{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2026-55999 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-55999 is a high-severity memory corruption vulnerability in X.org X Server, published on 8 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-55999 and fix it if it is affected.\n\nWhat it is: CVE-2026-55999 is a high-severity memory corruption vulnerability in X.org X Server, published on 8 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-55999 in the wild and no public exploit code.\n\nAffected product: X.org X Server. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. 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.\n2. 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.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-55999/ (Markdown: https://insights.sbomify.com/CVE-2026-55999/index.md)","id":"CVE-2026-55999","markdown":"https://insights.sbomify.com/CVE-2026-55999/index.md","name":"CVE-2026-55999","record":{"aliases":["ALSA-2026:38486","ALSA-2026:38487","ALSA-2026:38488","AZL-92196","BELL-CVE-2026-55999","CLSA-2026-1784295645","DEBIAN-CVE-2026-55999","ECHO-d009-b514-1211","GHSA-h655-847g-q4f7","OESA-2026-3026","RHSA-2026:38486","RHSA-2026:38487","RHSA-2026:38488","RHSA-2026:49515","RHSA-2026:49516","RHSA-2026:49605","RHSA-2026:49606","RHSA-2026:49608","RHSA-2026:50116","RHSA-2026:50117","RHSA-2026:52392","RHSA-2026:52397","RHSA-2026:53450","RLSA-2026:38486","RLSA-2026:38487","RLSA-2026:38488","ROOT-OS-DEBIAN-11-CVE-2026-55999","ROOT-OS-DEBIAN-12-CVE-2026-55999","SUSE-SU-2026:2792-1","UBUNTU-CVE-2026-55999"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"X.Org display server","requires_auth":"low_privilege","summary":"Local attackers can trigger a heap buffer overflow in the X server via malicious PCX fonts, potentially leading to code execution or privilege escalation.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"suse","cpe":[{"product":"x_server","vendor":"x.org"},{"product":"xwayland","vendor":"x.org"}],"cvss":{"score":8.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-122","name":"Heap-based Buffer Overflow"}],"description":"Local attackers with a X connection able to provide PCX fonts to the X \nserver xorg-server before 21.2.24 and xwayland before 24.1.13 could \ncause a heap buffer overflow via SetFont due to missing glyph boundary checks.","ecosystems":["AlmaLinux:8","AlmaLinux:9","Red Hat:enterprise_linux:8::appstream","Red Hat:enterprise_linux:8::crb","Red Hat:enterprise_linux:9::appstream","Red Hat:enterprise_linux:9::crb","Red Hat:rhel_aus:8.4::appstream","Red Hat:rhel_aus:8.6::appstream","Red Hat:rhel_e4s:8.8::appstream","Red Hat:rhel_e4s:9.2::appstream","Red Hat:rhel_e4s:9.4::appstream","Red Hat:rhel_els:7","Red Hat:rhel_eus:9.6::appstream","Red Hat:rhel_eus:9.6::crb","Red Hat:rhel_eus_long_life:8.4::appstream","Red Hat:rhel_eus_long_life:8.6::appstream","Red Hat:rhel_tus:8.8::appstream","Rocky Linux:8","Rocky Linux:9","SUSE:Linux Enterprise Server 12 SP5-LTSS","SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"xorg-server / xwayland glamor font atlas Heap Buffer Overflow","id":"CVE-2026-55999","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"x.org:x_server","products":["x.org:x_server"],"type":"memory_corruption","year":"2026"},"n_packages":236,"n_references":2,"next":{"headline":"xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()","id":"CVE-2026-56000"},"packages":[{"ecosystem":"AlmaLinux:8","fixed":["1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xdmx","purl":"pkg:rpm/almalinux/xorg-x11-server-Xdmx","source":"ALSA-2026:38487"},{"ecosystem":"AlmaLinux:8","fixed":["1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xephyr","purl":"pkg:rpm/almalinux/xorg-x11-server-Xephyr","source":"ALSA-2026:38487"},{"ecosystem":"AlmaLinux:8","fixed":["1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xnest","purl":"pkg:rpm/almalinux/xorg-x11-server-Xnest","source":"ALSA-2026:38487"},{"ecosystem":"AlmaLinux:8","fixed":["1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xorg","purl":"pkg:rpm/almalinux/xorg-x11-server-Xorg","source":"ALSA-2026:38487"},{"ecosystem":"AlmaLinux:8","fixed":["1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xvfb","purl":"pkg:rpm/almalinux/xorg-x11-server-Xvfb","source":"ALSA-2026:38487"},{"ecosystem":"AlmaLinux:8","fixed":["21.1.3-20.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xwayland","purl":"pkg:rpm/almalinux/xorg-x11-server-Xwayland","source":"ALSA-2026:38488"},{"ecosystem":"AlmaLinux:8","fixed":["1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-common","purl":"pkg:rpm/almalinux/xorg-x11-server-common","source":"ALSA-2026:38487"},{"ecosystem":"AlmaLinux:8","fixed":["1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-devel","purl":"pkg:rpm/almalinux/xorg-x11-server-devel","source":"ALSA-2026:38487"},{"ecosystem":"AlmaLinux:8","fixed":["1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-source","purl":"pkg:rpm/almalinux/xorg-x11-server-source","source":"ALSA-2026:38487"},{"ecosystem":"AlmaLinux:9","fixed":["1.20.11-34.el9_8.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xdmx","purl":"pkg:rpm/almalinux/xorg-x11-server-Xdmx","source":"ALSA-2026:38486"},{"ecosystem":"AlmaLinux:9","fixed":["1.20.11-34.el9_8.