Dashboard / CVE-2026-123611

CVE-2026-123611

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 63/100
Published: 2026-11-08 Modified: 2026-11-13 First seen: 2026-11-08 Status: active

Attack Surface

Network No Auth No Interaction

CVSS Vector Breakdown

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

Description

rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X25519, causing later ClientHellos to send only classical shares and lose post-quantum confidentiality.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
rustls rustls 0 < 0.23.46
rustls rustls 0 < 0.23.46

References & Advisories (2)

Bug Bounty Relevance

63 / 100
✓ Network accessible
✓ No authentication
✓ No user interaction

CVSS Score

6.3 / 10.0 v4.0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/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

0.19%
Raw Score 0.001880
Percentile 8.6%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00188
2026-11-12
0.00188
2026-11-10
0.00188
2026-11-09
0.00188
2026-11-08
0.00188

Intelligence Sources

mitre ref →
nvd ref →

External Links