CVE-2026-33487

goxmldsig has validateSignature Loop Variable Capture Signature Bypass

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.

Affected

russellhaering · goxmldsig

CVSS v3.1 CNA

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS

0.42% chance of exploitation in the next 30 days, 35th percentile

Published

2026-03-26

Updated

2026-09-09

Proof-of-concept exploits (1)

• advisories/GHSA-479m-364c-43vc

Security advisories

• russellhaering/goxmldsig/security/advisories/GHSA-479m-364c-43vc

References

• CVE Record
• NVD entry