{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-26937 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-26937 is a critical memory corruption vulnerability in Debian Debian Linux, published on 9 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-26937 and fix it if it is affected.\n\nWhat it is: CVE-2021-26937 is a critical memory corruption vulnerability in Debian Debian Linux, published on 9 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-26937 in the wild and no public exploit code.\n\nAffected product: Debian Debian Linux. 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-2021-26937/ (Markdown: https://insights.sbomify.com/CVE-2021-26937/index.md)","id":"CVE-2021-26937","markdown":"https://insights.sbomify.com/CVE-2021-26937/index.md","name":"CVE-2021-26937","record":{"aliases":["ALPINE-CVE-2021-26937","AZL-7356","CLSA-2021-1618497131","CLSA-2021-1634925515","DEBIAN-CVE-2021-26937","DLA-2570-1","DSA-4861-1","GHSA-pjrj-fmxp-cmc4","MGASA-2021-0109","OESA-2021-1090","RHSA-2021:0742","RHSA-2022:1074","SUSE-SU-2021:0491-1","SUSE-SU-2021:0492-1","UBUNTU-CVE-2021-26937","USN-4747-1","USN-4747-2","openSUSE-SU-2021:0304-1","openSUSE-SU-2024:11884-1"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"GNU Screen terminal","requires_auth":"none","summary":"Remote attackers can cause a denial of service in GNU Screen via crafted UTF-8 sequences, leading to application crashes.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"fedora","vendor":"fedoraproject"},{"product":"screen","vendor":"gnu"}],"cvss":{"score":9.8,"severity":"critical","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-88","name":"Improper Neutralization of Argument Delimiters in a Command"}],"description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","ecosystems":["Red Hat:enterprise_linux:7::client","Red Hat:enterprise_linux:7::server","Red Hat:enterprise_linux:7::workstation","Red Hat:rhel_aus:7.7::server","Red Hat:rhel_e4s:7.7::server","Red Hat:rhel_tus:7.7::server","SUSE:Enterprise Storage 6","SUSE:HPE Helion OpenStack 8","SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS","SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS","SUSE:Linux Enterprise High Performance Computing 15-ESPOS","SUSE:Linux Enterprise High Performance Computing 15-LTSS","SUSE:Linux Enterprise Module for Basesystem 15 SP2","SUSE:Linux Enterprise Server 12 SP2-BCL","SUSE:Linux Enterprise Server 12 SP2-LTSS","SUSE:Linux Enterprise Server 12 SP3-BCL","SUSE:Linux Enterprise Server 12 SP3-LTSS","SUSE:Linux Enterprise Server 12 SP4-LTSS","SUSE:Linux Enterprise Server 12 SP5","SUSE:Linux Enterprise Server 15 SP1-BCL","SUSE:Linux Enterprise Server 15 SP1-LTSS","SUSE:Linux Enterprise Server 15-LTSS","SUSE:Linux Enterprise Server for SAP Applications 12 SP2","SUSE:Linux Enterprise Server for SAP Applications 12 SP3","SUSE:Linux Enterprise Server for SAP Applications 12 SP4","SUSE:Linux Enterprise Server for SAP Applications 12 SP5","SUSE:Linux Enterprise Server for SAP Applications 15","SUSE:Linux Enterprise Server for SAP Applications 15 SP1","SUSE:Manager Proxy 4.0","SUSE:Manager Retail Branch Server 4.0","SUSE:Manager Server 4.0","SUSE:OpenStack Cloud 7","SUSE:OpenStack Cloud 8","SUSE:OpenStack Cloud 9","SUSE:OpenStack Cloud Crowbar 8","SUSE:OpenStack Cloud Crowbar 9","openSUSE:Leap 15.2","openSUSE:Tumbleweed"],"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":"Memory corruption in n/a","id":"CVE-2021-26937","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","fedoraproject:fedora"],"type":"memory_corruption","year":"2021"},"n_packages":44,"n_references":9,"next":{"headline":"Cross-site scripting in n/a","id":"CVE-2021-26938"},"packages":[{"ecosystem":"Red Hat:enterprise_linux:7::client","fixed":["0:4.1.0-0.27.20120314git3c2946.el7_9"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/redhat/screen","source":"RHSA-2021:0742"},{"ecosystem":"Red Hat:enterprise_linux:7::client","fixed":["0:4.1.0-0.27.20120314git3c2946.el7_9"],"introduced":["0"],"last_affected":[],"package":"screen-debuginfo","purl":"pkg:rpm/redhat/screen-debuginfo","source":"RHSA-2021:0742"},{"ecosystem":"Red Hat:enterprise_linux:7::server","fixed":["0:4.1.0-0.27.20120314git3c2946.el7_9"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/redhat/screen","source":"RHSA-2021:0742"},{"ecosystem":"Red Hat:enterprise_linux:7::server","fixed":["0:4.1.0-0.27.20120314git3c2946.el7_9"],"introduced":["0"],"last_affected":[],"package":"screen-debuginfo","purl":"pkg:rpm/redhat/screen-debuginfo","source":"RHSA-2021:0742"},{"ecosystem":"Red Hat:enterprise_linux:7::workstation","fixed":["0:4.1.0-0.27.20120314git3c2946.el7_9"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/redhat/screen","source":"RHSA-2021:0742"},{"ecosystem":"Red Hat:enterprise_linux:7::workstation","fixed":["0:4.1.0-0.27.20120314git3c2946.el7_9"],"introduced":["0"],"last_affected":[],"package":"screen-debuginfo","purl":"pkg:rpm/redhat/screen-debuginfo","source":"RHSA-2021:0742"},{"ecosystem":"Red Hat:rhel_aus:7.7::server","fixed":["0:4.1.0-0.25.20120314git3c2946.el7_7.