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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: None knownExposed services: Not assessed

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
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.3%
EPSS %ILE
26th
KEV
Not listed

Published

May 10, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Jun 12, 2026
Patch available. Sources: github.
githubMentions a patch (unverified)

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(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuphp8.5-zip (8.5.4-0ubuntu1.1) @ resolute2026-08-23ubuntu
redhatphp-0:8.0.30-6.el9_82026-06-30redhat
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.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
php8.28.2.10-1 ... 8.2.7-1~deb12u1 (26 versions)
  • every version up to 8.2.31-1~deb12u1: fixed in 8.2.31-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
php8.48.4.11-1, 8.4.16-1, 8.4.16-1~deb13u1, 8.4.20-1
  • every version up to 8.4.21-1~deb13u1: fixed in 8.4.21-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
php8.48.4.11-1, 8.4.16-1, 8.4.16-1~deb13u1, 8.4.20-1, 8.4.21-1~deb13u1
  • every version up to 8.4.21-1: fixed in 8.4.21-1
—

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 7× in last 7d / 26× 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 203 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

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 on May 10, 2026, with the most recent update on July 24, 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 0.3% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
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?
A fix for CVE-2026-7259 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-7259 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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