Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
russellhaering goxmldsig — goxmldsig has validateSignature Loop Variable Capture Signature Bypass
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N H N 7.5 .0030 22.5 —
AFFECTED
Product Versions Fixed
goxmldsig < 1.6.0 – —
TIMELINE
Mar 20 Reserved by GitHub_M
Mar 26 Published (CNA: GitHub_M)
Aug 17 EXPLOIT PUBLISHED — CVE-2026-33487 (russellhaering goxmldsig). Public exploit reference added.
Description
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| March 20, 2026 | Reserved | Reserved by GitHub_M |
| March 26, 2026 | Published | Published (CNA: GitHub_M) |
| August 17, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-33487 (russellhaering goxmldsig). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| russellhaering | goxmldsig | — | < 1.6.0 | — |
References (12)
- https://access.redhat.com/errata/RHSA-2026:13548 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:20943 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:20946 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:21769 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:22347 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:22423 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:23345 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:36882 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/security/cve/CVE-2026-33487 [vdb-entry, x_refsource_REDHAT]
- https://bugzilla.redhat.com/show_bug.cgi?id=2451814 [issue-tracking, x_refsource_REDHAT]
- https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-479m-364c-43vc [x_refsource_CONFIRM]
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33487.json [x_sadp-csaf-vex]
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-33487 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.