CVE-2026-58081
Description
A flaw was found in iconv. Several encoding modules, including HZ, UTF-7, VIQR, and ZW, did not properly validate the size of the provided output buffer before writing converted characters. This oversight could allow an application using iconv to convert untrusted input with one of the affected encodings to experience buffer overflows, potentially leading to denial of service or arbitrary code execution.
Statement
This vulnerability is rated as an Important impact because memory corruption during character set conversion can potentially allow arbitrary code execution or service termination when processing untrusted data. Red Hat Enterprise Linux is not affected by this issue because it utilizes the GNU C Library implementation of iconv instead of the FreeBSD iconv codebase. Consequently, the vulnerable encoding routines are not present in Red Hat environments.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.3 | N/A | 9.8 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | Required | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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