# CVE-2023-4813: Glibc: potential use-after-free in gaih_inet() > A use-after-free flaw in glibc's gaih_inet function can cause application crashes when specific nsswitch.conf settings are used. - **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 12 Sep 2023 - **Updated:** 14 Oct 2026 - **Also known as:** AZL-28829, DEBIAN-CVE-2023-4813, GHSA-qx6j-g797-jg9r, MINI-24rg-jcgw-h9w7, RHBA-2024:2413, ROOT-OS-DEBIAN-11-CVE-2023-4813, SUSE-RU-2023:4063-1, SUSE-SU-2023:4047-1, SUSE-SU-2023:4110-1, UBUNTU-CVE-2023-4813, USN-6541-2 ## What is CVE-2023-4813? CVE-2023-4813 is a medium-severity use after free vulnerability in Fedoraproject Fedora, published on 12 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A flaw has been identified in glibc. In an uncommon situation, the gaih_inet function may use memory that has been freed, resulting in an application crash. This issue is only exploitable when the getaddrinfo function is called and the hosts database in /etc/nsswitch.conf is configured with SUCCESS=continue or SUCCESS=merge. Weakness: CWE-416 (Use After Free) ## Which versions are affected by CVE-2023-4813? It affects 16 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `glibc-benchtests-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-common-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-debugsource` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-devel` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-doc` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-gconv-extra-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-headers` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-locale-source` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-utils` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc-utils-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `libnsl-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `nscd-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `nss_db-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `nss_hesiod-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.34-100.el9 | | `glibc` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-all-langpacks` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-benchtests-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-common` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-common-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-debugsource` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-gconv-extra` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-gconv-extra-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-aa` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-af` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-agr` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-ak` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-am` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-an` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-anp` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-ar` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-as` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-ast` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-ayc` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-az` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-be` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-bem` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-ber` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | | `glibc-langpack-bg` | Red Hat:enterprise_linux:9::baseos | All versions | 0:2.34-100.el9 | Products: Fedoraproject Fedora, Gnu Glibc, Netapp Active Iq Unified Manager, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500s Firmware, Netapp H700s Firmware, Redhat Enterprise Linux, Redhat Enterprise Linux Eus, Redhat Enterprise Linux for Ibm Z Systems Eus S390x, Redhat Enterprise Linux for Ibm Z Systems S390x, Redhat Enterprise Linux for Power Little Endian, Redhat Enterprise Linux for Power Little Endian Eus, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Tus. ## How do I fix CVE-2023-4813? Apply the vendor's patch. ## Is CVE-2023-4813 being exploited? There is no known exploitation of CVE-2023-4813 in the wild and no public exploit code. Public exploit code: - https://github.com/tnishiox/cve-2023-4813 (github_poc): https://github.com/tnishiox/cve-2023-4813 ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild) - [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild) - [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-4813 and fix it if it is affected. What it is: CVE-2023-4813 is a medium-severity use after free vulnerability in Fedoraproject Fedora, published on 12 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2023-4813 in the wild and no public exploit code. Affected product: Fedoraproject Fedora. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2023-4813/ (Markdown: https://insights.sbomify.com/CVE-2023-4813/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-4813 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-4813 - OSV: https://osv.dev/vulnerability/CVE-2023-4813 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-4813/ Summaries are generated and may contain mistakes; the official description above is the record.