{"answers":{"affected":"5 open source packages ship an affected version, including github.com/ethereum/go-ethereum and github.com/holiman/uint256. It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-26242 in the wild and no public exploit code.","fix":"Upgrade github.com/ethereum/go-ethereum to 1.9.18 or later.","what":"CVE-2020-26242 is a medium-severity denial of service vulnerability in go-ethereum, published on 25 Nov 2020. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-26242 and fix it if it is affected.\n\nWhat it is: CVE-2020-26242 is a medium-severity denial of service vulnerability in go-ethereum, published on 25 Nov 2020. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2020-26242 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/ethereum/go-ethereum (Go): affected from 1.9.16; fixed in 1.9.18\n- github.com/ethereum/go-ethereum (Go): affected from 1.9.16; fixed in 1.9.18\n- github.com/holiman/uint256 (Go): affected from 0.1.0; fixed in 1.1.1\n- github.com/holiman/uint256 (Go): affected from 0.1.0; fixed in 1.1.1\n- github.com/holiman/uint256 (Go): affected from 0.1.0; fixed in 1.1.1\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-2020-26242/ (Markdown: https://insights.sbomify.com/CVE-2020-26242/index.md)","id":"CVE-2020-26242","markdown":"https://insights.sbomify.com/CVE-2020-26242/index.md","name":"CVE-2020-26242","record":{"aliases":["GHSA-jm5c-rv3w-w83m","GO-2021-0103"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Ethereum client","requires_auth":"low_privilege","summary":"An attacker can cause a crash in the Geth Ethereum client during block processing, leading to a denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"go_ethereum","vendor":"ethereum"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"Go Ethereum, or \"Geth\", is the official Golang implementation of the Ethereum protocol. In Geth before version 1.9.18, there is a Denial-of-service (crash) during block processing. This is fixed in 1.9.18.","ecosystems":["Go"],"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 geth","id":"CVE-2020-26242","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2020"},"n_packages":5,"n_references":2,"next":{"headline":"Memory leak in nanopb","id":"CVE-2020-26243"},"packages":[{"ecosystem":"Go","fixed":["1.9.18"],"introduced":["1.9.16"],"last_affected":[],"package":"github.com/ethereum/go-ethereum","purl":null,"source":"GHSA-jm5c-rv3w-w83m"},{"ecosystem":"Go","fixed":["1.9.18"],"introduced":["1.9.16"],"last_affected":[],"package":"github.com/ethereum/go-ethereum","purl":"pkg:golang/github.com/ethereum/go-ethereum","source":"GHSA-jm5c-rv3w-w83m"},{"ecosystem":"Go","fixed":["1.1.1"],"introduced":["0.1.0"],"last_affected":[],"package":"github.com/holiman/uint256","purl":null,"source":"GHSA-jm5c-rv3w-w83m"},{"ecosystem":"Go","fixed":["1.1.1"],"introduced":["0.1.0"],"last_affected":[],"package":"github.com/holiman/uint256","purl":"pkg:golang/github.com/holiman/uint256","source":"GHSA-jm5c-rv3w-w83m"},{"ecosystem":"Go","fixed":["1.1.1"],"introduced":["0.1.0"],"last_affected":[],"package":"github.com/holiman/uint256","purl":"pkg:golang/github.com/holiman/uint256","source":"GO-2021-0103"}],"prev":{"headline":"Shallow copy bug in geth","id":"CVE-2020-26241"},"products":["go-ethereum"],"published":"2020-11-25","related":[{"cvss_score":8.7,"headline":"Go Ethereum affected by DoS via malicious p2p message","id":"CVE-2026-26314","kev_date_added":null,"published":"2026-02-19"},{"cvss_score":7.5,"headline":"go-ethereum vulnerable to denial of service via crafted GraphQL query","id":"CVE-2023-42319","kev_date_added":null,"published":"2023-10-18"},{"cvss_score":7.5,"headline":"Denial of service via malicious p2p message in go-ethereum","id":"CVE-2023-40591","kev_date_added":null,"published":"2023-09-06"},{"cvss_score":7.5,"headline":"Denial of service in go-ethereum","id":"CVE-2021-42219","kev_date_added":null,"published":"2022-03-16"},{"cvss_score":7.5,"headline":"Denial of Service in Go-Ethereum","id":"CVE-2022-23327","kev_date_added":null,"published":"2022-03-04"},{"cvss_score":7.5,"headline":"Denial of Service in Go-Ethereum","id":"CVE-2022-23328","kev_date_added":null,"published":"2022-03-04"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2018-20421","kev_date_added":null,"published":"2018-12-24"}],"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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["ethereum"]},"summary":"An attacker can cause a crash in the Geth Ethereum client during block processing, leading to a denial of service.","url":"https://insights.sbomify.com/CVE-2020-26242/"}