CVE-2026-8829 | HTML::Entities versions before 3.84 for Perl read freed heap… | CVSS 7.5 HIGH

Description

HTML::Entities versions before 3.84 for Perl read freed heap memory in _decode_entities. The XS routine backing HTML::Entities::_decode_entities cached a pointer (repl) into the entity-value SV returned by hv_fetch on the entity2char hash. When the input SV was identical to a value SV in that hash, and that value contained its own key as an entity reference, a later call to grow_gap() reallocated the SV's PV buffer and freed the backing allocation that repl still pointed into. The subsequent copy loop read repl_len bytes from the freed allocation. The read may disclose adjacent heap contents into the destination SV.

Metadata

CVE ID: CVE-2026-8829
State: PUBLISHED
Assigner: CPANSec
Reserved: 2026-05-18 13:24 UTC
Published: 2026-06-04 02:03 UTC
Last updated: 2026-06-04 12:59 UTC
Primary CWE: CWE-416
CWE-416 Use After Free
Vendor / Product: OALDERS / HTML::Entities
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
OALDERS	HTML::Entities	—	0 < 3.84

Weakness (CWE)

CWE	Source	Description
CWE-416	cna	CWE-416 Use After Free

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.5	HIGH	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References (2)