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CVE-2025-66560 Quarkus

Affected softwareQuarkus
Severity7.5 High CVSS 3.1 2 scores
Fixed in3.20.5, 3.27.2, 3.31.0
WeaknessCWE-770
Published7 Jan 2026
Updated7 Oct 2026

Description

Quarkus is a Cloud Native, (Linux) Container First framework for writing Java applications. Prior to versions 3.31.0, 3.27.2, and 3.20.5, a vulnerability exists in the HTTP layer of Quarkus REST related to response handling. When a response is being written, the framework waits for previously written response chunks to be fully transmitted before proceeding. If the client connection is dropped during this waiting period, the associated worker thread is never released and becomes permanently blocked. Under sustained or repeated occurrences, this can exhaust the available worker threads, leading to degraded performance, or complete unavailability of the application. This issue has been patched in versions 3.31.0, 3.27.2, and 3.20.5. A workaround involves implementing a health check that monitors the status and saturation of the worker thread pool to detect abnormal thread retention early.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.38% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/quarkusio/quarkus/security/advisories/GHSA-5rfx-cp42-p624 : the maintainers' own security advisory: names the version that fixes it, so the fix is the difference between two releases

CVSS

7.5 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary published
CVSS 3.1 5.9 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H security-advisories@github.com Secondary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.quarkus:quarkus-rest 0 3.20.5 unbounded
io.quarkus:quarkus-rest 3.21.0 3.27.2 unbounded
io.quarkus:quarkus-rest 3.30.0 3.31.0 unbounded

Products and versions

2 products, 6 version entries
SourceVendorProductSchemeAffected versions
osv io.quarkus quarkus-rest generic ＜ 3.20.5 · ≥ 3.21.0 and ＜ 3.27.2 · ≥ 3.30.0 and ＜ 3.31.0
nvd quarkus quarkus generic ＜ 3.20.5 · ≥ 3.21.0 and ＜ 3.27.2 · ≥ 3.30.0 and ＜ 3.31.0

References

URLTags
https://github.com/quarkusio/quarkus/security/advisories/GHSA-5rfx-cp42-p624 advisory
https://github.com/quarkusio/quarkus PACKAGE

Timeline
Published2026-01-07By the CVE Program.
NVD record modified2026-10-07NVD's own last-modified date for this record.