CVE-2026-8829
The read may disclose adjacent heap contents into the destination SV.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.41%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.41% probability · 34th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- oalders/html\
- Source
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
References
- https://github.com/libwww-perl/HTML-Parser/commit/6922552b0778c90a9587a3894e248be4d3a25e1c.patchPatch
- https://github.com/libwww-perl/HTML-Parser/pull/56Issue Tracking, Patch
- http://www.openwall.com/lists/oss-security/2026/06/04/2Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2026/06/msg00044.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.