{"answers":{"affected":"2 open source packages ship an affected version, including org.jenkins-ci.plugins:matrix-auth. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-42521 in the wild and no public exploit code.","fix":"Upgrade org.jenkins-ci.plugins:matrix-auth to 3.2.10 or later.","what":"CVE-2026-42521 is a medium-severity unsafe deserialization vulnerability in Jenkins Matrix Authorization Strategy Plugin, published on 29 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-42521 and fix it if it is affected.\n\nWhat it is: CVE-2026-42521 is a medium-severity unsafe deserialization vulnerability in Jenkins Matrix Authorization Strategy Plugin, published on 29 Apr 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-2026-42521 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.jenkins-ci.plugins:matrix-auth (Maven): affected from 2.0-beta-1; fixed in 3.2.10\n- org.jenkins-ci.plugins:matrix-auth (Maven): affected from 2.0-beta-1; fixed in 3.2.10\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-2026-42521/ (Markdown: https://insights.sbomify.com/CVE-2026-42521/index.md)","id":"CVE-2026-42521","markdown":"https://insights.sbomify.com/CVE-2026-42521/index.md","name":"CVE-2026-42521","record":{"aliases":["GHSA-jp9r-mmhw-vff3","MINI-296j-xcj5-c6fx","MINI-48r4-8gfg-hrv3","MINI-8jp9-r8p3-7c27","MINI-vmw5-xhj6-w276","MINI-w3rq-69qj-f5j9","MINI-wj36-455g-926q","MINI-wq9h-4xfh-w9qr"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["data_read","other"],"network_reachable":"yes","non_default_config":false,"product_category":"Jenkins authorization plugin","requires_auth":"low_privilege","summary":"Attackers with configure permissions can instantiate arbitrary classes via unsafe deserialization, potentially leading to information disclosure.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jenkins","cpe":[{"product":"matrix_authorization_strategy","vendor":"jenkins"}],"cvss":{"score":6.5,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"Jenkins Matrix Authorization Strategy Plugin 2.0-beta-1 through 3.2.9 (both inclusive) invokes parameterless constructors of classes specified in configuration when deserializing inheritance strategies, without restricting the classes that can be instantiated, allowing attackers with Item/Configure permission to instantiate arbitrary types, which may lead to information disclosure or other impacts depending on the classes available on the classpath.","ecosystems":["Maven"],"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":"Jenkins Matrix Authorization Strategy Plugin: Unsafe deserialization allows invocation of parameterless constructors","id":"CVE-2026-42521","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":2,"n_references":1,"next":{"headline":"Jenkins GitHub Branch Source Plugin: Missing permissions check allows attackers to perform a connection test","id":"CVE-2026-42522"},"packages":[{"ecosystem":"Maven","fixed":["3.2.10"],"introduced":["2.0-beta-1"],"last_affected":[],"package":"org.jenkins-ci.plugins:matrix-auth","purl":null,"source":"GHSA-jp9r-mmhw-vff3"},{"ecosystem":"Maven","fixed":["3.2.10"],"introduced":["2.0-beta-1"],"last_affected":[],"package":"org.jenkins-ci.plugins:matrix-auth","purl":"pkg:maven/org.jenkins-ci.plugins/matrix-auth","source":"GHSA-jp9r-mmhw-vff3"}],"prev":{"headline":"Jenkins Credentials Binding Plugin has a path traversal vulnerability","id":"CVE-2026-42520"},"products":["Jenkins Matrix Authorization Strategy Plugin"],"published":"2026-04-29","related":[{"cvss_score":6.5,"headline":"Incorrect permission checks in Jenkins Matrix Authorization Strategy Plugin may allow accessing some items","id":"CVE-2021-21623","kev_date_added":null,"published":"2021-03-18"},{"cvss_score":5.4,"headline":"Stored XSS vulnerability in Jenkins Matrix Authorization Strategy Plugin","id":"CVE-2020-2226","kev_date_added":null,"published":"2020-07-15"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":"partial"},"state":"PUBLISHED","updated":"2026-04-29","vendors":["Jenkins Project"]},"summary":"Attackers with configure permissions can instantiate arbitrary classes via unsafe deserialization, potentially leading to information disclosure.","url":"https://insights.sbomify.com/CVE-2026-42521/"}