Skip to content
Noroxi
NVD / CVE Program· CNA mitre

CVE-2019-19203: An issue was discovered in Oniguruma 6.x before 6.9.4_rc2.

Noroxi assessment

Priority: Monitor (action score 31/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 4% (FIRST EPSS); higher than 90.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: apcu-panel (AlmaLinux:8) 5.1.17-1.module_el8.3.0+2009+b272fdef; libzip (AlmaLinux:8) 1.5.2-1.module_el8.5.0+152+112d3b8c, 1.5.2-1.module_el8.3.0+2009+b272fdef, 1.5.2-1.module_el8.4.0+2229+b272fdef; libzip-devel (AlmaLinux:8) 1.5.2-1.module_el8.3.0+2009+b272fdef, 1.5.2-1.module_el8.4.0+2229+b272fdef, 1.5.2-1.module_el8.5.0+152+112d3b8c.

Low priority for now. Upgrade to apcu-panel (AlmaLinux:8) 5.1.17-1.module_el8.3.0+2009+b272fdef; libzip (AlmaLinux:8) 1.5.2-1.module_el8.5.0+152+112d3b8c, 1.5.2-1.module_el8.3.0+2009+b272fdef, 1.5.2-1.module_el8.4.0+2229+b272fdef; libzip-devel (AlmaLinux:8) 1.5.2-1.module_el8.3.0+2009+b272fdef, 1.5.2-1.module_el8.4.0+2229+b272fdef, 1.5.2-1.module_el8.5.0+152+112d3b8c or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.

HighCVSS 7.5 · v3.1—Proof of concept Fix available
Published
Nov 21, 2019
Updated
Jun 16, 2026
EPSS
4.0% · 90th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 4.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2019-19203

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for oniguruma project records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
oniguruma projectoniguruma
fedoraprojectfedora

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fedoraproject fedora30
  • fedoraproject fedora31
  • oniguruma project oniguruma6.0.0 and later · before 6.9.4
  • oniguruma project oniguruma6.9.4

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8apcu-panelbefore 5.1.17-1.module_el8.3.0+2009+b272fdef5.1.17-1.module_el8.3.0+2009+b272fdef
AlmaLinux:8libzipbefore 1.5.2-1.module_el8.5.0+152+112d3b8c1.5.2-1.module_el8.5.0+152+112d3b8c
AlmaLinux:8libzipbefore 1.5.2-1.module_el8.3.0+2009+b272fdef1.5.2-1.module_el8.3.0+2009+b272fdef
AlmaLinux:8libzipbefore 1.5.2-1.module_el8.4.0+2229+b272fdef1.5.2-1.module_el8.4.0+2229+b272fdef
AlmaLinux:8libzip-develbefore 1.5.2-1.module_el8.3.0+2009+b272fdef1.5.2-1.module_el8.3.0+2009+b272fdef
AlmaLinux:8libzip-develbefore 1.5.2-1.module_el8.4.0+2229+b272fdef1.5.2-1.module_el8.4.0+2229+b272fdef
AlmaLinux:8libzip-develbefore 1.5.2-1.module_el8.5.0+152+112d3b8c1.5.2-1.module_el8.5.0+152+112d3b8c
AlmaLinux:8libzip-toolsbefore 1.5.2-1.module_el8.4.0+2229+b272fdef1.5.2-1.module_el8.4.0+2229+b272fdef
AlmaLinux:8libzip-toolsbefore 1.5.2-1.module_el8.3.0+2009+b272fdef1.5.2-1.module_el8.3.0+2009+b272fdef
AlmaLinux:8libzip-toolsbefore 1.5.2-1.module_el8.5.0+152+112d3b8c1.5.2-1.module_el8.5.0+152+112d3b8c
AlmaLinux:8onigurumabefore 6.8.2-2.1.el8_96.8.2-2.1.el8_9
AlmaLinux:8oniguruma-develbefore 6.8.2-2.1.el8_96.8.2-2.1.el8_9
AlmaLinux:8phpbefore 7.3.20-1.module_el8.5.0+152+112d3b8c7.3.20-1.module_el8.5.0+152+112d3b8c
AlmaLinux:8phpbefore 7.3.20-1.module_el8.3.0+2009+b272fdef7.3.20-1.module_el8.3.0+2009+b272fdef
AlmaLinux:8phpbefore 7.3.20-1.module_el8.4.0+2229+b272fdef7.3.20-1.module_el8.4.0+2229+b272fdef
AlmaLinux:8php-bcmathbefore 7.3.20-1.module_el8.5.0+152+112d3b8c7.3.20-1.module_el8.5.0+152+112d3b8c
AlmaLinux:8php-bcmathbefore 7.3.20-1.module_el8.3.0+2009+b272fdef7.3.20-1.module_el8.3.0+2009+b272fdef
AlmaLinux:8php-bcmathbefore 7.3.20-1.module_el8.4.0+2229+b272fdef7.3.20-1.module_el8.4.0+2229+b272fdef
AlmaLinux:8php-clibefore 7.3.20-1.module_el8.3.0+2009+b272fdef7.3.20-1.module_el8.3.0+2009+b272fdef
AlmaLinux:8php-clibefore 7.3.20-1.module_el8.5.0+152+112d3b8c7.3.20-1.module_el8.5.0+152+112d3b8c
AlmaLinux:8php-clibefore 7.3.20-1.module_el8.4.0+2229+b272fdef7.3.20-1.module_el8.4.0+2229+b272fdef
AlmaLinux:8php-commonbefore 7.3.20-1.module_el8.5.0+152+112d3b8c7.3.20-1.module_el8.5.0+152+112d3b8c
AlmaLinux:8php-commonbefore 7.3.20-1.module_el8.3.0+2009+b272fdef7.3.20-1.module_el8.3.0+2009+b272fdef
AlmaLinux:8php-commonbefore 7.3.20-1.module_el8.4.0+2229+b272fdef7.3.20-1.module_el8.4.0+2229+b272fdef

