What is CVE-2026-94127?
When a BIG-IP APM access policy and an OAuth profile are configured on a virtual server, specific malicious traffic can lead to remote code execution (RCE). This vulnerability is only present when BIG-IP APM is configured as an OAuth Authorization Server. Deployments using APM strictly as an OAuth Client / Resource Server (without OAuth authorization server profiles configured) are not affected by this vulnerability. Impact: This vulnerability allows an unauthenticated attacker to perform remote code execution. The BIG-IP system in Appliance mode is also vulnerable. This is a data plane issue; there is no control plane exposure. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
The record classifies CVE-2026-94127 under weakness class CWE-122. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 49 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v4.0 base score
- 9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - EPSS (FIRST)
- 1.3% probability of exploitation in the next 30 days, higher than 71.1% of all scored CVEs
- CISA KEV
- Listed since 2026-09-22, federal remediation deadline 2026-09-25
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2026-09-22
Is CVE-2026-94127 being exploited?
CISA added CVE-2026-94127 to the Known Exploited Vulnerabilities catalog on 2026-09-22, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-09-25 under BOD 22-01. Weaponised exploit code for CVE-2026-94127 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 75 in the Threadlinqs vulnerability feed.
- FurkanKAYAPINAR/CVE-2026-94127 (github)
Affected products and versions
- F5: BIG-IP
How to fix CVE-2026-94127
Vendor advisory: https://my.f5.com/manage/s/article/K000162605. Because CVE-2026-94127 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-09-25. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-94127
4 tracked threats in the Threadlinqs corpus reference CVE-2026-94127, either in the campaign’s CVE list or as an indicator on the campaign record.
- Eclypsium InfraTrust Pulse (Oct 2026): Actively Exploited Flaws Across Network Infrastructure Appliances (NetScaler CVE-2026-88771, Ivanti CVE-2026-104935, Check Point CVE-2026-93616, Cisco, Arista VeloCloud, FortiMail, F5 BIG-IP APM, PAN-OS, PHP2Shell, Linux Copy Fail) — CRITICAL · 2026-10-28
- Rapid7 Q3 2026 Threat Landscape: High-Severity Flaws Exploited in 3 Days as The Gentlemen and Qilin Ransomware Dominate — HIGH · 2026-10-21
- CISA Adds Four Actively Exploited KEVs: Check Point Gateway/Management RCE Flaws, Arista VeloCloud Orchestrator Auth Bypass, F5 BIG-IP APM Heap Overflow — CRITICAL · 2026-09-26
- CVE-2026-94127: Critical F5 BIG-IP APM Zero-Day Heap Overflow in OAuth Authorization Server Exploited for Unauthenticated Remote Code Execution — CRITICAL · 2026-09-23
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. This product uses the NVD API but is not endorsed or certified by the NVD.