CVE-2026-52747

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under NVD CVSS v3. EPSS exploit probability: 0.5% (38th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.6Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 3.0.16, the multipart/form-data request body parser in libmodsecurity silently removes embedded line breaks from non-file form-field values before exporting them to ARGS and ARGS_POST because src/request_body_processor/multipart.cc overwrites reserved bytes in m_reserve instead of appending the current buffer. This creates a parser differential between ModSecurity and backend applications that preserve line breaks in form fields, allowing rules that inspect ARGS or ARGS_POST to miss payloads whose dangerous syntax depends on a line break. This issue is fixed in version 3.0.16.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
70
EG Risk 70/100CISA SSVC

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
Severity86% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 10, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Jul 10, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)🟡 PoC Available

Multipart form-data parser silently strips embedded line breaks from form-field values, enabling request-body inspection bypass · Advisory · owasp-modsecurity/ModSecurity · GitHub

https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-rcw9-2f5r-7p88
github_release Patch Available

v3.0.16

Patch available: owasp-modsecurity/ModSecurity v3.0.16

https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16
github_commit

commit 875504c27581 (owasp-modsecurity/ModSecurity)

Fix landed in owasp-modsecurity/ModSecurity commit 875504c27581 — awaiting tagged release

https://github.com/owasp-modsecurity/ModSecurity/commit/875504c2758169c41be1ad2f0cc64d896b7815d7

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
modsecurity3.0.10-1 ... 3.0.9-1 (15 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
modsecurity3.0.10-1 ... 3.0.9-1+deb12u2 (12 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
modsecurity3.0.14-1, 3.0.14-1+deb13u1, 3.0.15-1, 3.0.16-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
modsecurity3.0.14-1, 3.0.15-1
  • every version up to 3.0.16-1: fixed in 3.0.16-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 31× 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 128 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-52747?
CVE-2026-52747 is a high vulnerability published on July 10, 2026. ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 3.0.16, the multipart/form-data request body parser in libmodsecurity silently removes embedded line breaks from non-file form-field values before exporting them to ARGS and…
When was CVE-2026-52747 disclosed?
CVE-2026-52747 was first published on July 10, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52747 actively exploited?
CVE-2026-52747 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52747?
CVE-2026-52747 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-52747?
A fix for CVE-2026-52747 is available: update to the fixed version the vendor names in its advisory.

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