{"answers":{"affected":"6 open source packages ship an affected version, including com.fasterxml.jackson.core:jackson-core and tools.jackson.core:jackson-core.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18401 exists.","fix":"Upgrade com.fasterxml.jackson.core:jackson-core to a fixed version for your release line: 2.18.6 or 2.21.1.","what":"CVE-2026-18401 is a medium-severity denial of service vulnerability in FasterXML jackson-core, published on 4 Aug 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-2026-18401 and fix it if it is affected.\n\nWhat it is: CVE-2026-18401 is a medium-severity denial of service vulnerability in FasterXML jackson-core, published on 4 Aug 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-2026-18401 exists.\n\nAffected packages and fixed versions:\n- com.fasterxml.jackson.core:jackson-core (Maven): affected from 2.15.0; fixed in 2.18.6\n- com.fasterxml.jackson.core:jackson-core (Maven): affected from 2.15.0; fixed in 2.18.6\n- com.fasterxml.jackson.core:jackson-core (Maven): affected from 2.19.0; fixed in 2.21.1\n- com.fasterxml.jackson.core:jackson-core (Maven): affected from 2.19.0; fixed in 2.21.1\n- tools.jackson.core:jackson-core (Maven): affected from 3.0.0; fixed in 3.1.0\n- tools.jackson.core:jackson-core (Maven): affected from 3.0.0; fixed in 3.1.0\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-2026-18401/ (Markdown: https://insights.sbomify.com/CVE-2026-18401/index.md)","id":"CVE-2026-18401","markdown":"https://insights.sbomify.com/CVE-2026-18401/index.md","name":"CVE-2026-18401","record":{"aliases":["CLEANSTART-2026-AU08981","CLEANSTART-2026-BR90501","CLEANSTART-2026-FD40389","CLEANSTART-2026-GT01967","CLEANSTART-2026-HK45779","CLEANSTART-2026-HQ66440","CLEANSTART-2026-LD68799","CLEANSTART-2026-XO96397","CLSA-2026-1791447404","CLSA-2026-1792428564","ECHO-a10b-dd74-a1af","GHSA-72hv-8253-57qq","MINI-2757-67vw-pg6h","MINI-29w2-mhmp-hpj7","MINI-2fgp-5jf7-q2q8","MINI-2gc2-h638-38v4","MINI-2jmm-gmx4-h26v","MINI-2mcr-h723-69vp","MINI-2wv9-pv48-vf4h","MINI-32gh-74j6-577j","MINI-32jm-324f-j4gc","MINI-3346-485j-w5c4","MINI-3cgg-g2cq-fc8j","MINI-3cw5-rg8g-hcgx","MINI-3fh8-f5hf-8m9p","MINI-3fjg-xx6w-vh78","MINI-3jhc-2q9r-3v74","MINI-3mjx-j9jg-wrhp","MINI-3mqg-3p84-xgv6","MINI-3qh2-r5r6-h224","MINI-424v-rr6f-6jcv","MINI-44g6-562m-xpvj","MINI-4653-c6xm-2433","MINI-4g2x-cgrx-v3cx","MINI-4m6j-m785-7c8v","MINI-4v4v-64qq-7cjc","MINI-5393-cwgp-93hh","MINI-554h-6vq8-mh75","MINI-57r9-j7gm-whjf","MINI-5863-c8h8-c87m","MINI-5f9r-cxgx-rv4p","MINI-5fv7-pqjr-78q8","MINI-5hgp-35vq-39jg","MINI-5mfm-hwh3-p8xh","MINI-63vc-25q8-g522","MINI-652q-3fvx-ww92","MINI-69hv-h7mg-hcph","MINI-6g48-cf8q-v7fw","MINI-6j4x-fvfr-mq6v","MINI-6r8h-gqvf-fp97","MINI-6w6f-68h5-g8ff","MINI-6wgc-m573-phpx","MINI-735h-8xm5-965v","MINI-73ch-4j97-6w4r","MINI-73hr-7cv2-q53r","MINI-73mc-22gx-prmh","MINI-774q-5q4p-j97g","MINI-7pgx-f57q-cw6g","MINI-7w9g-986g-5344","MINI-845h-ch4f-xpq3","MINI-8f9j-jc64-2c4r","MINI-8jg3-2mq8-7mrc","MINI-8pj8-gwcr-c838","MINI-8pq2-x9j8-m4x8","MINI-8r4j-76jv-27cc","MINI-8x33-hqqj-8px7","MINI-92f5-j425-7v5q","MINI-94x7-r8mx-xpj3","MINI-95xh-c3jh-xpqr","