{"id":"CVE-2026-22858","summary":"FreeRDP has a global-buffer-overflow in crypto_base64_decode","details":"FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c \u003c= 0 can be optimized into a simple c != 0 check. As a result, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range restriction and be used as an index into a global lookup table, causing out-of-bounds access. This vulnerability is fixed in 3.20.1.","aliases":["GHSA-qmqf-m84q-x896"],"modified":"2026-08-20T03:31:01.293369197Z","published":"2026-01-14T17:56:29.729Z","related":["ALSA-2026:3067","ALSA-2026:3068","ALSA-2026:3334","SUSE-SU-2026:0345-1","openSUSE-SU-2026:10059-1","openSUSE-SU-2026:20339-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22858.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-125","CWE-758"]},"references":[{"type":"WEB","url":"https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22858.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19033"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3067"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3068"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3334"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3975"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4121"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4433"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4437"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4438"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4439"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4440"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4446"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4471"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4489"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-22858"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22858.json"},{"type":"ADVISORY","url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qmqf-m84q-x896"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-22858"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2429649"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freerdp/freerdp","events":[{"introduced":"0"},{"fixed":"7418bc7b7c880a87edade60282f6aeeacd640e47"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.20.1"}],"source":["AFFECTED_FIELD","CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*"}}],"versions":["3.5.1","3.5.0","3.4.0","3.3.0","3.2.0","3.1.0","3.0.0","3.0.0-rc0","3.0.0-beta4","3.0.0-beta3","3.0.0-beta2","3.0.0-beta1","2.0.0","2.0.0-rc4","2.0.0-rc3","2.0.0-rc2","2.0.0-rc1","2.0.0-rc0","2.0.0-beta1+android11","2.0.0-beta1+android10","1.2.0-beta1+android9","1.2.0-beta1+android7","1.1.0-beta+2013071101","1.1.0-beta1+ios4","1.1.0-beta1+android5","1.1.0-beta1+android4","1.1.0-beta1+ios3","1.1.0-beta1+ios2","1.1.0-beta1+android3","1.1.0-beta1+android2","1.1.0-beta1+ios1","1.1.0-beta1","1.0.1","1.0.0","1.0-beta5","1.0-beta4","1.0-beta2","1.0-beta1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-22858.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P"}]}