CVE-2015-8659

What it is

The idle stream handling in nghttp2 before 1.6.0 allows attackers to have unspecified impact via unknown vectors, aka a heap-use-after-free bug.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

4.0% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2016-01-12 19:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:34 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 4.0% in the next 30 days (EPSS).
• Severity: 10.0 CRITICAL (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2016-01-12 19:59 UTC

Last modified

2026-06-17 00:34 UTC

Exploit probability

4.0% · EPSS, next 30 days

Weakness

CWE-119 · Buffer errors

Record status

Modified

Affected

• Apple Mac Os X ≤ 10.11.3
• nghttp2 ≤ 1.5.0
• Apple Iphone Os ≤ 9.2.1
• Apple Tvos ≤ 9.1
• Apple Watchos ≤ 2.1

Attack profile CVSS 3.0 · 10.0

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

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