MINI-9j9p-34cv-6mmw","MINI-9jcv-pfxp-h9rq","MINI-9q8f-fww4-xff7","MINI-9rq3-x58c-78wx","MINI-9xwr-g49c-f44m","MINI-c4wc-96x6-p3j4","MINI-c5mv-2974-g6pm","MINI-c6wm-xfwc-m229","MINI-c6xg-4r68-hfm8","MINI-cf8g-r4c6-2p6f","MINI-ch93-49gp-vv7p","MINI-fg62-vxx7-9xm3","MINI-fgx6-8wpq-mg7g","MINI-fmjc-p3vq-2wq3","MINI-fpx3-hwp5-7vp8","MINI-fqh5-mgpm-2pm7","MINI-fqv2-9c9f-jq8c","MINI-g2cv-w28q-g97v","MINI-g3c2-xxm9-vp6c","MINI-g3m6-hq8c-53gg","MINI-gr9v-qr6r-c6v5","MINI-h59f-4c68-m8g8","MINI-h66r-3x8w-689p","MINI-hhcr-w73w-726f","MINI-j27v-6wcf-9g52","MINI-j6hx-jxw8-vgh9","MINI-j723-f45g-fp87","MINI-jh4p-5rfv-vj78","MINI-jjpj-vvjj-8gj9","MINI-jp87-8prr-m8fj","MINI-jpqm-4r54-m7f5","MINI-jr85-qrm4-vwg4","MINI-jrr3-2qq7-f3hq","MINI-jrww-vg32-f8x9","MINI-m6gw-hg7j-9v38","MINI-m9v8-832f-jj3w","MINI-mg7f-x7q2-r3w4","MINI-mhp9-5w37-7r39","MINI-mx32-pwx2-hrw4","MINI-p4ff-7cch-q3xr","MINI-phqc-4h5c-jvg5","MINI-pq8p-8jr7-cvc6","MINI-pr2m-8mvx-mff3","MINI-pv3x-3649-7gxc","MINI-q2r9-vf3m-87xm","MINI-q73h-c87g-xj2g","MINI-qff3-hjp6-g2p2","MINI-qx2f-f47f-5rpj","MINI-qx9h-9r6m-frr8","MINI-r54v-7fc9-m8gh","MINI-r5g3-4xcj-7hvp","MINI-rfgx-63x8-j86v","MINI-rr38-q6j3-v8pm","MINI-v4mg-m9ch-9p4f","MINI-v67c-39m3-wr54","MINI-v6r5-c59c-fmw8","MINI-v9v6-86g8-p5gj","MINI-vmmv-wrm3-cjvv","MINI-vmp4-fq8h-5mmh","MINI-vrf5-8wvv-gf6r","MINI-vrf6-fqf3-fh7r","MINI-vrh6-9vxf-j53m","MINI-vxmx-9724-4m8r","MINI-w289-p5j9-q2cv","MINI-x2cj-w3h6-9pr9","MINI-x2rj-pcxx-6m45","MINI-x3jp-4rg4-wqg5","MINI-x3wp-3j3x-8mc4","MINI-x7cq-f9vh-hp39","MINI-xhh2-83j4-pfmm","ROOT-APP-MAVEN-CVE-2026-18401","ROOT-APP-MAVEN-GHSA-72hv-8253-57qq","UBUNTU-CVE-2026-18401"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Java JSON library","requires_auth":"none","summary":"Attackers can cause denial of service in applications using the async JSON parser by submitting excessively long number tokens, leading to memory exhaustion or CPU spikes.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"HeroDevs","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"The non-blocking (asynchronous) JSON parser in jackson-core does not enforce the maxNumberLength constraint defined in StreamReadConstraints (default: 1000 characters). An attacker able to submit JSON to an application that uses the async parser API can supply a number token of arbitrary length, leading to excessive memory allocation and potential CPU exhaustion, resulting in a denial of service.\n\nThe synchronous parser enforces this limit correctly, so the constraint is applied inconsistently depending on which parsing API the application uses.\n\nRoot cause: the async parsing path in NonBlockingUtf8JsonParserBase and related classes never invokes the number length validation methods. Number parsing methods such as _finishNumberIntegralPart() accumulate digits into the TextBuffer without any length check, then call _valueComplete() to finalize the token. _valueComplete() does not call resetInt() or resetFloat(), which are the methods in ParserBase where validateIntegerLength() and validateFPLength() are performed. Because that validation step is skipped, maxNumberLength is never enforced on the async code path.