CVE-2025-13397: A security vulnerability has been detected in mrubyc up to 3.4

Q: How do I fix CVE-2025-13397?

mruby\/c: upgrade to newer than 3.4. Exact commands for each OS are on this page.

Q: Is CVE-2025-13397 being exploited?

CVE-2025-13397 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-13397 affect?

CVE-2025-13397 affects mruby\/c. Severity is low (CVSS 3.3). A security vulnerability has been detected in mrubyc up to 3.4. This impacts the function mrbc_raw_realloc of the file src/alloc.c. Such manipulation of the argument ptr leads to null pointer dereference. An attack has to be approached loca

Q: How urgent is CVE-2025-13397?

Priority 13/100. No elevated risk signals yet.

Routine

LOW 3.3UPGRADE

CVE-2025-13397 is a low-severity flaw (CVSS 3.3) affecting mruby\/c. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A security vulnerability has been detected in mrubyc up to 3.4. This impacts the function mrbc_raw_realloc of the file src/alloc.c. Such manipulation of the argument ptr leads to null pointer dereference. An attack has to be approached locally. The name of the patch is 009111904807b8567262036bf45297c3da8f1c87. It is advisable to implement a patch to correct this issue.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-404, CWE-476
Published	2025-11-19
Last modified	2026-10-19

Publisher (CNA): VulDB · Vendor: s-itoc

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-19 16:15 UTCPublished CVE record published
2026-10-19 13:10 UTCUpdated Record last modified

s-itoc mruby\/c UPGRADE

Affected: <= 3.4

Fixed in: newer than 3.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mrubyc || rpm -q mrubyc || mrubyc --version

2. UPGRADE to newer than 3.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mrubyc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mrubyc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-13397?

mruby\/c: upgrade to newer than 3.4. Exact commands for each OS are on this page.

Is CVE-2025-13397 being exploited?

CVE-2025-13397 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-13397 affect?

CVE-2025-13397 affects mruby\/c. Severity is low (CVSS 3.3). A security vulnerability has been detected in mrubyc up to 3.4. This impacts the function mrbc_raw_realloc of the file src/alloc.c. Such manipulation of the argument ptr leads to null pointer dereference. An attack has to be approached loca

How urgent is CVE-2025-13397?

Priority 13/100. No elevated risk signals yet.

References

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