CVE-2019-9023

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 9%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1. A number of heap-based buffer over-read instances are present in mbstring regular expression functions when supplied with invalid multibyte data. These occur in ext/mbstring/oniguruma/regcomp.c, ext/mbstring/oniguruma/regexec.c, ext/mbstring/oniguruma/regparse.c, ext/mbstring/oniguruma/enc/unicode.c, and ext/mbstring/oniguruma/src/utf32_be.c when a multibyte regular expression pattern contains invalid multibyte sequences.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: Track

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
Severity98% × 45%
Exploitation9% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
9%
EPSS %ILE
95%
KEV
Not listed

Published

February 22, 2019

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Aug 16, 2026
Patch available. Sources: redhat.
generic

PHP :: Sec Bug #77381 :: heap buffer overflow in multibyte match_at

https://bugs.php.net/bug.php?id=77381
generic

PHP :: Sec Bug #77371 :: heap buffer overflow in mb regex functions - compile_string_node

https://bugs.php.net/bug.php?id=77371
generic

PHP :: Sec Bug #77370 :: Buffer overflow on mb regex functions - fetch_token

https://bugs.php.net/bug.php?id=77370
redhat Patch Available
https://access.redhat.com/errata/RHSA-2019:3299
redhat Patch Available
https://access.redhat.com/errata/RHSA-2019:2519
generic

SecurityFocus

http://www.securityfocus.com/bid/107156

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp5-xsl (5.5.9+dfsg-1ubuntu4.27) @ trusty2026-05-27ubuntu
ubuntuphp5-xmlrpc (5.3.10-1ubuntu3.33) @ precise2026-05-27ubuntu
redhatphp:7.2-8020020191108065827.2c7ca8912020-04-28redhat
redhatrh-php72-php-0:7.2.24-1.el72019-11-01redhat
redhatrh-php71-php-0:7.1.30-1.el72019-08-19redhat

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

(2 across 2 ecosystems)
Debian:8(1)
PackageVulnerable rangeFixed inDependents
php55.6.11+dfsg-1 ... 5.6.9+dfsg-1 (46 versions)5.6.40+dfsg-0+deb8u1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
php7.07.0.19-1 ... 7.0.33-0+deb9u1 (18 versions)7.0.33-0+deb9u2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 4× in last 7d / 25× 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 117 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2019-9023?
CVE-2019-9023 is a critical vulnerability published on February 22, 2019. An issue was discovered in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1. A number of heap-based buffer over-read instances are present in mbstring regular expression functions when supplied with invalid multibyte data. These occur in…
When was CVE-2019-9023 disclosed?
CVE-2019-9023 was first published in the National Vulnerability Database on February 22, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-9023 actively exploited?
CVE-2019-9023 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9% probability of exploitation in the next 30 days, which ranks it in the top 5.0% of all scored CVEs.
What is the CVSS score of CVE-2019-9023?
CVE-2019-9023 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-9023?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-9023, 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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