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CVE

CVE-2026-9390

XML::Sig versions before 0.71 for Perl allow XPath injection in ID lookup
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CVE

CVE-2026-9390

XML::Sig versions before 0.71 for Perl allow XPath injection in ID lookup

XML::Sig versions before 0.71 for Perl allow XPath injection in ID lookup.

verify() and getsigned_xml() in lib/XML/Sig.pm build XPath expressions by concatenating the SignedInfo/Reference/@URI value read from the document being verified. The value is neither escaped nor checked against the NCName grammar that XML requires of an ID, so a URI containing a single quote closes the string literal in the generated expression and appends arbitrary XPath operators.

A crafted URI can make the lookup match elements the reference does not name, or every element in the document, so which node is selected for digest verification is decided by the injected expression rather than by the reference.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
C
H
U
-

Related Resources

No items found.

References

https://cpan.org/modules, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9390.json, https://metacpan.org/release/TIMLEGGE/XML-Sig-0.71/changes, https://nvd.nist.gov/vuln/detail/CVE-2026-9390, https://github.com/perl-net-saml2/perl-XML-Sig/commit/69ad2b421118fadd33d57f50b110b8d161e8fef5.patch, https://github.com/perl-net-saml2/perl-XML-Sig/commit/a85aad21aa767ac1c158bbfc19447683941ab376.patch, https://github.com/perl-net-saml2/perl-XML-Sig

Severity

9.1

CVSS Score
0
10

Basic Information

Base CVSS
9.1
EPSS Probability
0.00288%
EPSS Percentile
0.21212%
Introduced Version
0
Fix Available
a85aad21aa767ac1c158bbfc19447683941ab376

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