CVE-2026-66357

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

Not scored by EPSS

EPSS percentile

Not scored by EPSS

NVD base score

The NVD has published no score for this record

NVD CVSS vector

No NVD score to derive

NVD analysis status

Not recorded

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-01 14:40Z2 HR AGO

Last updated

2026-09-01 15:56Z1 HR AGO

Reserved

2026-08-17

Assigning CNA

EEF

Record state

PUBLISHED

Severity

High (CVSS 8.3)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:L/SA:N

Weaknesses

• CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Base

Data version

5.2

Document digest

6d8236e7081270c4c3a2766eecfaf7f70f9f3b844079007220229f9e185bbb39

• github.comhttps://github.com/erlang/otp/security/advisories/GHSA-qh2f-33hj-37qfvendor-advisory
• cna.erlef.orghttps://cna.erlef.org/cves/CVE-2026-66357.htmlrelated
• osv.devhttps://osv.dev/vulnerability/EEF-CVE-2026-66357related
• github.comhttps://github.com/erlang/otp/commit/220d618d2479a7180b4a06d0c5aacfaa4af4a85bpatch
• github.comhttps://github.com/erlang/otp/commit/273d8958de38ff2a7fe0c5dcc5b6bfe6f65717f3patch
• github.comhttps://github.com/erlang/otp/commit/e640d599287d2eba919e6f13b91f042d7dbe6ff4patch