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xephyr","purl":"pkg:rpm/almalinux/xorg-x11-server-Xephyr","source":"ALSA-2026:38486"},{"ecosystem":"AlmaLinux:9","fixed":["1.20.11-34.el9_8.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xnest","purl":"pkg:rpm/almalinux/xorg-x11-server-Xnest","source":"ALSA-2026:38486"},{"ecosystem":"AlmaLinux:9","fixed":["1.20.11-34.el9_8.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xorg","purl":"pkg:rpm/almalinux/xorg-x11-server-Xorg","source":"ALSA-2026:38486"},{"ecosystem":"AlmaLinux:9","fixed":["1.20.11-34.el9_8.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xvfb","purl":"pkg:rpm/almalinux/xorg-x11-server-Xvfb","source":"ALSA-2026:38486"},{"ecosystem":"AlmaLinux:9","fixed":["1.20.11-34.el9_8.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-common","purl":"pkg:rpm/almalinux/xorg-x11-server-common","source":"ALSA-2026:38486"},{"ecosystem":"AlmaLinux:9","fixed":["1.20.11-34.el9_8.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-devel","purl":"pkg:rpm/almalinux/xorg-x11-server-devel","source":"ALSA-2026:38486"},{"ecosystem":"AlmaLinux:9","fixed":["1.20.11-34.el9_8.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-source","purl":"pkg:rpm/almalinux/xorg-x11-server-source","source":"ALSA-2026:38486"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server","purl":"pkg:rpm/redhat/xorg-x11-server","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xdmx","purl":"pkg:rpm/redhat/xorg-x11-server-Xdmx","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xdmx-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-Xdmx-debuginfo","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xephyr","purl":"pkg:rpm/redhat/xorg-x11-server-Xephyr","source":"RHSA-2026:38487"},{"ecosystem":"Red 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Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xorg-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-Xorg-debuginfo","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xvfb","purl":"pkg:rpm/redhat/xorg-x11-server-Xvfb","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xvfb-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-Xvfb-debuginfo","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:21.1.3-20.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xwayland","purl":"pkg:rpm/redhat/xorg-x11-server-Xwayland","source":"RHSA-2026:38488"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:21.1.3-20.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xwayland-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-Xwayland-debuginfo","source":"RHSA-2026:38488"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:21.1.3-20.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xwayland-debugsource","purl":"pkg:rpm/redhat/xorg-x11-server-Xwayland-debugsource","source":"RHSA-2026:38488"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-common","purl":"pkg:rpm/redhat/xorg-x11-server-common","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-debuginfo","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-debugsource","purl":"pkg:rpm/redhat/xorg-x11-server-debugsource","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xdmx-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-Xdmx-debuginfo","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xephyr-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-Xephyr-debuginfo","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xnest-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-Xnest-debuginfo","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xorg-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-Xorg-debuginfo","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-Xvfb-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-Xvfb-debuginfo","source":"RHSA-2026:38487"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:1.20.11-28.el8_10.3"],"introduced":["0"],"last_affected":[],"package":"xorg-x11-server-debuginfo","purl":"pkg:rpm/redhat/xorg-x11-server-debuginfo","source":"RHSA-2026:38487"}],"prev":{"headline":"Cluster Existence Oracle via Unauthenticated Import Endpoint","id":"CVE-2026-55998"},"products":["xorg-server","xwayland"],"published":"2026-07-08","related":[{"cvss_score":9,"headline":"xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()","id":"CVE-2026-56000","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":8.8,"headline":"Memory corruption in n/a","id":"CVE-2017-10971","kev_date_added":null,"published":"2017-07-06"},{"cvss_score":7.8,"headline":"Memory corruption in xorg-x11-server","id":"CVE-2022-2319","kev_date_added":null,"published":"2022-09-01"},{"cvss_score":7.8,"headline":"Memory corruption in xorg-x11-server","id":"CVE-2022-2320","kev_date_added":null,"published":"2022-09-01"},{"cvss_score":7.8,"headline":"Memory corruption in xorg-x11-server","id":"CVE-2020-14360","kev_date_added":null,"published":"2021-01-20"},{"cvss_score":7.8,"headline":"Memory corruption in n/a","id":"CVE-2019-17624","kev_date_added":null,"published":"2019-10-16"}],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-09","vendors":["X.Org"]},"summary":"Local attackers can trigger a heap buffer overflow in the X server via malicious PCX fonts, potentially leading to code execution or privilege escalation.","url":"https://insights.sbomify.com/CVE-2026-55999/"}