No exploitation reportedFix available

CVE-2023-28755

Q: Is CVE-2023-28755 actively exploited?

Active exploitation of CVE-2023-28755 has not been confirmed. Its EPSS score was 2.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-28755?

CVE-2023-28755 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

No exploitation reported by the sources we read.

Published2023-03-31
Fixed in0.12.1 · 0.11.1 · 0.10.2 · 0.10.0.1
WeaknessCWE-1333

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

A ReDoS issue was discovered in the URI component through 0.12.0 in Ruby through 3.2.1. The URI parser mishandles invalid URLs that have specific characters. It causes an increase in execution time for parsing strings to URI objects. The fixed versions are 0.12.1, 0.11.1, 0.10.2 and 0.10.0.1.

Timeline

dates in UTC

2023-03-3104:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2023-28755?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-28755?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV · NVD

uri

Branch	Affected	Fixed in	Source
0.12	≥ 0.12.0, < 0.12.1	0.12.1	OSV
0.11	≥ 0.11.0, < 0.11.1	0.11.1	OSV
0.10	≥ 0.10.1, < 0.10.2	0.10.2	OSV
0.10	< 0.10.0.1	0.10.0.1	OSV

Ruby-lang uri

Branch	Affected	Fixed in	Source
0.10	≤ 0.10.0	no fix published	NVD
0.10	= 0.10.1	no fix published	NVD
0.11	= 0.11.0	no fix published	NVD
0.12	= 0.12.0	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
36.x	= 36	no fix published	NVD
37.x	= 37	no fix published	NVD
38.x	= 38	no fix published	NVD

1 more product in the sources.

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

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

rubyAlmaLinux:9all versions · fixed in 3.0.7-162.el9_4and 4 other packages
rubyAlmaLinux:9all versions · fixed in 3.1.4-143.module_el9.3.0+60+5ebc989aand 5 other packages
rubyAlmaLinux:8all versions · fixed in 2.5.9-111.module_el8.9.0+3635+c6f99506and 4 other packages
rubyAlmaLinux:8all versions · fixed in 2.5.9-112.module_el8.10.0+3871+342e2c2fand 4 other packages
rubyAlmaLinux:8all versions · fixed in 2.7.8-139.module_el8.8.0+3578+2b4b06daand 4 other packages
rubyAlmaLinux:8all versions · fixed in 3.0.7-143.module_el8.10.0+3852+ce828b19and 4 other packages
rubyAlmaLinux:8all versions · fixed in 3.1.4-142.module_el8.9.0+3746+91b8233aand 5 other packages
rubygem-abrtAlmaLinux:8all versions · fixed in 0.3.0-4.module_el8.10.0+3871+342e2c2fand 1 other package

143 more package ranges on OSV.dev

Full record on NVD

Fix

Update uri to 0.12.1 · 0.11.1 · 0.10.2 · 0.10.0.1

Advisories and patches

github.comRelease Notes
www.ruby-lang.orgRelease Notes
www.ruby-lang.orgRelease Notes
www.ruby-lang.orgVendor Advisory

Detection

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

Sources

CISA-ADPSSVC decisionnone2025-02-14
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.15.32025-02-14
NVDCVSS 3.15.3read 2026-10-23
CISA-ADPweakness (CWE)CWE-13332025-02-14
NVDweakness (CWE)CWE-1333read 2026-10-23
FIRST EPSSEPSS score2.6 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published: 2023-03-31
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-28755?

Is CVE-2023-28755 actively exploited?

Active exploitation of CVE-2023-28755 has not been confirmed. Its EPSS score was 2.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-28755?

CVE-2023-28755 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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