CVE-2025-27220

ADVISORY - github

Summary

There is a possibility for Regular expression Denial of Service (ReDoS) by in the cgi gem. This vulnerability has been assigned the CVE identifier CVE-2025-27220. We recommend upgrading the cgi gem.

Details

The regular expression used in CGI::Util#escapeElement is vulnerable to ReDoS. The crafted input could lead to a high CPU consumption.

This vulnerability only affects Ruby 3.1 and 3.2. If you are using these versions, please update CGI gem to version 0.3.5.1, 0.3.7, 0.4.2 or later.

Affected versions

cgi gem versions <= 0.3.5, 0.3.6, 0.4.0 and 0.4.1.

Credits

Thanks to svalkanov for discovering this issue. Also thanks to nobu for fixing this vulnerability.

EPSS Score⁠: 0.00517 (0.658)

Common Weakness Enumeration (CWE)

ADVISORY - nist

CWE-1333⁠

Inefficient Regular Expression Complexity

ADVISORY - github

CWE-1333⁠

Inefficient Regular Expression Complexity

ADVISORY - gitlab

CWE-1035⁠

OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities

CWE-1333⁠

Inefficient Regular Expression Complexity

CWE-937⁠

OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities

ADVISORY - redhat

CWE-1333⁠

Inefficient Regular Expression Complexity

Impacted images

Advisories

NIST

CREATED

8 months ago

UPDATED

6 days ago

ADVISORY IDCVE-2025-27220⁠

EXPLOITABILITY SCORE

2.2

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-1333⁠

CVSS SCORE

4medium

GitHub

CREATED

8 months ago

UPDATED

6 days ago

ADVISORY IDGHSA-mhwm-jh88-3gjf⁠

EXPLOITABILITY SCORE

2.2

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-1333⁠

CVSS SCORE

6.3medium

Debian

CREATED

8 months ago

UPDATED

1 month ago

ADVISORY IDCVE-2025-27220⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

Ubuntu

CREATED

8 months ago

UPDATED

4 months ago

ADVISORY IDCVE-2025-27220⁠

EXPLOITABILITY SCORE

3.9

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

7.5medium

GitLab

CREATED

8 months ago

UPDATED

8 months ago

ADVISORY ID

CVE-2025-27220

EXPLOITABILITY SCORE

2.2

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-1035⁠CWE-1333⁠CWE-937⁠

CVSS SCORE

4medium

Alma

CREATED

6 months ago

UPDATED

6 months ago

ADVISORY IDALSA-2025:4488⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Amedium

Amazon

CREATED

7 months ago

UPDATED

7 months ago

ADVISORY IDALAS2023-2025-929⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Amedium

Red Hat

CREATED

8 months ago

UPDATED

8 months ago

ADVISORY IDCVE-2025-27220⁠

EXPLOITABILITY SCORE

2.2

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-1333⁠

CVSS SCORE

4medium

Rocky

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY IDRLSA-2025:4063⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Alow

Rocky

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY IDRLSA-2025:4487⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Alow

Rocky

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY IDRLSA-2025:4488⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Alow

Oracle

CREATED

7 months ago

UPDATED

7 months ago

ADVISORY IDELSA-2025-4063⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Amedium

Oracle

CREATED

6 months ago

UPDATED

6 months ago

ADVISORY IDELSA-2025-4487⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Amedium

Oracle

CREATED

6 months ago

UPDATED

6 months ago

ADVISORY IDELSA-2025-4488⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Amedium

Chainguard

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

CGA-2g28-g23g-qx95

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

Chainguard

CREATED

8 months ago

UPDATED

8 months ago

ADVISORY ID

CGA-6xvp-v5pg-cvj9

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

Chainguard

CREATED

8 months ago

UPDATED

8 months ago

ADVISORY ID

CGA-f8wr-vggg-73rm

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

Chainguard

CREATED

8 months ago

UPDATED

8 months ago

ADVISORY ID

CGA-p8hc-p46m-gh5w

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

Chainguard

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

CGA-x5qx-wpxw-hg6p

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

Photon

CREATED

8 months ago

UPDATED

2 months ago

ADVISORY ID

CVE-2025-27220

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

7.5high

minimos

CREATED

13 days ago

UPDATED

13 days ago

ADVISORY ID

MINI-2wvv-m9c2-w53p

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-49jr-937q-vx25

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-cr6c-4q8v-9pq4

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

7 months ago

UPDATED

7 months ago

ADVISORY ID

MINI-g3g5-ghh3-73cw

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-h83f-xfjx-qhqq

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-hgqx-qqw9-vr8x

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

8 months ago

UPDATED

8 months ago

ADVISORY ID

MINI-jpgx-h29f-cpw7

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-jvpw-x8wj-36rp

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-mcw7-xvch-4wp2

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-qr83-65c3-3p4m

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

7 months ago

UPDATED

7 months ago

ADVISORY ID

MINI-v7jm-jpr4-x324

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

7 months ago

UPDATED

7 months ago

ADVISORY ID

MINI-wcpv-vhcx-3jfh

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

8 months ago

UPDATED

8 months ago

ADVISORY ID

MINI-x449-3rrp-g8vq

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY