CVE catalog
CVE-2026-54902
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to version 3.17.2, is vulnerable to Use-After-Free when in SAJ mode. The Oj::Parser does not protect cached obj
- Severity
- Medium · CVSS 6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.50% · Oct 27, 2026
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to version 3.17.2, is vulnerable to Use-After-Free when in SAJ mode. The Oj::Parser does not protect cached object keys (≥ 35 bytes) from garbage collection, and a Ruby callback that triggers GC inside hash_end can cause the key string to be reclaimed while the C parser still holds a pointer to it. The subsequent access to the freed string VALUE results in a segfault, confirmed by an RIP pointing to address 0x4242 (a canary-style pattern suggesting control over the freed memory's content). This issue has been fixed in version 3.17.2.
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 | ruby-oj | sid | 3.17.7-1 | fixed |
| Debian | ruby-oj | forky | 3.17.7-1 | fixed |
| Debian | ruby-oj | trixie | 3.16.3-1 | vulnerable |
| Debian | ruby-oj | trixie-security | 3.16.3-1+deb13u1 | fixed |
| Debian | ruby-oj | bookworm | 3.14.2-1 | vulnerable |
| Debian | ruby-oj | bookworm-security | 3.14.2-1+deb12u1 | fixed |
| Cpe | ruby-oj | Not reported | Not reported | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | ruby-oj | source | sid | 3.17.6-2 | not yet assigned | Not reported | Not reported |
| Debian | ruby-oj | source | forky | 3.17.6-2 | not yet assigned | Not reported | Not reported |
| Debian | ruby-oj | source | trixie | 3.16.3-1+deb13u1 | not yet assigned | Not reported | Not reported |
| Debian | ruby-oj | source | bookworm | 3.14.2-1+deb12u1 | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [ruby-oj]Affected
Details (2)
3.14.2-1· amd64 · bookwormAffected · Fixed:
3.14.2-1+deb12u1nvd · ruby-oj · debian · bookworm; nvd · ruby-oj · debian · 12
3.14.2-1· arm64 · bookwormAffected · Fixed:
3.14.2-1+deb12u1nvd · ruby-oj · debian · bookworm; nvd · ruby-oj · debian · 12
[Debian 13 (Trixie)]
- [ruby-oj]Affected
Details (3)
3.16.3-1+b5· amd64 · trixieAffected · Fixed:
3.16.3-1+deb13u1nvd · ruby-oj · debian · 13
3.16.3-1+b5· arm64 · trixieAffected · Fixed:
3.16.3-1+deb13u1nvd · ruby-oj · debian · 13
3.16.3-1+deb13u1· amd64 · trixie-securityFixed · Fixed:
3.16.3-1+deb13u1nvd · ruby-oj · debian · 13
Observed:
References
- [https://github.com/ohler55/oj/security/advisories/GHSA-m578-w5vf-rfcm]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-54902]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-54902]
- [https://security-tracker.debian.org/tracker/CVE-2026-54902]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54902.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]