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/redhat/screen","source":"RHSA-2022:1074"},{"ecosystem":"Red Hat:rhel_aus:7.7::server","fixed":["0:4.1.0-0.25.20120314git3c2946.el7_7.1"],"introduced":["0"],"last_affected":[],"package":"screen-debuginfo","purl":"pkg:rpm/redhat/screen-debuginfo","source":"RHSA-2022:1074"},{"ecosystem":"Red Hat:rhel_e4s:7.7::server","fixed":["0:4.1.0-0.25.20120314git3c2946.el7_7.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/redhat/screen","source":"RHSA-2022:1074"},{"ecosystem":"Red Hat:rhel_e4s:7.7::server","fixed":["0:4.1.0-0.25.20120314git3c2946.el7_7.1"],"introduced":["0"],"last_affected":[],"package":"screen-debuginfo","purl":"pkg:rpm/redhat/screen-debuginfo","source":"RHSA-2022:1074"},{"ecosystem":"Red Hat:rhel_tus:7.7::server","fixed":["0:4.1.0-0.25.20120314git3c2946.el7_7.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/redhat/screen","source":"RHSA-2022:1074"},{"ecosystem":"Red Hat:rhel_tus:7.7::server","fixed":["0:4.1.0-0.25.20120314git3c2946.el7_7.1"],"introduced":["0"],"last_affected":[],"package":"screen-debuginfo","purl":"pkg:rpm/redhat/screen-debuginfo","source":"RHSA-2022:1074"},{"ecosystem":"SUSE:Enterprise Storage 6","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Enterprise%20Storage%206","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:HPE Helion OpenStack 8","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=HPE%20Helion%20OpenStack%208","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOS","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSS","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15-ESPOS","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOS","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15-LTSS","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSS","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP2","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2-BCL","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCL","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2-LTSS","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSS","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP3-BCL","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCL","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP3-LTSS","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSS","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP4-LTSS","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSS","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP5","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP1-BCL","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCL","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP1-LTSS","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSS","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15-LTSS","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSS","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP2","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP3","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP4","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP5","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP1","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Manager Proxy 4.0","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Manager%20Proxy%204.0","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Manager Retail Branch Server 4.0","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:Manager Server 4.0","fixed":["4.6.2-5.3.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20Manager%20Server%204.0","source":"SUSE-SU-2021:0492-1"},{"ecosystem":"SUSE:OpenStack Cloud 7","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20OpenStack%20Cloud%207","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:OpenStack Cloud 8","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20OpenStack%20Cloud%208","source":"SUSE-SU-2021:0491-1"},{"ecosystem":"SUSE:OpenStack Cloud 9","fixed":["4.0.4-23.6.1"],"introduced":["0"],"last_affected":[],"package":"screen","purl":"pkg:rpm/suse/screen\u0026distro=SUSE%20OpenStack%20Cloud%209","source":"SUSE-SU-2021:0491-1"}],"prev":{"headline":"Privilege escalation in n/a","id":"CVE-2021-26936"},"products":["n/a"],"published":"2021-02-09","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"sources":[{"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":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2025-05-09","vendors":["n/a"]},"summary":"Remote attackers can cause a denial of service in GNU Screen via crafted UTF-8 sequences, leading to application crashes.","url":"https://insights.sbomify.com/CVE-2021-26937/"}