{"id":"UBUNTU-CVE-2021-32765","details":"Hiredis is a minimalistic C client library for the Redis database. In affected versions Hiredis is vulnurable to integer overflow if provided maliciously crafted or corrupted `RESP` `mult-bulk` protocol data. When parsing `multi-bulk` (array-like) replies, hiredis fails to check if `count * sizeof(redisReply*)` can be represented in `SIZE_MAX`. If it can not, and the `calloc()` call doesn't itself make this check, it would result in a short allocation and subsequent buffer overflow. Users of hiredis who are unable to update may set the [maxelements](https://github.com/redis/hiredis#reader-max-array-elements) context option to a value small enough that no overflow is possible.","modified":"2026-04-22T14:21:45.394249Z","published":"2021-10-04T21:15:00Z","upstream":["CVE-2021-32765"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-32765"},{"type":"REPORT","url":"https://wiki.sei.cmu.edu/confluence/display/c/MEM07-C.+Ensure+that+the+arguments+to+calloc%28%29%2C+when+multiplied%2C+do+not+wrap"},{"type":"REPORT","url":"https://github.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-32765"}],"affected":[{"package":{"name":"hiredis","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/hiredis@0.13.3-2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.1-2","0.13.3-1","0.13.3-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libhiredis0.13","binary_version":"0.13.3-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-32765.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}