Dashboard / CVE-2026-124040

CVE-2026-124040

CRITICAL 1 PoC
INFO Priority: 0.05 BB Relevance: 79/100
Published: 2026-11-06 Modified: 2026-11-11 First seen: 2026-11-06 Status: active

Attack Surface

Network No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: High
PR: None
UI: None
S: X
AT: Present
VC: High
VI: High
VA: High

Description

CivetWeb through 1.16, when built with USE_HTTP2 and enable_http2 on, contains a use-after-free vulnerability in handle_http2() that retains freed :method and :path pointers. Unauthenticated remote attackers can send a later HEADERS frame omitting these pseudo-headers to influence request method or path seen by access rules, or crash the server.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
civetweb civetweb 0
civetweb civetweb 0

References & Advisories (4)

Proof of Concept (1)

—
https://github.com/zeetee1235/CVE-2026-124040
nomi-sec

Bug Bounty Relevance

79 / 100
✓ Network accessible
✓ No authentication
✓ No user interaction
✓ PoC available (1)

CVSS Score

9.2 / 10.0 v4.0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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

EPSS — Exploitation Probability

0.51%
Raw Score 0.005140
Percentile 44.4%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00514
2026-11-12
0.00514
2026-11-10
0.00514
2026-11-09
0.00514
2026-11-08
0.00514
2026-11-07
0.00514

Intelligence Sources

mitre ref →
nvd ref →

External Links