PatchTheCVECVE-2026-8829: HTML::Entities versions before 3.84 for Perl read freed heap memory in _decode_entities. The XS routine backi
CVE-2026-8829 is a high-severity flaw (CVSS 7.5) affecting html\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 allocati
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 65%) |
| CISA exploited list | No |
| Weakness | CWE-416 |
| Published | 2026-06-04 |
| Last modified | 2026-07-22 |
Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-8829?
html\: upgrade to 3.84. Exact commands for each OS are on this page.
Is CVE-2026-8829 being exploited?
CVE-2026-8829 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-8829 affect?
CVE-2026-8829 affects html\. Severity is high (CVSS 7.5). 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.
How urgent is CVE-2026-8829?
Priority 40/100. High severity; Remotely exploitable, no login, no user action