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CVE-2026-7259Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()

Description

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().

Timeline

  1. ID reserved

    By php

  2. · 12 days later

    Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-7259, by who scored it
Scored byCVSSScoreVector
phpCNA (assigner)4.0Low2.1CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/U:Amber
NVDNVD · Analyzed4.0Low2.1CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:Amber
EPSS (exploitation in 30 days)
0.19% · top 92% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.1.

Affected products

  • PHP Group · PHP

    • affected 8.2.* – < 8.2.31
    • affected 8.3.* – < 8.3.31
    • affected 8.4.* – < 8.4.21
    • affected 8.5.* – < 8.5.6

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .