CVE catalog
CVE-2026-14803
Mojo::JSON versions before 9.47 for Perl allow memory exhaustion via unbounded recursion in the pure-Perl decoder. The pure-Perl decode path (`_decode_value` dispatching to `_decode_array` and `_deco
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.53% · Oct 25, 2026
Mojo::JSON versions before 9.47 for Perl allow memory exhaustion via unbounded recursion in the pure-Perl decoder. The pure-Perl decode path (`_decode_value` dispatching to `_decode_array` and `_decode_object`) recurses with no depth limit, so a small deeply nested JSON document can consume excessive memory. This path is the default when Cpanel::JSON::XS is not installed or `MOJO_NO_JSON_XS=1` is set; the Cpanel::JSON::XS fast path is not affected. Any caller that decodes an untrusted JSON body, for example `Mojo::Message::json` reached through `$c->req->json`, can exhaust process memory and cause denial of service.
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 | libmojolicious-perl | sid | 9.53+dfsg-1 | fixed |
| Debian | libmojolicious-perl | forky | 9.49+dfsg-1 | fixed |
| Debian | libmojolicious-perl | trixie | 9.39+dfsg-1 | vulnerable |
| Debian | libmojolicious-perl | bookworm | 9.31+dfsg-1 | vulnerable |
| Cpe | libmojolicious-perl | Not reported | Not reported | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libmojolicious-perl | source | sid | 9.47+dfsg-1 | not yet assigned | Not reported | [1141586] |
| Debian | libmojolicious-perl | source | forky | 9.47+dfsg-1 | not yet assigned | Not reported | [1141586] |
| Debian | libmojolicious-perl | source | trixie | (unfixed) | not yet assigned | Not reported | [1141586] |
| Debian | libmojolicious-perl | source | bookworm | (unfixed) | not yet assigned | Not reported | [1141586] |
Notes
[trixie] libmojolicious-perl: Minor issue [bookworm] libmojolicious-perl: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libmojolicious-perl]Affected
Details (4)
9.31+dfsg-1· all · bookwormAffected
nvd · libmojolicious-perl · debian · bookworm; nvd · libmojolicious-perl · debian · 12
9.31+dfsg-1· all · bookwormAffected
nvd · libmojolicious-perl · debian · bookworm; nvd · libmojolicious-perl · debian · 12
9.37+dfsg-2~bpo12+1· all · bookworm-backportsAffected
nvd · libmojolicious-perl · debian · bookworm; nvd · libmojolicious-perl · debian · 12
9.37+dfsg-2~bpo12+1· all · bookworm-backportsAffected
nvd · libmojolicious-perl · debian · bookworm; nvd · libmojolicious-perl · debian · 12
[Debian 13 (Trixie)]
- [libmojolicious-perl]Affected
Details (4)
9.39+dfsg-1· all · trixieAffected
nvd · libmojolicious-perl · debian · 13
9.39+dfsg-1· all · trixieAffected
nvd · libmojolicious-perl · debian · 13
9.42+dfsg-1~bpo13+2· all · trixie-backportsAffected
nvd · libmojolicious-perl · debian · 13
9.42+dfsg-1~bpo13+2· all · trixie-backportsAffected
nvd · libmojolicious-perl · debian · 13
Observed:
References
- [http://www.openwall.com/lists/oss-security/2026/07/06/2]
- [https://github.com/mojolicious/mojo/commit/cc38b0554275c4d84f6b8b49bcbbc1bec2068fe1.patch]
- [https://metacpan.org/release/SRI/Mojolicious-9.47/changes]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-14803]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-14803]
- [https://security-tracker.debian.org/tracker/CVE-2026-14803]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]