No exploitation reportedFix available

CVE-2022-28739

Q: Is CVE-2022-28739 actively exploited?

Active exploitation of CVE-2022-28739 has not been confirmed. Its EPSS score was 4.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2022-28739?

CVE-2022-28739 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

No exploitation reported by the sources we read.

Published2022-05-09
Fixed in3.1.2 · 3.0.4 · 2.7.6 · 2.6.10
WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

There is a buffer over-read in Ruby before 2.6.10, 2.7.x before 2.7.6, 3.x before 3.0.4, and 3.1.x before 3.1.2. It occurs in String-to-Float conversion, including Kernel#Float and String#to_f.

Timeline

dates in UTC

2022-05-0918:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-28739?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-28739?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Ruby

Branch	Affected	Fixed in	Source
3.1	≥ 3.1.0, < 3.1.2	3.1.2	NVD
3.0	≥ 3.0.0, < 3.0.4	3.0.4	NVD
2.7	≥ 2.7.0, < 2.7.6	2.7.6	NVD
2.6	< 2.6.10	2.6.10	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
9.0	= 9.0	no fix published	NVD
10.0	= 10.0	no fix published	NVD
11.0	= 11.0	no fix published	NVD

Apple macos

Branch	Affected	Fixed in	Source
12.x	≥ 12.0, < 12.6.1	12.6.1	NVD
11.x	≥ 11.0, < 11.7.1	11.7.1	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Ruby to 3.1.2 · 3.0.4 · 2.7.6 · 2.6.10

Advisories and patches

www.ruby-lang.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
NVDweakness (CWE)CWE-125read 2026-10-23
FIRST EPSSEPSS score4.4 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: 2022-05-09
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2022-28739?

There is a buffer over-read in Ruby before 2.6.10, 2.7.x before 2.7.6, 3.x before 3.0.4, and 3.1.x before 3.1.2. It occurs in String-to-Float conversion, including Kernel#Float and String#to_f.

Is CVE-2022-28739 actively exploited?

Active exploitation of CVE-2022-28739 has not been confirmed. Its EPSS score was 4.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-28739?

CVE-2022-28739 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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