CVE-2026-9487XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID
Updated under an hour ago ()
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It affects TIMLEGGE XML::Sig and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 9.1 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-347
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- CPANSec
- NVD analysis
- Analyzed
- Record last updated
- Aug 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
TIMLEGGE XML::Sig timlegge:xml_sig (from the name) | before 0.71 | CNA record |
xml::sig_project xml::sig xml::sig_project:xml::sig | before 0.71 | NVD |
References
- https://github.com/perl-net-saml2/perl-XML-Sig/commit/4976bde5245df69b8e02c6ae061acbd4891cd7f9.patchpatch
- https://metacpan.org/release/TIMLEGGE/XML-Sig-0.71/source/Changesrelease-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.