+96

Same product

oniguruma project: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-19012An integer overflow in the search_in_range function in regexec.c in Oniguruma 6.x before 6.9.4_rc2 leads to an out-of-bounds read, in which
    42Plan
  • CVE-2019-13224A use-after-free in onig_new_deluxe() in regext.c in Oniguruma 6.9.2 allows attackers to potentially cause information disclosure, denial of
    40Plan
  • CVE-2019-19204An issue was discovered in Oniguruma 6.x before 6.9.4_rc2.
    32Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2019-13225Jul 10, 2019 · A NULL Pointer Dereference in match_at() in regexec.c in Oniguruma 6.9.2 allows attackers to potentially cause denial of service by providin
    27Monitor
  • ← EarlierCVE-2019-16163Sep 9, 2019 · Oniguruma before 6.9.3 allows Stack Exhaustion in regcomp.c because of recursion in regparse.c.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:apcu-panel5.1.17-1.module_el8.3.0+2009+b272fdef · AlmaLinux:8Package registry (OSV)
almalinux:libzip1.5.2-1.module_el8.5.0+152+112d3b8c · AlmaLinux:8Package registry (OSV)
almalinux:libzip-devel1.5.2-1.module_el8.4.0+2229+b272fdef · AlmaLinux:8Package registry (OSV)
almalinux:libzip-tools1.5.2-1.module_el8.5.0+152+112d3b8c · AlmaLinux:8Package registry (OSV)
almalinux:php7.3.20-1.module_el8.4.0+2229+b272fdef · AlmaLinux:8Package registry (OSV)
almalinux:php-bcmath7.3.20-1.module_el8.4.0+2229+b272fdef · AlmaLinux:8Package registry (OSV)
almalinux:php-cli7.3.20-1.module_el8.5.0+152+112d3b8c · AlmaLinux:8Package registry (OSV)
almalinux:php-common7.3.20-1.module_el8.3.0+2009+b272fdef · AlmaLinux:8Package registry (OSV)
almalinux:php-dba7.3.20-1.module_el8.5.0+152+112d3b8c · AlmaLinux:8Package registry (OSV)
almalinux:php-dbg7.3.20-1.module_el8.3.0+2009+b272fdef · AlmaLinux:8Package registry (OSV)
almalinux:php-devel7.3.20-1.module_el8.4.0+2229+b272fdef · AlmaLinux:8Package registry (OSV)
almalinux:php-embedded7.3.20-1.module_el8.3.0+2009+b272fdef · AlmaLinux:8Package registry (OSV)
debian:libonig6.9.4-1 · Debian:12Package registry (OSV)
opensuse:oniguruma6.7.0-150000.3.3.1 · openSUSE:Leap Micro 5.2Package registry (OSV)
red hat:apcu-panel0:5.1.17-1.module+el8.1.0+3189+a1bff096 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libzip0:1.5.2-1.module+el8.1.0+3189+a1bff096 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libzip-debuginfo0:1.5.2-1.module+el8.1.0+3189+a1bff096 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libzip-debugsource0:1.5.2-1.module+el8.1.0+3189+a1bff096 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libzip-devel0:1.5.2-1.module+el8.1.0+3189+a1bff096 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libzip-tools0:1.5.2-1.module+el8.1.0+3189+a1bff096 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libzip-tools-debuginfo0:1.5.2-1.module+el8.1.0+3189+a1bff096 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:php0:7.3.20-1.module+el8.2.0+7373+b272fdef · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:php-bcmath0:7.3.20-1.module+el8.2.0+7373+b272fdef · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:php-bcmath-debuginfo0:7.3.20-1.module+el8.2.0+7373+b272fdef · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:php-cli0:7.3.20-1.module+el8.2.0+7373+b272fdef · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:php-cli-debuginfo0:7.3.20-1.module+el8.2.0+7373+b272fdef · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:libzip0:1.5.2-1.module+el8.4.0+414+2e7afcdd · Rocky Linux:8Package registry (OSV)
rocky linux:php0:7.3.20-1.module+el8.4.0+414+2e7afcdd · Rocky Linux:8Package registry (OSV)
rocky linux:php-pear1:1.10.9-1.module+el8.4.0+414+2e7afcdd · Rocky Linux:8Package registry (OSV)
rocky linux:php-pecl-apcu0:5.1.17-1.module+el8.4.0+414+2e7afcdd · Rocky Linux:8Package registry (OSV)

+4

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:32019-11-21
Proof-of-concept repository on GitHubstars:02019-12-24

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-1 d
  2. Published
  3. TodayOct 26, 2026+2531 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records