Secuno
ENNL
Book demo

CVE-2026-9487

Xml::sig vulnerability

9.1 CRITICALEPSS 0.28%
  1. Published3 Aug 2026

Description

XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID. _get_signed_xml() in lib/XML/Sig.pm, called from verify(), resolves the SignedInfo Reference/@URI to a node with the XPath expression "//*[@ID='$id']" and returns the first node of the resulting node set. A document in which two elements share that ID value is accepted: the digest and signature are checked against whichever element comes first in document order, and the duplicate is not detected. Such a document verifies successfully while an application that resolves the same ID independently can read the second, attacker supplied element; in a SAML2 context this places the contents of an Assertion under attacker control.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Xml::sig< 0.71

Remediation

Fixed in
Xml::sig≥ 0.71

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1089719.6
A flaw has been found in D-Link DCS-930L B1.08B4. This impacts the function mpfd_decode…
CVE-2026-864059.8
Improper verification of cryptographic signature vulnerability in Sipay Electronic…
CVE-2026-855319.8
Improper verification of cryptographic signature vulnerability in Sipay Electronic…
CVE-2026-1077229.8
fast-jwt provides fast JSON Web Token (JWT) implementation. From 6.2.0 until 6.3.0,…
CVE-2026-144978.1
IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0…
CVE-2026-7648210.0
As part of Cisco's ongoing commitment to proactive security and product quality, the…

Frequently asked

Is CVE-2026-9487 being actively exploited?

CVE-2026-9487 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.28%.

How severe is CVE-2026-9487?

CVE-2026-9487 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.28% probability of exploitation.

Which products are affected by CVE-2026-9487?

Affected products include Xml::sig.

How do I fix CVE-2026-9487?

Upgrade affected software to a fixed version, for example Xml::sig 0.71 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-9487 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.