CVE-2026-9487
XML::Sig signature wrapping via duplicate ID enables SAML assertion tampering.
Is CVE-2026-9487 being exploited?
Not confirmed. CVE-2026-9487 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.17% probability of exploitation in the next 30 days.
How severe is CVE-2026-9487?
CVE-2026-9487 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-9487?
Yes. A fix has been recorded for CVE-2026-9487. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-9487 affect?
CVE-2026-9487 affects Perl XML::Sig versions < 0.71, Applications using XML::Sig for XML Signature verification, SAML2 Service Providers and Identity Providers using this module. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-9487?
Upgrade to XML::Sig 0.71+ and enforce unique ID resolution and strict signature validation.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Signature wrapping lets attacker substitute a signed element (e.g., SAML Assertion), enabling auth bypass, impersonation, and unauthorized access.
Immediate action required
- affected< 0.71
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.