CVE catalog
CVE-2026-110688
Cpanel::JSON::XS versions from 4.51 before 4.80 for Perl allow quadratic CPU use by revalidating the remaining buffer per value in incr_parse. At the first non-ASCII byte in a string, the decoder val
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.17% · Oct 25, 2026
Cpanel::JSON::XS versions from 4.51 before 4.80 for Perl allow quadratic CPU use by revalidating the remaining buffer per value in incr_parse. At the first non-ASCII byte in a string, the decoder validates UTF-8 from there to the end of its input. incr_parse decodes each buffered value with a fresh decoder, so every value revalidates the rest of the buffer, and doubling the input quadruples the work. A peer that sends about a megabyte of ordinary non-ASCII JSON in one read ties up the process for seconds of CPU time.
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 | libcpanel-json-xs-perl | sid | 4.80-1 | fixed |
| Debian | libcpanel-json-xs-perl | forky | 4.80-1 | fixed |
| Debian | libcpanel-json-xs-perl | trixie | 4.39-2~deb13u1 | vulnerable |
| Debian | libcpanel-json-xs-perl | trixie-security | 4.39-2~deb13u1 | vulnerable |
| Debian | libcpanel-json-xs-perl | bookworm | 4.35-1+deb12u1 | vulnerable |
| Debian | libcpanel-json-xs-perl | bookworm-security | 4.35-1+deb12u1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 16.04 | 3.0115-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 16.04 | 3.0210-1ubuntu1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 18.04 | 3.0225-1build1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 18.04 | 3.0239-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 20.04 | 4.12-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 20.04 | 4.12-1build1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 20.04 | 4.15-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 20.04 | 4.17-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 20.04 | 4.18-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 20.04 | 4.19-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 20.04 | 4.19-1build1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 20.04 | 4.19-1ubuntu0.1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 22.04 | 4.25-1build1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 22.04 | 4.25-1build2 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 22.04 | 4.27-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 22.04 | 4.27-1build1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 22.04 | 4.27-1ubuntu0.1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 22.04 | 4.27-1ubuntu0.2 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 24.04 | 4.37-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 24.04 | 4.37-1build1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 24.04 | 4.37-1build2 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 24.04 | 4.37-1build3 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 24.04 | 4.37-1ubuntu0.1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 26.10 | 4.40-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 26.10 | 4.42-1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 26.10 | 4.42-1build1 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 26.04 | 4.39-2 | vulnerable |
| Ubuntu | libcpanel-json-xs-perl | 26.04 | 4.40-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libcpanel-json-xs-perl | source | sid | 4.80-1 | not yet assigned | Not reported | Not reported |
| Debian | libcpanel-json-xs-perl | source | forky | 4.80-1 | not yet assigned | Not reported | Not reported |
| Debian | libcpanel-json-xs-perl | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | libcpanel-json-xs-perl | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libcpanel-json-xs-perl]Affected
Details (4)
4.35-1+deb12u1· amd64 · bookwormAffected
nvd · libcpanel-json-xs-perl · debian · bookworm; nvd · libcpanel-json-xs-perl · debian · 12
4.35-1+deb12u1· arm64 · bookwormAffected
nvd · libcpanel-json-xs-perl · debian · bookworm; nvd · libcpanel-json-xs-perl · debian · 12
4.35-1+deb12u1· amd64 · bookworm-securityAffected
nvd · libcpanel-json-xs-perl · debian · bookworm; nvd · libcpanel-json-xs-perl · debian · 12
4.35-1+deb12u1· arm64 · bookworm-securityAffected
nvd · libcpanel-json-xs-perl · debian · bookworm; nvd · libcpanel-json-xs-perl · debian · 12
[Debian 13 (Trixie)]
- [libcpanel-json-xs-perl]Affected
Details (4)
4.39-2~deb13u1· amd64 · trixieAffected
nvd · libcpanel-json-xs-perl · debian · 13
4.39-2~deb13u1· arm64 · trixieAffected
nvd · libcpanel-json-xs-perl · debian · 13
4.39-2~deb13u1· amd64 · trixie-securityAffected
nvd · libcpanel-json-xs-perl · debian · 13
4.39-2~deb13u1· arm64 · trixie-securityAffected
nvd · libcpanel-json-xs-perl · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_12217-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-110688]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-110688]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-110688]
- [https://security-tracker.debian.org/tracker/CVE-2026-110688]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110688.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]