CVE-2025-8846Public exploit

Assembler crash via out-of-bounds parser read

Published Aug 11, 2025 · Updated Aug 11, 2025

Stack-based buffer overflow in NASM 2.17rc0 allows local users to crash the assembler by processing a malformed assembly file. The parse_line function in asm/parser.c reads eight bytes beyond the stack object named dummy after insufficiently bounded parsing of unexpected syntax. Exploitation requires permission to invoke NASM on attacker-controlled source; the demonstrated consequence is an AddressSanitizer abort and process crash, not proven code execution.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in NASM 2.17rc0 allows local users to crash the assembler by processing a malformed assembly file. The parse_line function in asm/parser.c reads eight bytes beyond the stack object named dummy after insufficiently bounded parsing of unexpected syntax. Exploitation requires permission to invoke NASM on attacker-controlled source; the demonstrated consequence is an AddressSanitizer abort and process crash, not proven code execution.

The record

CVE
CVE-2025-8846
Published
Aug 11, 2025
Updated
Aug 11, 2025
Vendor
NASM
Product
NASM
Classifications
CWE-121, CWE-119
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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=2.17rc0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

NASM · NASMversion=2.17rc0

Published CVSS scores

4.3VulDB CNAAV:L/AC:L/Au:S/C:P/I:P/A:P
1.9UbuntuCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3VulDB CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Public exploit references

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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