CVE-2026-8829

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-04. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

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 v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

June 4, 2026

Last Modified

July 22, 2026

Advisory Details (3)

Auto-updated Jun 9, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

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

http://www.openwall.com/lists/oss-security/2026/06/04/2
github_pr

Fix heap-use-after-free in _decode_entities (CVE-2026-8829)

Fix merged in libwww-perl/HTML-Parser PR #56 on 2026-05-19 — awaiting tagged release

https://github.com/libwww-perl/HTML-Parser/pull/56
generic
https://github.com/libwww-perl/HTML-Parser/commit/6922552b0778c90a9587a3894e248be4d3a25e1c.patch

Vendor Advisories for CVE-2026-8829(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibhtml-parser-perl (3.83-1ubuntu0.1) @ resolute2026-09-14ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libhtml-parser-perl3.75-13.75-1+deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libhtml-parser-perl3.81-13.81-1+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libhtml-parser-perl3.83-13.83-2~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libhtml-parser-perl3.83-1, 3.83-2~deb13u13.83-2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 302 total refreshes for this CVE.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 03:12 UTCEPSS rescore
  3. 2026-09-14 05:28 UTCEG score recompute
  4. 2026-09-14 05:28 UTCVendor advisory
  5. 2026-09-14 05:28 UTCGHSA enrichment
  6. 2026-09-13 16:48 UTCEPSS rescore
  7. 2026-09-12 23:36 UTCOSV refresh
  8. 2026-09-12 15:02 UTCEPSS rescore
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 09:38 UTCEPSS rescore
  11. 2026-09-08 22:01 UTCEPSS rescore
  12. 2026-09-06 13:48 UTCEPSS rescore
  13. 2026-09-05 15:31 UTCEPSS rescore
  14. 2026-09-04 05:07 UTCEPSS rescore
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-09-01 04:40 UTCEPSS rescore
  18. 2026-08-30 19:18 UTCEPSS rescore
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:42 UTCEPSS rescore
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-26 14:47 UTCEPSS rescore
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-25 03:35 UTCEG score recompute
  25. 2026-08-25 03:35 UTCVendor advisory
Show 75 more
  1. 2026-08-25 03:35 UTCGHSA enrichment
  2. 2026-08-24 14:18 UTCEPSS rescore
  3. 2026-08-23 12:44 UTCEG score recompute
  4. 2026-08-23 12:44 UTCVendor advisory
  5. 2026-08-23 12:44 UTCGHSA enrichment
  6. 2026-08-23 00:19 UTCEPSS rescore
  7. 2026-08-21 23:49 UTCEPSS rescore
  8. 2026-08-21 14:37 UTCVendor advisory
  9. 2026-08-21 14:37 UTCGHSA enrichment
  10. 2026-08-20 23:06 UTCEG score recompute
  11. 2026-08-20 23:06 UTCVendor advisory
  12. 2026-08-20 23:06 UTCGHSA enrichment
  13. 2026-08-20 22:56 UTCEPSS rescore
  14. 2026-08-20 09:59 UTCEG score recompute
  15. 2026-08-20 09:59 UTCVendor advisory
  16. 2026-08-20 09:59 UTCGHSA enrichment
  17. 2026-08-19 17:04 UTCEPSS rescore
  18. 2026-08-18 13:49 UTCEPSS rescore
  19. 2026-08-18 13:49 UTCEPSS rescore
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-17 06:42 UTCVendor advisory
  22. 2026-08-17 06:42 UTCGHSA enrichment
  23. 2026-08-16 16:22 UTCEG score recompute
  24. 2026-08-16 16:22 UTCVendor advisory
  25. 2026-08-16 16:22 UTCGHSA enrichment
  26. 2026-08-16 14:56 UTCEPSS rescore
  27. 2026-08-16 14:56 UTCEPSS rescore
  28. 2026-08-16 03:23 UTCEG score recompute
  29. 2026-08-16 03:23 UTCVendor advisory
  30. 2026-08-16 03:23 UTCGHSA enrichment
  31. 2026-08-16 02:15 UTCEPSS rescore
  32. 2026-08-15 14:36 UTCEG score recompute
  33. 2026-08-15 14:36 UTCVendor advisory
  34. 2026-08-15 14:36 UTCGHSA enrichment
  35. 2026-08-15 01:31 UTCEPSS rescore
  36. 2026-08-15 00:23 UTCVendor advisory
  37. 2026-08-15 00:23 UTCGHSA enrichment
  38. 2026-08-14 11:36 UTCVendor advisory
  39. 2026-08-14 11:36 UTCGHSA enrichment
  40. 2026-08-13 22:49 UTCEG score recompute
  41. 2026-08-13 22:49 UTCVendor advisory
  42. 2026-08-13 22:49 UTCGHSA enrichment
  43. 2026-08-13 22:00 UTCEPSS rescore
  44. 2026-08-13 02:10 UTCEG score recompute
  45. 2026-08-13 02:10 UTCVendor advisory
  46. 2026-08-13 02:10 UTCGHSA enrichment
  47. 2026-08-12 13:51 UTCEPSS rescore
  48. 2026-08-12 13:23 UTCVendor advisory
  49. 2026-08-12 13:23 UTCGHSA enrichment
  50. 2026-08-12 00:26 UTCEG score recompute
  51. 2026-08-12 00:26 UTCVendor advisory
  52. 2026-08-12 00:26 UTCGHSA enrichment
  53. 2026-08-11 13:43 UTCEPSS rescore
  54. 2026-08-11 11:28 UTCEG score recompute
  55. 2026-08-11 11:28 UTCVendor advisory
  56. 2026-08-11 11:28 UTCGHSA enrichment
  57. 2026-08-11 00:00 UTCEPSS rescore
  58. 2026-08-10 22:35 UTCVendor advisory
  59. 2026-08-10 22:35 UTCGHSA enrichment
  60. 2026-08-10 02:58 UTCVendor advisory
  61. 2026-08-10 02:58 UTCGHSA enrichment
  62. 2026-08-09 14:10 UTCEG score recompute
  63. 2026-08-09 14:10 UTCVendor advisory
  64. 2026-08-09 14:10 UTCGHSA enrichment
  65. 2026-08-09 13:47 UTCEPSS rescore
  66. 2026-08-09 01:23 UTCEG score recompute
  67. 2026-08-09 01:23 UTCVendor advisory
  68. 2026-08-09 01:23 UTCGHSA enrichment
  69. 2026-08-08 16:37 UTCEPSS rescore
  70. 2026-08-08 12:34 UTCVendor advisory
  71. 2026-08-08 12:34 UTCGHSA enrichment
  72. 2026-08-07 23:47 UTCEG score recompute
  73. 2026-08-07 23:47 UTCVendor advisory
  74. 2026-08-07 23:47 UTCGHSA enrichment
  75. 2026-08-07 16:30 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-8829?
CVE-2026-8829 is a high vulnerability published on June 4, 2026. HTML::Entities versions before 3.84 for Perl read freed heap memory in decodeentities. The XS routine backing HTML::Entities::decodeentities cached a pointer (repl) into the entity-value SV returned by hvfetch on the entity2char hash. When the input SV was identical to a value SV in that hash, and…
When was CVE-2026-8829 disclosed?
CVE-2026-8829 was first published in the National Vulnerability Database on June 4, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8829 actively exploited?
CVE-2026-8829 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.6% of all scored CVEs.
What is the CVSS score of CVE-2026-8829?
CVE-2026-8829 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-8829?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8829, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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