---
id: "CVE-2026-129135"
page: "https://infrastack.ai/live/CVE-2026-129135"
kind: "vulnerability"
aliases: ["CVE-2026-129135"]
title: "picoquic: integer overflow in TIME_STAMP frame decoding corrupts QUIC timing"
severity: "medium"
cvss: 6.3
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "picoquic", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["c", "package", "picoquic", "quic"]
not_affected_if: ["not-using-picoquic", "time-stamp-extension-not-negotiated"]
published_at: "2026-11-13T17:17:31+00:00"
first_seen_at: "2026-11-13T17:48:02+00:00"
updated_at: "2026-11-13T17:49:02+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-129135", "first_seen_at": "2026-11-13T17:48:02+00:00"}]
exploit_sources: []
---

# picoquic: integer overflow in TIME_STAMP frame decoding corrupts QUIC timing

Link for people: https://infrastack.ai/live/CVE-2026-129135 (this .md is for agents)

picoquic, a QUIC library, has an integer overflow in its TIME_STAMP frame decoder. A remote QUIC peer can send oversized values that wrap around, corrupting stored timestamps, RTT and bandwidth estimates and degrading congestion control.

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

## Affected

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

## How to check

- Check the picoquic version in your build or lock file; versions before `2026.11.05.3e2e3d3` are affected.
- Check whether the TIME_STAMP extension is negotiated on your QUIC connections (unknown if the sources do not say how to confirm this).

## Fix

- picoquic: move to `2026.11.05.3e2e3d3` or later.

## Timeline

- 2026-11-13T17:48:02+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-129135

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/picoquic-before-2026.11.05-3e2e3d3-integer-overflow-via-time-stamp-frame-decoder
- [fix] Patch: github.com https://github.com/private-octopus/picoquic/commit/ef21278928771a1ace1c6764cf0e5300d61f7d94
- [fix] Release notes: github.com https://github.com/private-octopus/picoquic/releases/tag/v2026.11.05.3e2e3d3

## From the sources

picoquic before 2026.11.05.3e2e3d3 contains an integer overflow vulnerability in picoquic_decode_time_stamp_frame() that allows remote QUIC peers to corrupt stored timestamps by sending oversized TIME_STAMP values. Attackers on connections negotiating the TIME_STAMP extension can send large values shifted by ack_delay_exponent to wrap the result, corrupting RTT and bandwidth estimation and degrading congestion control.

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