\n\nImpact: an attacker sending a JSON document containing an arbitrarily long number to an application using the async parser (for example a Spring WebFlux or other reactive application) can cause unbounded allocation in the TextBuffer and an OutOfMemoryError. If the application subsequently calls getBigIntegerValue() or getDecimalValue(), the JVM may additionally be tied up in O(n^2) BigInteger parsing, causing CPU-based denial of service.\n\nNo privileges or user interaction beyond the ability to submit data for parsing are required.\n\nThis issue affects com.fasterxml.jackson.core:jackson-core from version 2.15.0 through 2.18.5 and from 2.19.0 through 2.21.0, and tools.jackson.core:jackson-core from 3.0.0 through 3.0.x.\n\nVersions prior to 2.15.0 are not affected, because StreamReadConstraints -- which defines the maxNumberLength setting -- was first introduced in jackson-core 2.15.0, so no such constraint exists to be bypassed in earlier releases. Note that GHSA-72hv-8253-57qq records the lower bound of the affected 2.x range as 2.0.0.","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-core: Number length constraint bypass in non-blocking (async) JSON parser leads to potential denial of service","id":"CVE-2026-18401","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":6,"n_references":3,"next":{"headline":"Cross-site scripting in SureDash – Community, Courses \u0026 Member Dashboard","id":"CVE-2026-18402"},"packages":[{"ecosystem":"Maven","fixed":["2.18.6"],"introduced":["2.15.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-core","purl":null,"source":"GHSA-72hv-8253-57qq"},{"ecosystem":"Maven","fixed":["2.18.6"],"introduced":["2.15.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-core","purl":"pkg:maven/com.fasterxml.jackson.core/jackson-core","source":"GHSA-72hv-8253-57qq"},{"ecosystem":"Maven","fixed":["2.21.1"],"introduced":["2.19.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-core","purl":null,"source":"GHSA-72hv-8253-57qq"},{"ecosystem":"Maven","fixed":["2.21.1"],"introduced":["2.19.0"],"last_affected":[],"package":"com.fasterxml.jackson.core:jackson-core","purl":"pkg:maven/com.fasterxml.jackson.core/jackson-core","source":"GHSA-72hv-8253-57qq"},{"ecosystem":"Maven","fixed":["3.1.0"],"introduced":["3.0.0"],"last_affected":[],"package":"tools.jackson.core:jackson-core","purl":null,"source":"GHSA-72hv-8253-57qq"},{"ecosystem":"Maven","fixed":["3.1.0"],"introduced":["3.0.0"],"last_affected":[],"package":"tools.jackson.core:jackson-core","purl":"pkg:maven/tools.jackson.core/jackson-core","source":"GHSA-72hv-8253-57qq"}],"prev":{"headline":"Cross-site scripting in Slider, Gallery, and Carousel by MetaSlider – Image Slider, Video Slider","id":"CVE-2026-18400"},"products":["jackson-core"],"published":"2026-08-04","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":"2026-08-04","vendors":["FasterXML"]},"summary":"Attackers can cause denial of service in applications using the async JSON parser by submitting excessively long number tokens, leading to memory exhaustion or CPU spikes.","url":"https://insights.sbomify.com/CVE-2026-18401/"}