🛡️ CVE-2023-49556 — yasm

🟡 CVSS 5.5 — Medium ⚠️ Exploit Public CWE-120 NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Buffer Overflow vulnerability in YASM 1.3.0.86.g9def allows a remote attacker to cause a denial of service via the expr_delete_term function in the libyasm/expr.c component.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2023-49556 is classified as CWE-120: Classic Buffer Overflow. Input is copied into a fixed-size buffer without a length check, overwriting memory past the end of it.

Affected software

CVE-2023-49556 is recorded against 1 package.

  • yasm

Timeline and source

Published on 3 January 2024 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com
github.com

CVE-2023-49556 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE CWE-120
Public Exploit ⚠️ Yes
Source NVD
Published 2024-01-03
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
yasm — —

References

Exploit, Vendor Advisory https://github.com/yasm/yasm/issues/250
Exploit, Vendor Advisory https://github.com/yasm/yasm/issues/250

Similar Threats

Exploit Protection

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CVE-2023-49556 carries CVSS 5.5 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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