by Kastro
Paper/Archive/CVE-2026-55565

CVE-2026-55565

yamcs yamcs — Yamcs: Authenticated remote code execution via unescaped StreamSQL `LIKE` pattern compiled by Janino (`LikeExpression`)

EPSS 0.7%public exploitCVSS 9.9
critical.is priorityof 100
50
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 51.1.511 × 2010.2Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs LikeExpression.fillCode_getValueReturn in yamcs-core/src/main/java/org/yamcs/yarch/streamsql/LikeExpression.java inserts an unescaped LIKE pattern into Java source compiled by Expression.getCompiledExpression through SimpleCompiler.cook instead of applying ValueExpression.escapeJavaString. The pattern can originate from POST /api/archive/{instance}:executeSql, POST /api/archive/{instance}:streamSql, POST /api/archive/{instance}/tables/{table}:readRows, GET /api/archive/{instance}/events, or activity searches, including paths available with ReadTables, ReadEvents, or ReadActivities. A quote in the pattern can inject Java that runs as the Yamcs server process. This issue is fixed in versions 5.12.8 and 5.13.2.

Affected

ProductAffectedFixed inSource
yamcs< 5.12.8–CNA
yamcs>= 5.13.0, < 5.13.2–CNA

Scores by source

GitHub_M (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/yamcs/yamcs/security/advisories/GHSA-c64q-hj4j-375frefgithub.com/yamcs/yamcs/commit/640e1598b7097b521692e89dd47a39b6cb1fc663refgithub.com/yamcs/yamcs/commit/a8fb4a0693fa62a6eb729b26016d1090dd8b289crefgithub.com/yamcs/yamcs/releases/tag/yamcs-5.12.8refgithub.com/yamcs/yamcs/releases/tag/yamcs-5.13.2