ubuntu-cve-2026-7259
Vulnerability from osv_ubuntu
Published
2026-05-10 05:16
Modified
2026-05-28 15:34
Summary
Details
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().
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
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"8.1.2-1ubuntu2.8",
"8.1.2-1ubuntu2.9",
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"8.1.2-1ubuntu2.11",
"8.1.2-1ubuntu2.13",
"8.1.2-1ubuntu2.14",
"8.1.2-1ubuntu2.15",
"8.1.2-1ubuntu2.17",
"8.1.2-1ubuntu2.18",
"8.1.2-1ubuntu2.19",
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{
"ecosystem_specific": {
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{
"binary_name": "php8.3-mysql",
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{
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},
{
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{
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{
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{
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{
"binary_name": "php8.4-mysql",
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{
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{
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{
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],
"versions": [
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"8.4.8-1ubuntu1",
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]
},
{
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{
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{
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{
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"binary_version": "8.5.4-0ubuntu1.1"
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"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "php8.5",
"purl": "pkg:deb/ubuntu/php8.5@8.5.4-0ubuntu1.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.4-0ubuntu1.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.5.2-0ubuntu1",
"8.5.4-0ubuntu1"
]
}
],
"aliases": [],
"details": "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\u00a0\u00a0a 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\u00a0mb_regex_encoding().",
"id": "UBUNTU-CVE-2026-7259",
"modified": "2026-05-28T15:34:43Z",
"published": "2026-05-10T05:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-7259"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-7259"
},
{
"type": "REPORT",
"url": "https://github.com/php/php-src/security/advisories/GHSA-wm6j-2649-pv75"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8336-1"
}
],
"related": [
"USN-8336-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS: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",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-7259"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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