{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-34743 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-34743 is a low-severity memory corruption vulnerability in tukaani-project xz, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-34743 and fix it if it is affected.\n\nWhat it is: CVE-2026-34743 is a low-severity memory corruption vulnerability in tukaani-project xz, published on 2 Apr 2026. 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-2026-34743 in the wild and no public exploit code.\n\nAffected product: tukaani-project xz. 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-2026-34743/ (Markdown: https://insights.sbomify.com/CVE-2026-34743/index.md)","id":"CVE-2026-34743","markdown":"https://insights.sbomify.com/CVE-2026-34743/index.md","name":"CVE-2026-34743","record":{"aliases":["ALPINE-CVE-2026-34743","ALSA-2026:64787","ALSA-2026:89749","AZL-81800","AZL-81905","AZL-81908","BELL-CVE-2026-34743","CLEANSTART-2026-NK46628","CLSA-2026-1779894244","CLSA-2026-1780518704","DEBIAN-CVE-2026-34743","ECHO-54f0-42da-6974","GHSA-x872-m794-cxhv","JLSEC-2026-462","MGASA-2026-0084","OESA-2026-1853","RHSA-2026:64787","RHSA-2026:7647","RLSA-2026:64787","RLSA-2026:89749","SUSE-SU-2026:2051-1","SUSE-SU-2026:2052-1","SUSE-SU-2026:2118-1","SUSE-SU-2026:21729-1","SUSE-SU-2026:21740-1","SUSE-SU-2026:21835-1","SUSE-SU-2026:21848-1","UBUNTU-CVE-2026-34743","USN-8362-1","openSUSE-SU-2026:10492-1","openSUSE-SU-2026:20813-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"XZ compression library","requires_auth":"none","summary":"A buffer overflow in XZ Utils allows attackers to execute arbitrary code or cause denial of service via crafted compressed data.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"xz","vendor":"tukaani"}],"cvss":{"score":1.7,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","version":"4.0"},"cwes":[{"id":"CWE-122","name":"Heap-based Buffer Overflow"}],"description":"XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.","ecosystems":["AlmaLinux:10","AlmaLinux:9","Red Hat:enterprise_linux:10.2","Red Hat:hummingbird:1","Rocky Linux:10","Rocky Linux:9","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":"XZ Utils: Buffer overflow in lzma_index_append()","id":"CVE-2026-34743","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":24,"n_references":3,"next":{"headline":"MantisBT authorization bypass allows continued access to self-uploaded attachments on private issues","id":"CVE-2026-34744"},"packages":[{"ecosystem":"AlmaLinux:10","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz","purl":"pkg:rpm/almalinux/xz","source":"ALSA-2026:64787"},{"ecosystem":"AlmaLinux:10","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-devel","purl":"pkg:rpm/almalinux/xz-devel","source":"ALSA-2026:64787"},{"ecosystem":"AlmaLinux:10","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-libs","purl":"pkg:rpm/almalinux/xz-libs","source":"ALSA-2026:64787"},{"ecosystem":"AlmaLinux:10","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-lzma-compat","purl":"pkg:rpm/almalinux/xz-lzma-compat","source":"ALSA-2026:64787"},{"ecosystem":"AlmaLinux:9","fixed":["5.2.5-8.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"xz","purl":"pkg:rpm/almalinux/xz","source":"ALSA-2026:89749"},{"ecosystem":"AlmaLinux:9","fixed":["5.2.5-8.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"xz-devel","purl":"pkg:rpm/almalinux/xz-devel","source":"ALSA-2026:89749"},{"ecosystem":"AlmaLinux:9","fixed":["5.2.5-8.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"xz-libs","purl":"pkg:rpm/almalinux/xz-libs","source":"ALSA-2026:89749"},{"ecosystem":"AlmaLinux:9","fixed":["5.2.5-8.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"xz-lzma-compat","purl":"pkg:rpm/almalinux/xz-lzma-compat","source":"ALSA-2026:89749"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz","purl":"pkg:rpm/redhat/xz","source":"RHSA-2026:64787"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-debuginfo","purl":"pkg:rpm/redhat/xz-debuginfo","source":"RHSA-2026:64787"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-debugsource","purl":"pkg:rpm/redhat/xz-debugsource","source":"RHSA-2026:64787"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-devel","purl":"pkg:rpm/redhat/xz-devel","source":"RHSA-2026:64787"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-libs","purl":"pkg:rpm/redhat/xz-libs","source":"RHSA-2026:64787"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-libs-debuginfo","purl":"pkg:rpm/redhat/xz-libs-debuginfo","source":"RHSA-2026:64787"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-lzma-compat","purl":"pkg:rpm/redhat/xz-lzma-compat","source":"RHSA-2026:64787"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz-lzma-compat-debuginfo","purl":"pkg:rpm/redhat/xz-lzma-compat-debuginfo","source":"RHSA-2026:64787"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:5.8.3-1.1.hum1"],"introduced":["0"],"last_affected":[],"package":"xz","purl":"pkg:rpm/redhat/xz","source":"RHSA-2026:7647"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:5.8.3-1.1.hum1"],"introduced":["0"],"last_affected":[],"package":"xz-devel","purl":"pkg:rpm/redhat/xz-devel","source":"RHSA-2026:7647"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:5.8.3-1.1.hum1"],"introduced":["0"],"last_affected":[],"package":"xz-libs","purl":"pkg:rpm/redhat/xz-libs","source":"RHSA-2026:7647"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:5.8.3-1.1.hum1"],"introduced":["0"],"last_affected":[],"package":"xz-lzma-compat","purl":"pkg:rpm/redhat/xz-lzma-compat","source":"RHSA-2026:7647"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:5.8.3-1.1.hum1"],"introduced":["0"],"last_affected":[],"package":"xz-static","purl":"pkg:rpm/redhat/xz-static","source":"RHSA-2026:7647"},{"ecosystem":"Rocky Linux:10","fixed":["1:5.6.2-4.el10_2.1"],"introduced":["0"],"last_affected":[],"package":"xz","purl":"pkg:rpm/rocky-linux/xz?distro=rocky-linux-10\u0026epoch=1","source":"RLSA-2026:64787"},{"ecosystem":"Rocky Linux:9","fixed":["0:5.2.5-8.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"xz","purl":"pkg:rpm/rocky-linux/xz?distro=rocky-linux-9\u0026epoch=0","source":"RLSA-2026:89749"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["5.8.3-1.1"],"introduced":["0"],"last_affected":[],"package":"xz","purl":"pkg:rpm/opensuse/xz\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:10492-1"}],"prev":{"headline":"Model Context Protocol Go SDK: DNS Rebinding Protection Disabled by Default for Servers Running on Localhost","id":"CVE-2026-34742"},"products":["xz"],"published":"2026-04-02","related":[{"cvss_score":10,"headline":"Xz: malicious code in distributed source","id":"CVE-2024-3094","kev_date_added":null,"published":"2024-03-29"},{"cvss_score":7.8,"headline":"Command injection in n/a","id":"CVE-2015-4035","kev_date_added":null,"published":"2017-07-25"},{"cvss_score":5.5,"headline":"Denial of service in n/a","id":"CVE-2020-22916","kev_date_added":null,"published":"2023-08-22"}],"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":"BSD","name":"Rocky Linux","prefix":"RLSA"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-21","vendors":["tukaani-project"]},"summary":"A buffer overflow in XZ Utils allows attackers to execute arbitrary code or cause denial of service via crafted compressed data.","url":"https://insights.sbomify.com/CVE-2026-34743/"}