{"answers":{"affected":"1 open source package ship an affected version, including mpp.","exploited":"There is no known exploitation of CVE-2026-82750 in the wild and no public exploit code.","fix":"Upgrade mpp to 0.16.1 or later.","what":"CVE-2026-82750 is a high-severity denial of service vulnerability in ZenHive mpp, published on 6 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-2026-82750 and fix it if it is affected.\n\nWhat it is: CVE-2026-82750 is a high-severity denial of service vulnerability in ZenHive mpp, published on 6 Sep 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-2026-82750 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- mpp (Hex): affected from 0.2.0; fixed in 0.16.1\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-2026-82750/ (Markdown: https://insights.sbomify.com/CVE-2026-82750/index.md)","id":"CVE-2026-82750","markdown":"https://insights.sbomify.com/CVE-2026-82750/index.md","name":"CVE-2026-82750","record":{"aliases":["EEF-CVE-2026-82750","GHSA-5qrp-r24c-w6jr","GHSA-q4f3-jf9f-788f"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Ethereum payment library","requires_auth":"none","summary":"An unauthenticated attacker can inflate gas costs for fee-payer sponsorship and force sponsors to pay for account delegations by exploiting unbounded authorization lists.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"EEF","cpe":[],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-1284","name":"Improper Validation of Specified Quantity in Input"}],"description":"Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer's gas cost per sponsored payment by a large multiplier and to have the sponsor pay for EIP-7702 account delegations of the client's choosing.\n\nWhen the server sponsors Tempo payments, MPP.Methods.Tempo.FeePayerPolicy.measure/3 in lib/mpp/methods/tempo/fee_payer_policy.ex bounds the gas fields, the fee budget, the validity window and the access list of the client-signed 0x76 envelope, but never reads its aa_authorization_list field. Every signed delegation in that list is charged as intrinsic gas before the payment call runs, so a client attaching delegations from throwaway authority keys makes the sponsor pay for them within the default gas_limit ceiling. At the reporter's default of seven entries the sponsored cost rises from about 46,575 gas to about 1,884,087 gas. Because each entry is applied as a persistent set-code delegation, a client can also upgrade its own accounts to delegated code at the sponsor's expense.\n\nThis issue affects mpp: from 0.2.0 before 0.16.1.","ecosystems":["Hex"],"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":"Denial of service in mpp","id":"CVE-2026-82750","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Hex","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":1,"n_references":4,"next":{"headline":"Unbounded key authorization in mpp Tempo fee-payer sponsorship inflates gas cost and sponsors access-key provisioning","id":"CVE-2026-82751"},"packages":[{"ecosystem":"Hex","fixed":["0.16.1"],"introduced":["0.2.0"],"last_affected":[],"package":"mpp","purl":"pkg:hex/mpp","source":"EEF-CVE-2026-82750"}],"prev":{"headline":"Missing authorization in ash","id":"CVE-2026-82749"},"products":["mpp"],"published":"2026-09-06","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Erlang Ecosystem Foundation","prefix":"EEF"},{"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":"2026-09-08","vendors":["ZenHive"]},"summary":"An unauthenticated attacker can inflate gas costs for fee-payer sponsorship and force sponsors to pay for account delegations by exploiting unbounded authorization lists.","url":"https://insights.sbomify.com/CVE-2026-82750/"}