CVE-2026-7259

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% of all CVEs by exploit prediction. 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
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

A fix is available — apply it.

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to  a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to mb_regex_encoding().

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
10.2%
KEV
Not listed

Published

May 10, 2026

Last Modified

May 12, 2026

Advisory Details (1)

Auto-updated Jun 12, 2026
Patch available. Sources: github.
github Patch Available

Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init() · Advisory · php/php-src · GitHub

https://github.com/php/php-src/security/advisories/GHSA-wm6j-2649-pv75

Vendor Advisories for CVE-2026-7259(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp8.3-zip (8.3.6-0ubuntu0.24.04.9) @ noble2026-06-28ubuntu
redhatphp-0:8.3.31-1.el10_22026-06-04redhat

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.

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 / 64× 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.

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

Frequently asked(5)

What is CVE-2026-7259?
CVE-2026-7259 is a medium vulnerability published on May 10, 2026. In PHP versions 8.2. before 8.2.31, 8.3. before 8.3.31, 8.4. before 8.4.21, and 8.5. before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when…
When was CVE-2026-7259 disclosed?
CVE-2026-7259 was first published in the National Vulnerability Database on May 10, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7259 actively exploited?
CVE-2026-7259 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-7259?
CVE-2026-7259 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-7259?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7259, 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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