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Public proof of conceptFix available

CVE-2019-19203

A public proof of concept exists; no exploitation attested.

  • Published2019-11-21
  • WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2019-11-2121:15CVE publishedNVD

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
30.x= 30no fix published
31.x= 31no fix published
Oniguruma project oniguruma
BranchAffectedFixed in
6.x≥ 6.0.0, < 6.9.46.9.4
6.9= 6.9.4no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libonigUbuntu:Pro:18.04:LTSall versions · fixed in 6.7.0-1ubuntu0.1~esm2
  • libonigUbuntu:Pro:16.04:LTSall versions · fixed in 5.9.6-1ubuntu0.1+esm3
  • libonigUbuntu:Pro:14.04:LTSall versions · fixed in 5.9.1-1ubuntu1.1+esm3
  • libonigDebian:14all versions · fixed in 6.9.4-1
  • libonigDebian:13all versions · fixed in 6.9.4-1
  • libonigDebian:12all versions · fixed in 6.9.4-1
  • libonigDebian:9all versions · fixed in 6.1.3-2+deb9u1
  • libzipRocky Linux:8all versions · fixed in 0:1.5.2-1.module+el8.4.0+414+2e7afcdd

65 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-19203 Red Hat Product Security698 products fixed · 311 known affected

    oniguruma: Heap-based buffer over-read in function gb18030_mbc_enc_len in file gb18030.c

    php53.src as a component of Red Hat Enterprise Linux 5 · oniguruma-devel as a component of Red Hat Enterprise Linux 6 · oniguruma.src as a component of Red Hat Enterprise Linux 6 · +308 more

  • RHSA-2024:0889 Red Hat Product Security31 products fixed

    Red Hat Security Advisory: oniguruma security update

  • RHSA-2024:0572 Red Hat Product Security31 products fixed

    Red Hat Security Advisory: oniguruma security update

  • RHSA-2024:0409 Red Hat Product Security31 products fixed

    Red Hat Security Advisory: oniguruma security update

  • RHSA-2020:5275 Red Hat Product Security304 products fixed

    Red Hat Security Advisory: rh-php73-php security, bug fix, and enhancement update

  • RHSA-2020:3662 Red Hat Product Security301 products fixed

    Red Hat Security Advisory: php:7.3 security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2024:0889 · 31 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  2. Vendor fix Red Hat Product Security RHSA-2020:5275 · 304 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon must be restarted for the update to take effect.
  3. No fix available, says the vendor Red Hat Product Security CVE-2019-19203 · 174 productsFix deferred
  4. No fix planned, says the vendor Red Hat Product Security CVE-2019-19203 · 31 productsOut of support scope
  5. No fix planned, says the vendor Red Hat Product Security CVE-2019-19203 · 106 productsWill not fix

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2019-11-21
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-ggp4-f63c-mcc4

Frequently asked questions

What is CVE-2019-19203?

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.

Is CVE-2019-19203 actively exploited?

Active exploitation of CVE-2019-19203 has not been confirmed. Its EPSS score was 4.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-19203?

CVE-2019-19203 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record