How severe is CVE-2026-7259?

CVE-2026-7259 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-7259 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-7259?

CVE-2026-7259 affects Php. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-7259?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-7259 have an EU (EUVD) identifier?

Yes. CVE-2026-7259 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28969.

When was CVE-2026-7259 published?

CVE-2026-7259 was published on 2026-05-10 and last updated on 2026-06-17.

CVE-2026-7259

CVE-2026-7259 is a medium-severity vulnerability in Php with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 2.1
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28969
Weakness: CWE-476
Affected product: Php
Published: 2026-05-10
Last modified: 2026-06-17

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().

Frequently asked questions

What is CVE-2026-7259?: 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().
How severe is CVE-2026-7259?: CVE-2026-7259 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-7259 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-7259?: CVE-2026-7259 affects Php. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-7259?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-7259 have an EU (EUVD) identifier?: Yes. CVE-2026-7259 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28969.
When was CVE-2026-7259 published?: CVE-2026-7259 was published on 2026-05-10 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

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Other CWE-476 (NULL Pointer Dereference) vulnerabilities

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CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

117.53.44.117 (ipv4-addr)
41.205.23.59 (ipv4-addr)
192.3.134.24 (ipv4-addr)
95.169.191.176 (ipv4-addr)
69.57.172.96 (ipv4-addr)
45.61.173.86 (ipv4-addr)
82.39.35.211 (ipv4-addr)
39.164.91.67 (ipv4-addr)