{"answers":{"affected":"10 open source packages ship an affected version, including com.fasterxml.jackson.core:jackson-databind and tools.jackson.core:jackson-databind.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91776 exists.","fix":"Upgrade com.fasterxml.jackson.core:jackson-databind to a fixed version for your release line: 2.18.11, 2.21.7 or 2.22.3.","what":"CVE-2026-91776 is a high-severity denial of service vulnerability in FasterXML jackson-databind, published on 23 Sep 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-2026-91776 and fix it if it is affected.\n\nWhat it is: CVE-2026-91776 is a high-severity denial of service vulnerability in FasterXML jackson-databind, published on 23 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91776 exists.\n\nAffected packages and fixed versions:\n- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.0.0; fixed in 2.18.11\n- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.0.0; fixed in 2.18.11\n- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.19.0; fixed in 2.21.7\n- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.19.0; fixed in 2.21.7\n- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.22.0; fixed in 2.22.3\n- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.22.0; fixed in 2.22.3\n- tools.jackson.core:jackson-databind (Maven): affected from 3.0.0; fixed in 3.1.7\n- tools.jackson.core:jackson-databind (Maven): affected from 3.0.0; fixed in 3.1.7\n- tools.jackson.core:jackson-databind (Maven): affected from 3.2.0; fixed in 3.2.3\n- tools.jackson.core:jackson-databind (Maven): affected from 3.2.0; fixed in 3.2.3\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-2026-91776/ (Markdown: https://insights.sbomify.com/CVE-2026-91776/index.md)","id":"CVE-2026-91776","markdown":"https://insights.sbomify.com/CVE-2026-91776/index.md","name":"CVE-2026-91776","record":{"aliases":["CLEANSTART-2026-AA74935","CLEANSTART-2026-AO45932","CLEANSTART-2026-AT75001","CLEANSTART-2026-AV92018","CLEANSTART-2026-JM36564","CLEANSTART-2026-MO11506","CLEANSTART-2026-OP95878","CLEANSTART-2026-OV27346","CLEANSTART-2026-OY78254","CLEANSTART-2026-VQ30141","CLEANSTART-2026-WW59813","CLEANSTART-2026-WX80544","CLEANSTART-2026-XV17458","DEBIAN-CVE-2026-91776","ECHO-8ef9-d35a-7067","GHSA-wv8q-qhhj-9h54","MINI-233x-98gj-q26p","MINI-298q-2vw2-gw4r","MINI-29vj-ff44-g874","MINI-2hjq-qmm3-vh65","MINI-2mpq-4qwr-qv95","MINI-2r5g-cxwc-xr37","MINI-2rj5-464h-73v8","MINI-3564-qp4r-j679","MINI-35r5-5rq9-9hqg","MINI-3j4c-wf8x-xhmp","MINI-3r75-r43f-phh8","MINI-3v33-pc5w-9qgg","MINI-3x6p-4885-vggj","MINI-46m3-4328-v57h","MINI-48r8-xq2q-w893","MINI-49xp-jwr2-jh95","MINI-4h85-99m2-74p5","MINI-4x82-83c8-5fww","MINI-529g-6mpm-3hh7","MINI-53x8-5rc4-9xwg","MINI-596p-qmr7-8vg7","MINI-59h8-cq2j-gjhg","MINI-5q3q-x7jj-hjr7","MINI-6832-8mq3-639w","MINI-6wm6-qw8g-55rh","MINI-73f4-9553-pfwj","MINI-7f2m-gxqf-g856","MINI-7hx3-9x5c-w4cj","MINI-7vwp-vvxq-4jvw","MINI-854v-7gqv-58jr","MINI-86p6-9743-p65p","MINI-8ccm-x2g7-vqp9","MINI-8f3p-qp5x-v3m8","MINI-8h2h-6xmh-7mmp","MINI-8qm9-m7wg-8449","MINI-8vv4-fqfp-5465","MINI-9wfp-r3j7-72hc","MINI-c3qg-r646-7wfm","MINI-chpq-7h9r-mjjm","MINI-cm97-w8hg-7qhg","MINI-cwjp-q49p-vw4f","MINI-f3f9-v97w-fv75","MINI-f3wm-cfhv-crxp","MINI-f82w-7rcf-pv79","MINI-f976-66cp-63wx","MINI-fhrm-3c5q-jpjh","MINI-g7g6-99c4-p66w","MINI-g7xr-wvgh-rw63","MINI-h2p4-r9vw-54q9","MINI-h634-83x6-g5hg","MINI-hff5-p74q-pr8r","MINI-hfgc-gcrj-f582","MINI-hqcx-j6c2-gjfq","MINI-hv2f-f352-vvxx","MINI-j6jx-h3w4-m395","MINI-jf68-9cm8-3gvj","MINI-jmjv-jv2f-jqc7","MINI-m4vh-97hg-xw9q","MINI-p2jw-89wp-3j2j","MINI-pf48-hh8q-wf5h","MINI-pg55-298q-xwjg","MINI-pm6p-8qv3-3jph","MINI-q324-xffj-f285","MINI-q553-hvqf-q99g","MINI-q8pp-wpcr-xq6q","MINI-qcj5-25mw-wqxh","MINI-qhcw-3mq8-f9qf","MINI-r25c-8r49-36f6","MINI-r72f-cc2c-9jxr","MINI-rfh4-3qcc-f76x","MINI-rfv3-754j-mg6g","MINI-rp79-rh89-mm9m","MINI-rp8m-h7mp-f6x5","MINI-rpxp-87h3-fwq4","MINI-rwwm-2qm4-cjj8","MINI-vcq2-wg28-8xpm","MINI-vhqm-2jjp-jhhq","MINI-w2vx-cx48-j7mh","MINI-w44p-wprv-8673","MINI-w583-8q3g-xrp7","MINI-w7rf-9hmp-6f56","MINI-w7rp-q9x9-9cw7","MINI-wg76-f74p-mfff","MINI-x32r-7qwr-6v3x","MINI-x66f-p6q6-qr9j","MINI-x896-345x-7mqr","MINI-xc8m-2crg-rp4r","MINI-xgq3-qc26-gq3m","MINI-xjhp-gf5h-c54v","MINI-xm2m-j985-rff8","MINI-xq37-f9g6-3q52","RHLW-2026-bcaf0a0ae0978229","ROOT-APP-MAVEN-CVE-2026-91776","UBUNTU-CVE-2026-91776"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Java JSON library","requires_auth":"none","summary":"Attackers can cause memory exhaustion in jackson-databind by supplying unique unknown type IDs when name-based polymorphism with a fallback is enabled.