{"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: Heap buffer overflow in CMS AES-WRAP-PAD key unwrap\n     - debian/patches/CVE-2026-63072.patch: size the key-unwrap output buffer\n       in crypto/cms/cms_kari.c for the worst case so a failed AES-WRAP-PAD\n       unwrap cannot write 8 bytes past the allocation, with the upstream\n       regression test in test/cmsapitest.c and test/recipes/80-test_cmsapi.t\n     - CVE-2026-63072","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-2026:1790082267","url":"https://cve.tuxcare.com/els/releases/CLSA-2026:1790082267"},{"category":"self","summary":"Canonical URL","url":"https://security.tuxcare.com/csaf/v2/els_os/debian11els/advisories/2026/clsa-2026_1790082267.json"}],"title":"Fix CVE(s): CVE-2026-63072","tracking":{"current_release_date":"2026-09-22T13:05:15Z","generator":{"date":"2026-09-22T13:05:15Z","engine":{"name":"pyCSAF"}},"id":"CLSA-2026:1790082267","initial_release_date":"2026-09-22T13:05:15Z","revision_history":[{"date":"2026-09-22T13:05:15Z","number":"1","summary":"Initial version"}],"status":"final","version":"1"}},"product_tree":{"branches":[{"branches":[{"branches":[{"category":"product_name","name":"Debian 11","product":{"name":"Debian 11","product_id":"Debian-11","product_identification_helper":{"cpe":"cpe:2.3:o:debian:debian_linux:11:*:*:*:*:*:*:*"}}}],"category":"product_family","name":"Debian"}],"category":"vendor","name":"Software in the Public Interest, 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trigger a\ndeterministic 8-byte out-of-bounds heap write when the victim decrypts it\nwith CMS_decrypt(), corrupting the heap and typically resulting in a Denial\nof Service.\n\nCWE: CWE-787: Out-of-bounds Write\n\nDescription: The key-wrap OID is potentially attacker-controlled on the wire.\nCMS unwrapping allows both id-aesNNN-wrap-pad and id-aesNNN-wrap ciphers.\nAn attacker can take a legitimate message and change a single OID byte to\nselect the padded variant while leaving the message otherwise valid. Since\nthe unwrap key is derived from the recipient's private operation (ECDH key\nagreement or ML-KEM decapsulation), the RFC 5649 integrity check cannot\npass, and the decryption fails with integrity failure.\n\nThe write is a fixed-size (8-byte), fixed-value (zero) heap overflow\nimmediately past the allocation, requires no special configuration, and is\nreachable from the public CMS_decrypt() function. The consequence is\na heap corruption leading to a Denial of Service. The fix in the CMS code\nsizes the unwrap output buffer for the worst case so a failed unwrap cannot\nwrite past the allocation.\n\nFIPS impact: no\n\nAs the CMS code lives outside the FIPS module boundary, no FIPS\nmodules are affected by this CVE.","title":"Vulnerability description"}],"product_status":{"fixed":["Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els2.amd64","Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els2.arm64","Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els2.armel","Debian-11:libssl-doc-0:1.1.1w-0+deb11u8+tuxcare.els2.all","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els2.amd64","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els2.arm64","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els2.armel","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els2.amd64","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els2.arm64","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els2.armel"],"known_affected":["Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els1.amd64","Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els1.arm64","Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els1.armel","Debian-11:libssl-doc-0:1.1.1w-0+deb11u8+tuxcare.els1.all","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els1.amd64","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els1.arm64","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els1.armel","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els1.amd64","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els1.arm64","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els1.armel"]},"references":[{"category":"self","summary":"Canonical URL","url":"https://cve.tuxcare.com/els/cve/CVE-2026-63072"},{"category":"external","summary":"https://github.com/openssl/openssl/commit/2a3dac874c8057c1f0186849bf1ede1ae7b6b756","url":"https://github.com/openssl/openssl/commit/2a3dac874c8057c1f0186849bf1ede1ae7b6b756"},{"category":"external","summary":"https://github.com/openssl/openssl/commit/87784ad619af36b8807c2044b3940006fccc1e42","url":"https://github.com/openssl/openssl/commit/87784ad619af36b8807c2044b3940006fccc1e42"},{"category":"external","summary":"https://github.com/openssl/openssl/commit/9530a5fd1aacaeccdced4478ea2340a480613335","url":"https://github.com/openssl/openssl/commit/9530a5fd1aacaeccdced4478ea2340a480613335"},{"category":"external","summary":"https://github.com/openssl/openssl/commit/9ec2f6d2ae2bcad907cf7ee38584855bafe4979a","url":"https://github.com/openssl/openssl/commit/9ec2f6d2ae2bcad907cf7ee38584855bafe4979a"},{"category":"external","summary":"https://github.com/openssl/openssl/commit/a0c8ec557d9cac078f032d76cdf684fe743eb382","url":"https://github.com/openssl/openssl/commit/a0c8ec557d9cac078f032d76cdf684fe743eb382"},{"category":"external","summary":"https://openssl-library.org/news/secadv/20260825.txt","url":"https://openssl-library.org/news/secadv/20260825.txt"}],"release_date":"2026-08-25T13:19:00Z","remediations":[{"category":"vendor_fix","date":"2026-09-22T13:04:30.935534Z","details":"Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1790082267","product_ids":["Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els2.amd64","Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els2.arm64","Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els2.armel","Debian-11:libssl-doc-0:1.1.1w-0+deb11u8+tuxcare.els2.all","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els2.amd64","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els2.arm64","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els2.armel","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els2.amd64","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els2.arm64","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els2.armel"],"url":"https://cve.tuxcare.com/els/releases/CLSA-2026:1790082267"},{"category":"none_available","date":"2026-08-25T13:19:00Z","details":"Affected","product_ids":["Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els1.amd64","Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els1.arm64","Debian-11:libssl-dev-0:1.1.1w-0+deb11u8+tuxcare.els1.armel","Debian-11:libssl-doc-0:1.1.1w-0+deb11u8+tuxcare.els1.all","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els1.amd64","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els1.arm64","Debian-11:libssl1.1-0:1.1.1w-0+deb11u8+tuxcare.els1.armel","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els1.amd64","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els1.arm64","Debian-11:openssl-0:1.1.1w-0+deb11u8+tuxcare.els1.armel"]}],"threats":[{"category":"impact","details":"Important"}]}]}