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

Quick assessment

Affected
OALDERS HTML::Entities
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HTML::Parser是libwww-perl开源的一款HTML文档解析与标记分离工具。 HTML::Parser 3.84之前版本存在安全漏洞，该漏洞源于_decode_entities的XS例程缓存指向entity2char哈希中SV的指针，当输入SV与哈希中值SV相同时，后续grow_gap调用重新分配SV的PV缓冲区并释放repl指向的内存，导致从释放内存读取数据，可能泄露相邻堆内容。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1056.001 · Keylogging

Affected Version Matrix 1

VendorProduct Version RangeStatus
OALDERS HTML::Entities < 3.84 affected
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I. Basic Information for CVE-2026-8829

Vulnerability Information
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Vulnerability Title
HTML::Entities versions before 3.84 for Perl read freed heap memory in _decode_entities
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
HTML::Parser 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HTML::Parser是libwww-perl开源的一款HTML文档解析与标记分离工具。 HTML::Parser 3.84之前版本存在安全漏洞，该漏洞源于_decode_entities的XS例程缓存指向entity2char哈希中SV的指针，当输入SV与哈希中值SV相同时，后续grow_gap调用重新分配SV的PV缓冲区并释放repl指向的内存，导致从释放内存读取数据，可能泄露相邻堆内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OALDERS HTML::Entities 0 ~ 3.84 -

II. Public POCs for CVE-2026-8829

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III. Intelligence Information for CVE-2026-8829

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Patches & Fixes for CVE-2026-8829 (2)

IV. Related Vulnerabilities

Same vendor: OALDERS
Same weakness: CWE-416

V. Comments for CVE-2026-8829

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