-tests Ubuntu 18.04.6 LTS (bionic) | 2.56.4-0ubuntu0.18.04.7 | [libglib2.0-tests 2.56.4-0ubuntu0.18.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libglib2.0-tests-2.56.4-0ubuntu0.18.04.7.md) | Feb 15, 2021 | | Linux | libglib2.0-tests Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.2 | [libglib2.0-tests 2.64.6-1~ubuntu20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-tests-2.64.6-1-ubuntu20.04.2.md) | Feb 15, 2021 | | Linux | mingw32-glib2 RHEL 8 | 0:2.66.7-2.el8 | [RHSA-2021:4526](https://patchblox.com/security/data/fix/linux/rhsa-2021-4526.md) | Nov 9, 2021 | | Linux | mingw32-glib2-static RHEL 8 | 0:2.66.7-2.el8 | [RHSA-2021:4526](https://patchblox.com/security/data/fix/linux/rhsa-2021-4526.md) | Nov 9, 2021 | | Linux | mingw64-glib2 RHEL 8 | 0:2.66.7-2.el8 | [RHSA-2021:4526](https://patchblox.com/security/data/fix/linux/rhsa-2021-4526.md) | Nov 9, 2021 | | Linux | mingw64-glib2-static RHEL 8 | 0:2.66.7-2.el8 | [RHSA-2021:4526](https://patchblox.com/security/data/fix/linux/rhsa-2021-4526.md) | Nov 9, 2021 | --- Data as of 2026-11-09T07:25:28Z UTC. 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