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CVE-2026-8829: HTML::Entities versions before 3.84 for Perl read freed heap memory in _decode_entities

highCVSS 7.5CVE-2026-8829

CSIRTS triage

vendor: HTML::Entitiesproduct: HTML::EntitiesMemory corruptionaffected: before 3.84
What
Versions before 3.84 for Perl read freed heap memory in _decode_entities.
Who is affected
Deployments using HTML::Entities versions before 3.84.
Urgency
Remediation is high urgency due to the high severity of the issue.
Action
Upgrade to HTML::Entities version 3.84 or later.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8829

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-8829coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for HTML

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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