CVE-2026-76989

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.42% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 34.6% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-08-25.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-20 13:00Z15 DAYS AGO

Last updated

2026-08-25 14:38Z10 DAYS AGO

Reserved

2026-08-20

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

4f5caa9d0a87c251877bd37f03a01c973fbfe24bc39de6ce2250953e579e6957

• vuldb.comVDB-393612 | liftoff-sr CIPster TCP Encapsulation Receive Path encap.cc out-of-boundshttps://vuldb.com/vuln/393612vdb-entry
• vuldb.comVDB-393612 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/393612/ctisignaturepermissions-required
• vuldb.comCVE-2026-76989 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-76989third-party-advisory
• vuldb.comSubmit #880112 | liftoff-sr CIPster master before e8e9dba (reproduced on 1802525be27d33e19a9a83c163e331a1d13b1892) Out-of-bounds Readhttps://vuldb.com/submit/880112third-party-advisory
• github.comhttps://github.com/liftoff-sr/CIPster/issues/46exploitissue-tracking
• github.comhttps://github.com/liftoff-sr/CIPster/commit/e8e9dba09bf56962807d3504b783ccdb6287f3e4patch
• github.comhttps://github.com/liftoff-sr/CIPster/product