{"answers":{"affected":"2 open source packages ship an affected version, including zebrad.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52732 exists.","fix":"Upgrade zebrad to 4.5.0 or later.","what":"CVE-2026-52732 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-2026-52732 and fix it if it is affected.\n\nWhat it is: CVE-2026-52732 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52732 exists.\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-2026-52732/ (Markdown: https://insights.sbomify.com/CVE-2026-52732/index.md)","id":"CVE-2026-52732","markdown":"https://insights.sbomify.com/CVE-2026-52732/index.md","name":"CVE-2026-52732","record":{"aliases":["GHSA-4fc2-h7jh-287c"],"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 saturate Zebra's mempool queue, causing denial of service for transaction processing.","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-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, one unauthenticated P2P peer can monopolize all 25 MAX_INBOUND_CONCURRENCY slots in Zebra's inbound mempool download and verification pipeline. In zebrad/src/components/mempool/downloads.rs, the bounded queue was shared globally without per-peer accounting, while peer identity was not carried through Gossip and FullQueue responses were mapped to Response::Nil instead of reaching overload disconnection handling. An attacker can advertise fake transaction identifiers and remain silent so each task holds a slot until TRANSACTION_DOWNLOAD_TIMEOUT, then periodically refill the queue as slots expire. While saturated, honest peer transactions and local sendrawtransaction requests are rejected with MempoolError::FullQueue, although block validation and synchronization continue. 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":"weaponised"},"has_fix":true,"headline":"ZEBRA: Mempool transaction admission denial via single-peer inbound queue saturation","id":"CVE-2026-52732","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: Persistent on-disk corruption of Sapling/Orchard subtree roots after chain fork via pop_tip","id":"CVE-2026-52733"},"packages":[{"ecosystem":"crates.io","fixed":["4.5.0"],"introduced":["0"],"last_affected":[],"package":"zebrad","purl":null,"source":"GHSA-4fc2-h7jh-287c"},{"ecosystem":"crates.io","fixed":["4.5.0"],"introduced":["0"],"last_affected":[],"package":"zebrad","purl":"pkg:cargo/zebrad","source":"GHSA-4fc2-h7jh-287c"}],"prev":{"headline":"ZEBRA: Full node denial of service via non-ASCII LongPollId in getblocktemplate","id":"CVE-2026-52731"},"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-18","vendors":["ZcashFoundation"]},"summary":"An unauthenticated peer can saturate Zebra's mempool queue, causing denial of service for transaction processing.","url":"https://insights.sbomify.com/CVE-2026-52732/"}