{"answers":{"affected":"2 open source packages ship an affected version, including zebrad.","exploited":"There is no known exploitation of CVE-2026-52734 in the wild and no public exploit code.","fix":"Upgrade zebrad to 4.5.0 or later.","what":"CVE-2026-52734 is a medium-severity denial of service vulnerability in ZcashFoundation zebra, published on 18 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-2026-52734 and fix it if it is affected.\n\nWhat it is: CVE-2026-52734 is a medium-severity denial of service vulnerability in ZcashFoundation zebra, published on 18 Aug 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-2026-52734 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- zebrad (crates.io): affected all versions; fixed in 4.5.0\n- zebrad (crates.io): affected all versions; fixed in 4.5.0\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-2026-52734/ (Markdown: https://insights.sbomify.com/CVE-2026-52734/index.md)","id":"CVE-2026-52734","markdown":"https://insights.sbomify.com/CVE-2026-52734/index.md","name":"CVE-2026-52734","record":{"aliases":["GHSA-65jj-fmw8-468q"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Zcash node","requires_auth":"none","summary":"An unauthenticated peer can cause memory exhaustion in the Zcash node by retaining timed-out transactions, 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":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-401","name":"Missing Release of Memory after Effective Lifetime"}],"description":"ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an unauthenticated P2P peer can cause the mempool download pipeline to retain transactions after verification reaches the outer RATE_LIMIT_DELAY timeout. In zebrad/src/components/mempool/downloads.rs, Downloads::poll_next removed cancel_handles entries after success and ordinary verification errors, but tokio::time::error::Elapsed did not carry the UnminedTxId needed to remove the timed-out entry. Each retained cancel_handles entry could hold a full Gossip::Tx(UnminedTx), while normal mined-transaction cleanup could not match attacker transactions and no periodic garbage collection or count cap existed. Sustained traffic therefore caused monotonic memory growth until swap pressure degraded the node or the operating system terminated the zebrad process for exhausting memory. This issue is fixed in version 4.5.0.","ecosystems":["crates.io"],"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":"ZEBRA: Unbounded memory leak in mempool download pipeline via timeout path cancel_handles retention","id":"CVE-2026-52734","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"crates.io","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"ZEBRA: Consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser","id":"CVE-2026-52735"},"packages":[{"ecosystem":"crates.io","fixed":["4.5.0"],"introduced":["0"],"last_affected":[],"package":"zebrad","purl":null,"source":"GHSA-65jj-fmw8-468q"},{"ecosystem":"crates.io","fixed":["4.5.0"],"introduced":["0"],"last_affected":[],"package":"zebrad","purl":"pkg:cargo/zebrad","source":"GHSA-65jj-fmw8-468q"}],"prev":{"headline":"ZEBRA: Persistent on-disk corruption of Sapling/Orchard subtree roots after chain fork via pop_tip","id":"CVE-2026-52733"},"products":["zebra"],"published":"2026-08-18","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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-19","vendors":["ZcashFoundation"]},"summary":"An unauthenticated peer can cause memory exhaustion in the Zcash node by retaining timed-out transactions, leading to a denial of service.","url":"https://insights.sbomify.com/CVE-2026-52734/"}