{"id":"CVE-2026-33487","aliases":["GHSA-479m-364c-43vc","GO-2026-4753"],"url":"https://o3.security/vulnerability/CVE-2026-33487","summary":"goxmldsig has validateSignature Loop Variable Capture Signature Bypass","details":"goxmlsig provides XML Digital Signatures implemented in Go. Prior to version 1.6.0, the `validateSignature` function in `validate.go` goes through the references in the `SignedInfo` block to find one that matches the signed element's ID. In Go versions before 1.22, or when `go.mod` uses an older version, there is a loop variable capture issue. The code takes the address of the loop variable `_ref` instead of its value. As a result, if more than one reference matches the ID or if the loop logic is incorrect, the `ref` pointer will always end up pointing to the last element in the `SignedInfo.References` slice after the loop. goxmlsig version 1.6.0 contains a patch.","published":"2026-03-26T17:17:51.101Z","modified":"2026-09-11T03:30:40.585076498Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/russellhaering/goxmldsig","fixedVersion":"1.6.0"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33487.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13548"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20943"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20946"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21769"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22347"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22423"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23345"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36882"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-33487"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33487.json"},{"type":"ADVISORY","url":"https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-479m-364c-43vc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33487"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451814"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-11T03:30:40.585076498Z"}}