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"HeroDevs","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"TypeDeserializerBase._findDeserializer() in FasterXML jackson-databind caches the resolved deserializer under the raw, attacker-supplied type ID. When name-based polymorphism is configured with a fallback, for example @JsonTypeInfo(use = Id.NAME, defaultImpl = ...), every distinct unrecognized type ID resolves to the same fallback deserializer but is retained as its own key in the _deserializers map. That map has no configurable bound and lives for the lifetime of the type deserializer, so an attacker who can repeatedly supply fresh unknown type IDs causes monotonic memory retention across requests. The reporter observed 10,000 retained entries from 10,000 distinct unknown IDs, against a single entry for a control that repeated one unknown ID the same number of times, isolating attacker-controlled key cardinality from request volume. Exploitation requires an application that enables name-based polymorphism with a defaultImpl or equivalent fallback, accepts attacker-influenced type IDs, and reuses a long-lived ObjectMapper across requests. The fix stops caching fallback resolutions for unrecognized IDs and bounds both the number of cached entries and the length of a cacheable type ID.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"jackson-databind: unbounded growth of the type id cache in TypeDeserializerBase retains every unknown raw type ID","id":"CVE-2026-91776","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":10,"n_references":2,"next":{"headline":"jackson-databind: quadratic forward-reference completion in Collection and Map deserializers","id":"CVE-2026-91777"},"packages":[{"ecosystem":"Maven","fixed":["2.18.11"],"introduced":["2.0.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-databind","purl":null,"source":"GHSA-wv8q-qhhj-9h54"},{"ecosystem":"Maven","fixed":["2.18.11"],"introduced":["2.0.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-databind","purl":"pkg:maven/com.fasterxml.jackson.core/jackson-databind","source":"GHSA-wv8q-qhhj-9h54"},{"ecosystem":"Maven","fixed":["2.21.7"],"introduced":["2.19.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-databind","purl":null,"source":"GHSA-wv8q-qhhj-9h54"},{"ecosystem":"Maven","fixed":["2.21.7"],"introduced":["2.19.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-databind","purl":"pkg:maven/com.fasterxml.jackson.core/jackson-databind","source":"GHSA-wv8q-qhhj-9h54"},{"ecosystem":"Maven","fixed":["2.22.3"],"introduced":["2.22.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-databind","purl":null,"source":"GHSA-wv8q-qhhj-9h54"},{"ecosystem":"Maven","fixed":["2.22.3"],"introduced":["2.22.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-databind","purl":"pkg:maven/com.fasterxml.jackson.core/jackson-databind","source":"GHSA-wv8q-qhhj-9h54"},{"ecosystem":"Maven","fixed":["3.1.7"],"introduced":["3.0.0"],"last_affected":[],"package":"tools.jackson.core:jackson-databind","purl":null,"source":"GHSA-wv8q-qhhj-9h54"},{"ecosystem":"Maven","fixed":["3.1.7"],"introduced":["3.0.0"],"last_affected":[],"package":"tools.jackson.core:jackson-databind","purl":"pkg:maven/tools.jackson.core/jackson-databind","source":"GHSA-wv8q-qhhj-9h54"},{"ecosystem":"Maven","fixed":["3.2.3"],"introduced":["3.2.0"],"last_affected":[],"package":"tools.jackson.core:jackson-databind","purl":null,"source":"GHSA-wv8q-qhhj-9h54"},{"ecosystem":"Maven","fixed":["3.2.3"],"introduced":["3.2.0"],"last_affected":[],"package":"tools.jackson.core:jackson-databind","purl":"pkg:maven/tools.jackson.core/jackson-databind","source":"GHSA-wv8q-qhhj-9h54"}],"prev":{"headline":"LimeSurvey Community Edition 7.0.14 - Reflected XSS through unescaped LSS survey-import warnings","id":"CVE-2026-91775"},"products":["jackson-databind"],"published":"2026-09-23","related":[],"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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-23","vendors":["FasterXML"]},"summary":"Attackers can cause memory exhaustion in jackson-databind by supplying unique unknown type IDs when name-based polymorphism with a fallback is enabled.","url":"https://insights.sbomify.com/CVE-2026-91776/"}