Plausible Code Execution Vulnerability in PREVAIL by VBPF
CVE-2026-53671

9.3CRITICAL

Key Information:

Vendor

Vbpf

Status
Prevail
Vendor
CVE Published:
2 September 2026

What is CVE-2026-53671?

A vulnerability in PREVAIL, a Polynomial-Runtime eBPF Verifier, allows an attacker to manipulate context fields within eBPF programs. Before version 0.2.4, the abstract transformer improperly handles writes via a T_CTX-typed base register, treating them as no-ops. An attacker can exploit this flaw to overwrite context fields and dereference control over addresses, potentially compromising the integrity of the verifier. This issue has been addressed in version 0.2.4, emphasizing the need for users to update to this secure version to mitigate potential risks.

Affected Version(s)

prevail < 0.2.4

References

https://github.com/vbpf/prevail/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/vbpf/prevail/commit/de65234f67d2608b54...
x_refsource_MISC
https://github.com/vbpf/prevail/releases/tag/v0.2.4
x_refsource_MISC

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.