---
title: "CVE-2026-115482: lsquic - Denial of Service"
description: "lsquic < 4.9.0 contains a denial of service caused by unlimited buffered header sets in HTTP/3 implementation, letting attackers exhaust memory via QPACK amplification attack, exploit requires sending crafted HTTP/3 headers."
url: https://panop.io/threat-heartbeat/CVE-2026-115482/
---

# CVE-2026-115482 lsquic - Denial of Service

lsquic < 4.9.0 contains a denial of service caused by unlimited buffered header sets in HTTP/3 implementation, letting attackers exhaust memory via QPACK amplification attack, exploit requires sending crafted HTTP/3 headers.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-115482)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-770](https://cwe.mitre.org/data/definitions/770.html)

## Vendor fix

Update to version 4.9.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-115482](https://nvd.nist.gov/vuln/detail/CVE-2026-115482)
- [https://foxio.io/blog/header-accordions-qpack-amplification-attacks-against-http-3-servers](https://foxio.io/blog/header-accordions-qpack-amplification-attacks-against-http-3-servers)
- [https://github.com/litespeedtech/lsquic/compare/v4.8.2...v4.9.0](https://github.com/litespeedtech/lsquic/compare/v4.8.2...v4.9.0)
- [https://github.com/litespeedtech/lsquic/pull/666](https://github.com/litespeedtech/lsquic/pull/666)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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