Process hang via stalled attribute parser
Published Jul 16, 2026 · Updated Jul 16, 2026
Denial of service in CODECHILD XML::Bare 0.53 and earlier allows attackers to hang a Perl process via malformed XML attributes. The att_nameqsdone state in parserc_parse loops back to itself without advancing cpos when a single-quoted attribute name is followed by a character other than an equals sign or NUL. Processing attacker-controlled XML through the default parser pins one CPU and holds the Perl interpreter indefinitely.
Summary
What happened
Denial of service in CODECHILD XML::Bare 0.53 and earlier allows attackers to hang a Perl process via malformed XML attributes. The att_nameqsdone state in parserc_parse loops back to itself without advancing cpos when a single-quoted attribute name is followed by a character other than an equals sign or NUL. Processing attacker-controlled XML through the default parser pins one CPU and holds the Perl interpreter indefinitely.
The record
- CVE
- CVE-2026-13401
- Published
- Jul 16, 2026
- Updated
- Jul 16, 2026
- Vendor
- CODECHILD
- Product
- XML::Bare
- Classifications
- CWE-835, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 16, 2026CVE publishedPublication date reported by the CVE source.
- Jul 16, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <=0.53
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Malformed XML attribute trigger examplesproof of concept · unverified
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Technologies
Your stack
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Your stack
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