CVE-2026-9516

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-03. 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 — 4 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

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws.

To skip a leading 3-byte UTF-8 BOM, decode_json() advances the input scalar's string pointer past the mark with SvPV_set() and restores it only on the normal return path. When decoding aborts through a Perl exception, for example a filter_json_object callback that croaks, the restore is skipped and the scalar is left with its string pointer offset into its own buffer and a shortened length.

When that scalar is later freed, the allocator receives an invalid pointer and the interpreter aborts. A single BOM prefixed document decoded with a throwing filter callback crashes any caller.

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
29%
KEV
Not listed

Published

June 3, 2026

Last Modified

July 22, 2026

Advisory Details (3)

Auto-updated Jun 6, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-9516: Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws

http://www.openwall.com/lists/oss-security/2026/06/03/5
generic

Changes - metacpan.org

https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.41/changes
generic
https://github.com/rurban/Cpanel-JSON-XS/commit/dfe1b41a36caba51dc12a2917fe50285d1ffaa7b.patch

Vendor Advisories for CVE-2026-9516(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libcpanel-json-xs-perl4.25-1 ... 4.42-1 (19 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libcpanel-json-xs-perl4.35-1 ... 4.42-1 (11 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libcpanel-json-xs-perl4.39-1 ... 4.42-1 (6 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libcpanel-json-xs-perl4.39-1, 4.39-2, 4.39-2~deb13u1, 4.40-14.41-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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 221 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 05:39 UTCEG score recompute
  4. 2026-09-14 05:39 UTCGHSA enrichment
  5. 2026-09-13 16:48 UTCEPSS rescore
  6. 2026-09-12 23:36 UTCOSV refresh
  7. 2026-09-12 15:02 UTCEPSS rescore
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-11 09:38 UTCEPSS rescore
  10. 2026-09-10 09:35 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 03:42 UTCEG score recompute
  25. 2026-08-25 03:42 UTCGHSA enrichment
Show 75 more
  1. 2026-08-24 14:18 UTCEPSS rescore
  2. 2026-08-23 13:36 UTCEG score recompute
  3. 2026-08-23 13:36 UTCGHSA enrichment
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-21 14:43 UTCGHSA enrichment
  7. 2026-08-20 23:16 UTCEG score recompute
  8. 2026-08-20 23:16 UTCGHSA enrichment
  9. 2026-08-20 22:56 UTCEPSS rescore
  10. 2026-08-20 10:07 UTCEG score recompute
  11. 2026-08-20 10:07 UTCGHSA enrichment
  12. 2026-08-19 17:04 UTCEPSS rescore
  13. 2026-08-18 13:49 UTCEPSS rescore
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 06:43 UTCGHSA enrichment
  16. 2026-08-16 17:05 UTCEG score recompute
  17. 2026-08-16 17:05 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 03:59 UTCEG score recompute
  20. 2026-08-16 03:59 UTCGHSA enrichment
  21. 2026-08-16 02:15 UTCEPSS rescore
  22. 2026-08-15 14:53 UTCEG score recompute
  23. 2026-08-15 14:53 UTCGHSA enrichment
  24. 2026-08-15 01:31 UTCEPSS rescore
  25. 2026-08-15 01:25 UTCGHSA enrichment
  26. 2026-08-14 12:19 UTCGHSA enrichment
  27. 2026-08-13 23:14 UTCEG score recompute
  28. 2026-08-13 23:14 UTCGHSA enrichment
  29. 2026-08-13 22:00 UTCEPSS rescore
  30. 2026-08-13 03:12 UTCGHSA enrichment
  31. 2026-08-12 14:06 UTCEG score recompute
  32. 2026-08-12 14:06 UTCGHSA enrichment
  33. 2026-08-12 13:51 UTCEPSS rescore
  34. 2026-08-12 00:59 UTCEG score recompute
  35. 2026-08-12 00:59 UTCGHSA enrichment
  36. 2026-08-11 13:43 UTCEPSS rescore
  37. 2026-08-11 11:53 UTCEG score recompute
  38. 2026-08-11 11:53 UTCGHSA enrichment
  39. 2026-08-11 00:00 UTCEPSS rescore
  40. 2026-08-10 22:47 UTCGHSA enrichment
  41. 2026-08-10 06:23 UTCGHSA enrichment
  42. 2026-08-09 17:18 UTCEG score recompute
  43. 2026-08-09 17:18 UTCGHSA enrichment
  44. 2026-08-09 13:47 UTCEPSS rescore
  45. 2026-08-09 04:12 UTCEG score recompute
  46. 2026-08-09 04:12 UTCGHSA enrichment
  47. 2026-08-08 16:37 UTCEPSS rescore
  48. 2026-08-08 15:07 UTCGHSA enrichment
  49. 2026-08-08 01:59 UTCEG score recompute
  50. 2026-08-08 01:59 UTCGHSA enrichment
  51. 2026-08-07 16:30 UTCEPSS rescore
  52. 2026-08-07 12:53 UTCGHSA enrichment
  53. 2026-08-06 23:47 UTCEG score recompute
  54. 2026-08-06 23:47 UTCGHSA enrichment
  55. 2026-08-06 13:47 UTCEPSS rescore
  56. 2026-08-06 09:40 UTCGHSA enrichment
  57. 2026-08-05 20:34 UTCEG score recompute
  58. 2026-08-05 20:34 UTCGHSA enrichment
  59. 2026-08-05 19:17 UTCEPSS rescore
  60. 2026-08-04 19:32 UTCEG score recompute
  61. 2026-08-04 19:32 UTCGHSA enrichment
  62. 2026-08-04 15:10 UTCEPSS rescore
  63. 2026-08-04 10:39 UTCEPSS rescore
  64. 2026-08-03 18:40 UTCEG score recompute
  65. 2026-08-03 18:40 UTCGHSA enrichment
  66. 2026-08-03 10:36 UTCEPSS rescore
  67. 2026-08-03 04:27 UTCGHSA enrichment
  68. 2026-08-02 15:21 UTCEG score recompute
  69. 2026-08-02 15:21 UTCGHSA enrichment
  70. 2026-08-02 02:27 UTCEPSS rescore
  71. 2026-08-02 02:15 UTCGHSA enrichment
  72. 2026-08-01 13:09 UTCEG score recompute
  73. 2026-08-01 13:09 UTCGHSA enrichment
  74. 2026-08-01 04:16 UTCEPSS rescore
  75. 2026-07-31 18:40 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-9516?
CVE-2026-9516 is a high vulnerability published on June 3, 2026. Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws. To skip a leading 3-byte UTF-8 BOM, decodejson() advances the input scalar's string pointer past the mark with SvPVset() and restores it only on the normal…
When was CVE-2026-9516 disclosed?
CVE-2026-9516 was first published in the National Vulnerability Database on June 3, 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-2026-9516 actively exploited?
CVE-2026-9516 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 70.5% of all scored CVEs.
What is the CVSS score of CVE-2026-9516?
CVE-2026-9516 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-9516?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9516, 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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