CVE-2026-8829
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| OALDERS | HTML::Entities | 0 < 3.84 | affected |
Weaknesses
- CWE-416: CWE-416 Use After Free
ADP Enrichment
CVE Program Container
Additional References
- http://www.openwall.com/lists/oss-security/2026/06/04/2
- https://lists.debian.org/debian-lts-announce/2026/06/msg00044.html
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
- https://github.com/libwww-perl/HTML-Parser/pull/56
- https://github.com/libwww-perl/HTML-Parser/commit/6922552b0778c90a9587a3894e248be4d3a25e1c.patch
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