CVE-2026-117499

@fastify/session vulnerable to session revocation bypass via a logout race condition

CVSS score

3.7

EPSS probability

—

Risk score

0.4

Published

1 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

DayBreach AI Explanation

Verified against sources

@fastify/session Session Revocation Bypass Vulnerability

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

@fastify/session contains a vulnerability that allows bypassing session revocation due to a logout race condition (S0).

Why does it matter?

An attacker holding a valid session cookie can replay it across a logout to recreate the session and maintain unauthorized access (S0).

What should be done?

Upgrade @fastify/session to version 11.1.6 or later (S0).
Implement the new conditional write in custom session stores (S0).

Chain of evidence and sources2 verified claims

@fastify/session paketindeki 11.1.6 öncesi sürümler, çıkış yarış durumu nedeniyle oturum iptalinin atlatılmasına açıktır (S0).

S0 · daybreach-canonical

Sorun, sürüm 11.1.6 ile oturum başına nesil işareti ve koşullu depolama yazımı eklenerek çözülmüştür (S0).

S0 · daybreach-canonical

Show the technical text from the sources

@fastify/session is a session plugin for Fastify. In all releases before 11.1.6, with the default rolling session behavior, a request that restored a session before a logout could save its own copy after another request had completed the session destroy call, recreating the destroyed session identifier with its authenticated data. An attacker who already holds a victim's valid signed session cookie and keeps a request in flight across the logout can replay that cookie to restore the session after it was meant to be revoked, without any cookie theft or signature forgery. The issue is fixed in @fastify/session 11.1.6, which adds a per session generation marker and a conditional store write so a session restored before a logout or regeneration cannot recreate or overwrite the current entry, and users should upgrade to 11.1.6 or later. There is no workaround, and custom session stores must implement the new conditional write.

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

CWE: CWE-362, CWE-613

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-117499 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	@fastify/session	@fastify/session	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
3.7	CVSS V31	LOW	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N	NVD
3.7	CVSS V3_1	LOW	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-117499 is associated with the following CWEs:

CWE-362: Common Weakness Enumeration Entry CWE-362 CWE-613: Common Weakness Enumeration Entry CWE-613

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-117499 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsLow

UserGerekiyor

Official Sources and Advisories

https://github.com/fastify/session/security/advisories/GHSA-2hw7-jxfh-4rm3vendor-advisory https://cna.openjsf.org/security-advisories.htmlvendor-advisory

CVSS Vector Radar Chart

3.7 / 10

Vulnerability Scoring Details

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

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow privileges

User Interaction—

Confidentiality (Gizlilik)High

Integrity (Bütünlük)Low

Availability (Erişilebilirlik)None

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

@fastify/session

Weakness Type (CWE & CAPEC)

CWE-362 CWE-613

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