CVE-2022-26650 | Apache ShenYu (incubating) Regular expression denial of service

In Apache ShenYui, ShenYu-Bootstrap, RegexPredicateJudge.java uses Pattern.matches(conditionData.getParamValue(), realData) to make judgments, where both parameters are controllable by the user. This can cause an attacker pass in malicious regular expressions and characters causing a resource exhaustion. This issue affects Apache ShenYu (incubating) 2.4.0, 2.4.1 and 2.4.2 and is fixed in 2.4.3.

Published: 2022-05-17 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-26650 is rated Moderate Risk (60.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.43%). EPSS rose +1.35% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2022-26650

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.09% 2.43% +1.35%
2 2026-04-15 1.26% 1.09% -0.17%
3 2025-11-21 — 1.26% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-26650

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2022-26650

GitHub Security Advisory for CVE-2022-26650

GHSA-cw56-j3fm-7w57 · Severity: high · Ecosystem: maven — Regular expression denial of service in Apache ShenYu

Affected software / configurations for CVE-2022-26650

Vendor Product Version Raw CPE
apache shenyu 2.4.0 cpe:2.3:a:apache:shenyu:2.4.0:*:*:*:*:*:*:*
apache shenyu 2.4.1 cpe:2.3:a:apache:shenyu:2.4.1:*:*:*:*:*:*:*
apache shenyu 2.4.2 cpe:2.3:a:apache:shenyu:2.4.2:*:*:*:*:*:*:*

References for CVE-2022-26650

URL Tags
http://www.openwall.com/lists/oss-security/2022/05/17/3 Mailing List Patch Third Party Advisory
https://lists.apache.org/thread/8rp33m3nm4bwtx3qx76mqynth3t3d673 Mailing List Vendor Advisory
cvelogic Threat Intelligence