cve.bz

CVE-2026-69218

7.5 highEPSS 0.6%

High (7.5). EPSS 0.6% chance of exploitation in the next 30 days. Fixed in org.http4s:http4s-ember-core_2.12 0.23.35.

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, When Ember receives an HTTP/2 HEADERS or PUSH_PROMISE frame without END_HEADERS, H2Connection buffers the header block and subsequent CONTINUATION fragments without a size bound. A remote peer can keep an incomplete block open and exhaust heap memory before request decoding, affecting an ember-server or ember-client configured with withHttp2. The remediation tracks accumulated size against SETTINGS_MAX_HEADER_LIST_SIZE derived from EmberServerBuilder.maxHeaderSize or EmberClientBuilder.maxResponseHeaderSize, sends GOAWAY when the limit is exceeded, and applies receiveHeadersTimeout to incomplete blocks. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Severity

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
EPSS
0.6% chance of exploitation in the next 30 days; higher than 50% of CVEs (scores of 2026-10-31)
CWE
CWE-770
Published
Modified
Record from
the NVD, synced

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-cp4q-fqw9-4hf6Mavenorg.http4s:http4s-ember-core_2.12<0.23.350.23.35
GHSA-cp4q-fqw9-4hf6Mavenorg.http4s:http4s-ember-core_2.13<0.23.350.23.35
GHSA-cp4q-fqw9-4hf6Mavenorg.http4s:http4s-ember-core_3<0.23.350.23.35
GHSA-cp4q-fqw9-4hf6Mavenorg.http4s:http4s-ember-core_2.13>=1.0.0-M1 <1.0.0-M471.0.0-M47
GHSA-cp4q-fqw9-4hf6Mavenorg.http4s:http4s-ember-core_3>=1.0.0-M1 <1.0.0-M471.0.0-M47

References

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