CVE-2026-13401 | XML::Bare versions through 0.53 for Perl will hang in an infinite loop when parsing malformed attributes

XML::Bare versions through 0.53 for Perl will hang in an infinite loop when parsing malformed attributes. 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.

Published: 2026-07-16 Last update: 2026-07-17 Assigner: 9b29abf9-4ab0-4765-b253-1875cd9b441e Source: 9b29abf9-4ab0-4765-b253-1875cd9b441e
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-13401 is rated Moderate Risk (41.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.39%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-13401

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-07-18 0.19% 0.39% +0.20%
2 2026-07-17 — 0.19% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-13401

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-13401

GitHub Security Advisory for CVE-2026-13401

GHSA-8299-xh3w-xhx5 · Severity: high — XML::Bare versions through 0.53 for Perl will hang in an infinite loop when parsing malformed...

OS Trackers for CVE-2026-13401

vendor priority summary link
debian not yet assigned CVE-2026-13401 not yet assigned priority: Debian including 1 source packages (libxml-bare-perl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. https://security-tracker.debian.org/tracker/CVE-2026-13401
suse medium — https://www.suse.com/security/cve/CVE-2026-13401/
ubuntu medium CVE-2026-13401 medium priority: Ubuntu including 1 source packages (libxml-bare-perl), 6 status rows across 6 suites (bionic, focal, jammy, noble, resolute, upstream): needs-triage 5, released 1. https://ubuntu.com/security/CVE-2026-13401

Affected software / configurations for CVE-2026-13401

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-13401

cvelogic Threat Intelligence