---
id: "CVE-2026-88822"
page: "https://infrastack.ai/live/CVE-2026-88822"
kind: "vulnerability"
aliases: ["CVE-2026-88822"]
title: "OpenSSL: QUIC peer detection leaks uninitialized stack memory to network observers"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "OpenSSL", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["openssl", "other", "quic", "servers"]
not_affected_if: ["fips-module", "no-quic", "unconnected-sockets"]
published_at: "2026-11-10T19:21:34+00:00"
first_seen_at: "2026-11-10T19:25:21+00:00"
updated_at: "2026-11-10T20:04:53+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88822", "first_seen_at": "2026-11-10T19:25:21+00:00"}]
exploit_sources: []
---

# OpenSSL: QUIC peer detection leaks uninitialized stack memory to network observers

Link for people: https://infrastack.ai/live/CVE-2026-88822 (this .md is for agents)

OpenSSL's QUIC stack can fill the peer address used for outgoing packets with uninitialized stack data when it auto-detects the peer on a connected socket. An attacker watching the network can read that stack data, and affected connections can break.

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

## Affected

- vendor:OpenSSL affected range not listed fixed no fixed version listed

## How to check

- Check whether the application uses OpenSSL's QUIC stack on a connected UDP socket, which is the path that runs automated peer detection during the handshake.

## Timeline

- 2026-11-10T19:25:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-88822

## Documents

- [fix] Patch: github.com https://github.com/openssl/openssl/commit/1a73dc590cbad62d6f0329ea4779eadaa8d8fd75
- [fix] Patch: github.com https://github.com/openssl/openssl/commit/7b4f5344aa0401e7b777640050b5257ed2a70e88
- [fix] Patch: github.com https://github.com/openssl/openssl/commit/911eee8eb7550b95a206f1ad8cbdb986098982f3

## From the sources

Issue summary: QUIC, when performing automated peer detection, may allow
uninitialized stack data to leak into the received address which is then used
as the destination for outgoing packets.

Impact summary: Applications using QUIC's automated peer detection mechanism
may receive an invalid address, leading to connection loss and disclosure of
uninitialized stack data to an attacker observing the outgoing network traffic.

CWE: CWE-457 (Use of Uninitialized Variable)

Description: The OpenSSL QUIC stack contains a feature in which, when using an
already connected socket, it will auto-detect the peer address during the SSL
handshake.  This feature uses the getpeername() function, passing a buffer of
sufficient length to hold any supported address family, but passes a buffer
length that is only sized such that larger addresses, such as IPv6, cannot be
retrieved. The getpeername() function however, still returns the full address
length, which is accepted as the valid input buffer length, leading to the
address buffer containing uninitialized stack data instead of the actual peer
address. The invalid peer address is then used as destination for the outgoing
packets which leads to a connectivity breakage and a leakage of the
uninitialized stack data to passive network observers.

FIPS impact: no
The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE as
the affected protocol is not implemented in the FIPS module.

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