CVE-2025-13397

Application crash via unchecked NULL reallocation pointer

Published Nov 19, 2025 · Updated Nov 19, 2025

NULL pointer dereference in mruby/c 3.0 through 3.4 allows local users to crash an embedding application through mrbc_raw_realloc. The allocator passes a NULL ptr through BLOCK_ADRS pointer arithmetic, then BLOCK_SIZE dereferences the resulting invalid address. Low-privileged local code must make the embedding program invoke this path with a NULL pointer; the bounded consequence is an immediate process crash.

CVSS severity4.8
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in mruby/c 3.0 through 3.4 allows local users to crash an embedding application through mrbc_raw_realloc. The allocator passes a NULL ptr through BLOCK_ADRS pointer arithmetic, then BLOCK_SIZE dereferences the resulting invalid address. Low-privileged local code must make the embedding program invoke this path with a NULL pointer; the bounded consequence is an immediate process crash.

The record

CVE
CVE-2025-13397
Published
Nov 19, 2025
Updated
Nov 19, 2025
Vendor
ITOC mruby/c team
Product
mruby/c
Classifications
CWE-404, CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0
  2. Affected versionversion=3.1
  3. Affected versionversion=3.2
  4. Affected versionversion=3.3
  5. Affected versionversion=3.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

ITOC mruby/c team · mruby/cversion=3.0; version=3.1; version=3.2; version=3.3; version=3.4

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.8VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
1.7VulDBAV:L/AC:L/Au:S/C:N/I:N/A:P
3.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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