{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" }, { "category": "details", "text": "* SECURITY UPDATE: integer overflow in compressed-token decoder allows\n memory disclosure to a malicious sender\n - debian/patches/CVE-2026-43618.patch: cap rx_token at MAX_TOKEN_INDEX\n and add overflow checks in recv_compressed_token_num/run; add\n CHUNK_SIZE bound check in simple_recv_token; initialize data=NULL\n per iteration and validate literal token pointer in receiver\n - CVE-2026-43618", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1779455173", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1779455173" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu20.04els/advisories/2026/clsa-2026_1779455173.json" } ], "tracking": { "current_release_date": "2026-05-22T13:06:44Z", "generator": { "date": "2026-05-22T13:06:44Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1779455173", "initial_release_date": "2026-05-22T13:06:44Z", "revision_history": [ { "date": "2026-05-22T13:06:44Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "Fix CVE(s): CVE-2026-43618" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 20.04", "product": { "name": "Ubuntu 20.04", "product_id": "Ubuntu-20", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" } ], "category": "vendor", "name": "Canonical Ltd." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "rsync-0:3.1.3-8ubuntu0.9+tuxcare.els1.amd64", "product": { "name": "rsync-0:3.1.3-8ubuntu0.9+tuxcare.els1.amd64", "product_id": "rsync-0:3.1.3-8ubuntu0.9+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/rsync@3.1.3-8ubuntu0.9%2Btuxcare.els1?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "rsync-0:3.1.3-8ubuntu0.9+tuxcare.els1.amd64 as a component of Ubuntu 20.04", "product_id": "Ubuntu-20:rsync-0:3.1.3-8ubuntu0.9+tuxcare.els1.amd64" }, "product_reference": "rsync-0:3.1.3-8ubuntu0.9+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-20" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-43618", "cwe": { "id": "CWE-125", "name": "Out-of-bounds Read" }, "notes": [ { "category": "description", "text": "Rsync version 3.4.2 and prior contain an integer overflow vulnerability in the compressed-token decoder where a 32-bit signed counter is not checked for overflow, allowing a malicious sender to trigger an overflow that causes the receiver process to read and return data from outside the intended buffer bounds. Attackers can exploit this vulnerability to disclose process memory contents including environment variables, passwords, heap and stack data, and library memory pointers, significantly reducing ASLR effectiveness and facilitating further exploitation.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "Ubuntu-20:rsync-0:3.1.3-8ubuntu0.9+tuxcare.els1.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-43618" }, { "category": "external", "summary": "https://github.com/RsyncProject/rsync/releases/tag/v3.4.3", "url": "https://github.com/RsyncProject/rsync/releases/tag/v3.4.3" }, { "category": "external", "summary": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-g37v-g3gj-pmwq", "url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-g37v-g3gj-pmwq" }, { "category": "external", "summary": "https://www.vulncheck.com/advisories/rsync-integer-overflow-information-disclosure", "url": "https://www.vulncheck.com/advisories/rsync-integer-overflow-information-disclosure" } ], "release_date": "2026-05-20T02:16:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-05-22T13:06:15.715259Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1779455173", "product_ids": [ "Ubuntu-20:rsync-0:3.1.3-8ubuntu0.9+tuxcare.els1.amd64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1779455173" } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1" }, "products": [ "Ubuntu-20:rsync-0:3.1.3-8ubuntu0.9+tuxcare.els1.amd64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }