CVE-2026-14803

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-06. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

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

Mojo::JSON versions before 9.47 for Perl allow memory exhaustion via unbounded recursion in the pure-Perl decoder.

The pure-Perl decode path (_decode_value dispatching to _decode_array and _decode_object) recurses with no depth limit, so a small deeply nested JSON document can consume excessive memory.

This path is the default when Cpanel::JSON::XS is not installed or MOJO_NO_JSON_XS=1 is set; the Cpanel::JSON::XS fast path is not affected.

Any caller that decodes an untrusted JSON body, for example Mojo::Message::json reached through $c->req->json, can exhaust process memory and cause denial of service.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 6, 2026

Last Modified

July 6, 2026

Advisory Details (3)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-14803: Mojo::JSON versions before 9.47 for Perl allow memory exhaustion via unbounded recursion in the pure-Perl decoder

http://www.openwall.com/lists/oss-security/2026/07/06/2
generic

Changes - metacpan.org

https://metacpan.org/release/SRI/Mojolicious-9.47/changes
generic
https://github.com/mojolicious/mojo/commit/cc38b0554275c4d84f6b8b49bcbbc1bec2068fe1.patch

Vendor Advisories for CVE-2026-14803(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
libmojolicious-perl8.71+dfsg-1 ... 9.48+dfsg-1 (29 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libmojolicious-perl9.31+dfsg-1 ... 9.48+dfsg-1 (18 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libmojolicious-perl9.39+dfsg-1 ... 9.48+dfsg-1 (8 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libmojolicious-perl9.39+dfsg-1 ... 9.46+dfsg-1 (6 versions)9.47+dfsg-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 58× 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 147 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-14803?
CVE-2026-14803 is a medium vulnerability published on July 6, 2026. Mojo::JSON versions before 9.47 for Perl allow memory exhaustion via unbounded recursion in the pure-Perl decoder. The pure-Perl decode path (decodevalue dispatching to decodearray and decodeobject) recurses with no depth limit, so a small deeply nested JSON document can consume excessive memory.…
When was CVE-2026-14803 disclosed?
CVE-2026-14803 was first published in the National Vulnerability Database on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-14803 actively exploited?
CVE-2026-14803 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.8% of all scored CVEs.
What is the CVSS score of CVE-2026-14803?
CVE-2026-14803 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-14803?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-14803, 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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