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CVE-2019-13225: A NULL Pointer Dereference in match_at() in regexec.c in Oniguruma 6.9.2 allows attackers to potentially ca...

A NULL Pointer Dereference in match_at() in regexec.c in Oniguruma 6.9.2 allows attackers to potentially cause denial of service by providing a crafted regular expression. 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 analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2019-13225 is a denial-of-service issue in Oniguruma 6.9.2. A crafted regular expression can trigger a NULL pointer dereference and crash affected processing. Business risk depends on whether applications accept untrusted regular expressions through user input, jobs, or embedded scripting features.

Executive priority

Treat as a targeted availability risk rather than a confirmed breach indicator. Prioritize remediation where public or customer-controlled input can reach regex processing, especially in internet-facing services or shared processing workers.

Technical view

The issue is in match_at() in regexec.c in Oniguruma 6.9.2. Public sources describe a NULL pointer dereference caused by a crafted regular expression. The provided record has no CVSS, CWE, or precise affected-product CPEs, so exposure must be confirmed through dependency inventory.

Likely exposure

Likely exposure is systems using Oniguruma 6.9.2 directly or through packaged language/runtime components. The CVE notes Oniguruma issues often affect Ruby and optional libraries for PHP and Rust, but the supplied affected-product metadata is incomplete.

Exploitation context

The sources do not show known active exploitation, and the CVE is not listed as KEV. Exploitation impact is described as potential denial of service, not code execution. Practical risk increases when attackers can submit or influence regular expressions processed by Oniguruma.

Researcher notes

Evidence is limited: no CVSS vector, CWE, or complete affected-product list is provided. The strongest anchors are the upstream Oniguruma commit and downstream Fedora/Gentoo advisories. Avoid broad claims about Ruby, PHP, or Rust exposure without local dependency proof.

Mitigation direction

  • Inventory systems and applications for Oniguruma 6.9.2 or dependent packages.
  • Apply vendor-provided Oniguruma updates from relevant platform maintainers.
  • Review Fedora and Gentoo advisories if those distributions are in use.
  • Restrict untrusted regular expression input until affected components are updated.
  • Check upstream Oniguruma guidance before applying non-vendor dependency changes.

Validation and detection

  • Confirm package versions no longer identify Oniguruma 6.9.2 as vulnerable.
  • Map public routes, APIs, and jobs that process user-controlled regular expressions.
  • Verify deployed packages correspond to fixed vendor advisory builds where applicable.
  • Review crash logs for regex-processing failures before and after remediation.
Prepared
Confidence
medium
Sources
6

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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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
5Source 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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