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PatchSiren cyber security CVE debrief

CVE-2026-13401 CODECHILD CVE debrief

CVE-2026-13401 is a vulnerability in XML::Bare versions through 0.53 for Perl. The parserc_parse function never advances the attribute-parse state cursor on certain malformed attribute forms, looping forever. Nameless attributes such as '<a ='c'>' or unbalanced quotes '<a b='''''''c'>' can trigger this condition. This vulnerability can cause an infinite loop, potentially leading to a denial of service. Users should review their product deployments and assess potential exposure.

Vendor
CODECHILD
Product
XML::Bare
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-16
Original CVE updated
2026-07-17
Advisory published
2026-07-16
Advisory updated
2026-07-17

Who should care

Users of XML::Bare versions through 0.53 for Perl should be aware of this vulnerability and take steps to mitigate it. This includes reviewing product deployments, assessing potential exposure, and implementing compensating controls. Operators, platform administrators, vulnerability management teams, and security teams should prioritize this vulnerability.

Technical summary

The vulnerability is caused by the parserc_parse function not advancing the attribute-parse state cursor on certain malformed attribute forms, resulting in an infinite loop. This can be triggered by nameless attributes or unbalanced quotes. The affected product is XML::Bare versions through 0.53 for Perl. Defenders should focus on updating to a non-vulnerable version and implementing input validation and sanitization for XML data.

Defensive priority

High

Recommended defensive actions

  • Update XML::Bare to a version that is not vulnerable
  • Implement input validation and sanitization for XML data
  • Monitor for and respond to potential exploitation attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-16T17:16:55.320Z and has not been modified since then. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD details. Defenders should verify product deployments and review official advisories.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-13401 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-13401

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-13401 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-13401

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://github.com/nanoscopic/perl-XML-Bare/pull/2

    9b29abf9-4ab0-4765-b253-1875cd9b441e

  • Source reference

    Unverified legacy reference

    URL: https://security.metacpan.org/patches/X/XML-Bare/0.53/CVE-2026-13401-r1.patch

    9b29abf9-4ab0-4765-b253-1875cd9b441e

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.