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CVE-2019-13224: A use-after-free in onig_new_deluxe() in regext.c in Oniguruma 6.9.2 allows attackers to potentially cause...

A use-after-free in onig_new_deluxe() in regext.c in Oniguruma 6.9.2 allows attackers to potentially cause information disclosure, denial of service, or possibly code execution by providing a crafted regular expression. The attacker provides a pair of a regex pattern and a string, with a multi-byte encoding that gets handled by onig_new_deluxe(). Oniguruma issues often affect Ruby, as well as common optional libraries for PHP and Rust.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2019-13224 is a memory safety flaw in Oniguruma 6.9.2. A crafted regular expression and input string using multi-byte encoding could crash software, expose information, or possibly enable code execution. Risk depends on whether applications let untrusted users supply regex patterns processed by Oniguruma.

Executive priority

Treat as high priority for platforms exposing regex processing to users, because the stated impact includes denial of service, information disclosure, and possible code execution. For systems without untrusted regex input, prioritize normal patch management after confirming package exposure.

Technical view

The issue is a use-after-free in onig_new_deluxe() in regext.c. Sources describe attacker control over a regex pattern and string with multi-byte encoding. Oniguruma is a regex engine used directly and through downstream packages, with advisories from Debian, Fedora, Ubuntu, Gentoo, and F5.

Likely exposure

Exposure is most likely in systems running vulnerable Oniguruma/libonig packages or products bundling them, especially where users can submit regex patterns or text processed with multi-byte encodings. Sources note possible downstream impact to Ruby and optional libraries for PHP and Rust, but exact affected products are not enumerated.

Exploitation context

The source bundle does not cite active exploitation, and CISA KEV status is false. Public descriptions indicate exploitation would require crafted regex-related input reaching the vulnerable Oniguruma code path. No exploit reliability, weaponization, or in-the-wild activity is evidenced here.

Researcher notes

Evidence supports a use-after-free in Oniguruma 6.9.2 fixed upstream and addressed by multiple Linux vendors. The bundle lacks CVSS, CWE, confirmed exploit status, and complete downstream product mapping. Validate by package lineage, bundled library versions, and reachable use of onig_new_deluxe().

Mitigation direction

  • Upgrade Oniguruma/libonig packages using vendor advisories for your distribution or product.
  • Prioritize internet-facing services that accept user-supplied regular expressions.
  • Check F5 guidance if affected F5 products are in scope.
  • Limit untrusted regex pattern submission where upgrade timing is constrained.
  • Track vendor-specific package versions rather than assuming all downstream runtimes are affected.

Validation and detection

  • Inventory systems and containers for Oniguruma or libonig 6.9.2-era packages.
  • Review application paths that accept user-provided regex patterns or multi-byte encoded text.
  • Confirm installed packages match fixed Debian, Fedora, Ubuntu, Gentoo, or vendor releases.
  • Check vendor advisories for bundled product exposure and remediation status.
  • Document compensating controls if vulnerable packages cannot be immediately updated.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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CVE-2019-13224 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
9Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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