---
id: "CVE-2026-112010"
kind: "vulnerability"
aliases: ["CVE-2026-112010"]
title: "smpeg: crafted MPEG file underflows packet size and crashes the application"
severity: "medium"
cvss: 6.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["c-cpp", "media-playback", "package", "smpeg"]
not_affected_if: ["no-untrusted-mpeg-input"]
published_at: "2026-10-18T12:17:13+00:00"
first_seen_at: "2026-10-23T21:57:15+00:00"
updated_at: "2026-10-25T03:45:04+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112010", "first_seen_at": "2026-10-23T21:57:15+00:00"}]
---

# smpeg: crafted MPEG file underflows packet size and crashes the application

smpeg, an MPEG decoding library, has an integer underflow in stream_header() in MPEGsystem.cpp where a crafted packet length wraps packet_size. A crafted MPEG file opened through SMPEG_new, SMPEG_new_rwops or SMPEG_new_data can trigger a reachable assertion or out-of-bounds copy that crashes the application.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether the application links smpeg, for example with `ldd` on the binary or by searching the project for `SMPEG_new`
- unknown whether a version is fixed, since the sources do not name one

## Fix

- unknown: the sources do not name a fixed smpeg version or a patch
- Until a fix is available, only open MPEG files from trusted sources with smpeg

## Timeline

- 2026-10-23T21:57:15+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112010

## From the sources

smpeg through 2.0.0 contains an integer underflow vulnerability in stream_header() in MPEGsystem.cpp that allows attackers to wrap packet_size by declaring an undersized packet length. Attackers can supply a crafted MPEG file opened via SMPEG_new, SMPEG_new_rwops or SMPEG_new_data to trigger a reachable assertion or out-of-bounds copy, crashing the application.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_