CVE catalog
CVE-2026-47241
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a raw string argument which is only validated to
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.38% · Oct 25, 2026
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a raw string argument which is only validated to prevent CRLF injection and then sent verbatim. If this string is derived from user-controlled input, an attacker can force the next command to be absorbed as a continuation of the first command. This will cause the first command to eventually fail, but also prevents it from returning until another command is sent (from another thread). That other command will not return until the connection is closed. This vulnerability is fixed in 0.6.5 and 0.5.15.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | ruby3.1 | bookworm | 3.1.2-7+deb12u1 | vulnerable |
| Debian | ruby3.1 | bookworm-security | 3.1.2-7+deb12u1 | vulnerable |
| Cpe | ruby3.1 | Not reported | Not reported | vulnerable |
| Alpine | ruby-net-imap | 3.24 | 0.5.15-r0 | fixed |
| Alpine | ruby-net-imap | 3.23 | 0.5.15-r0 | fixed |
| Alpine | ruby-net-imap | 3.21 | 0.4.25-r0 | fixed |
| Alpine | ruby-net-imap | 3.22 | 0.5.15-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | ruby3.1 | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Alpine | ruby-net-imap | apk | 3.24 | 0.5.15-r0 | Not reported | ALPINE-CVE-2026-47241 | Not reported |
| Alpine | ruby-net-imap | apk | 3.23 | 0.5.15-r0 | Not reported | ALPINE-CVE-2026-47241 | Not reported |
| Alpine | ruby-net-imap | apk | 3.21 | 0.4.25-r0 | Not reported | ALPINE-CVE-2026-47241 | Not reported |
| Alpine | ruby-net-imap | apk | 3.22 | 0.5.15-r0 | Not reported | ALPINE-CVE-2026-47241 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libruby3.1]Affected
Source package: [ruby3.1]
Details (4)
3.1.2-7+deb12u1· amd64 · bookwormAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· arm64 · bookwormAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· amd64 · bookworm-securityAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· arm64 · bookworm-securityAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
- [ruby3.1]Affected
Details (4)
3.1.2-7+deb12u1· amd64 · bookwormAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· arm64 · bookwormAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· amd64 · bookworm-securityAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· arm64 · bookworm-securityAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
- [ruby3.1-dev]Affected
Source package: [ruby3.1]
Details (4)
3.1.2-7+deb12u1· amd64 · bookwormAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· arm64 · bookwormAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· amd64 · bookworm-securityAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· arm64 · bookworm-securityAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
- [ruby3.1-doc]Affected
Source package: [ruby3.1]
Details (4)
3.1.2-7+deb12u1· all · bookwormAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· all · bookwormAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· all · bookworm-securityAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
3.1.2-7+deb12u1· all · bookworm-securityAffected
nvd · ruby3.1 · debian · bookworm; nvd · ruby3.1 · debian · 12
[Debian 13 (Trixie)]
- [libruby3.3]Affected
Source package: [ruby3.3]
Details (2)
3.3.8-2· amd64 · trixieAffected
nvd · ruby3.3 · debian · 13
3.3.8-2· arm64 · trixieAffected
nvd · ruby3.3 · debian · 13
- [ruby3.3]Affected
Details (2)
3.3.8-2· amd64 · trixieAffected
nvd · ruby3.3 · debian · 13
3.3.8-2· arm64 · trixieAffected
nvd · ruby3.3 · debian · 13
- [ruby3.3-dev]Affected
Source package: [ruby3.3]
Details (2)
3.3.8-2· amd64 · trixieAffected
nvd · ruby3.3 · debian · 13
3.3.8-2· arm64 · trixieAffected
nvd · ruby3.3 · debian · 13
- [ruby3.3-doc]Affected
Source package: [ruby3.3]
Details (2)
3.3.8-2· all · trixieAffected
nvd · ruby3.3 · debian · 13
3.3.8-2· all · trixieAffected
nvd · ruby3.3 · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_50728.json]
- [https://github.com/ruby/net-imap/security/advisories/GHSA-c4fp-cxrr-mj66]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-47241]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-47241]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-47241]
- [https://security-tracker.debian.org/tracker/CVE-2026-47241]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47241.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2379.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]