CVE-2026-39820
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Go standard library | net/mail | 0 < 1.25.10 | affected |
| Go standard library | net/mail | 1.26.0-0 < 1.26.3 | affected |
Weaknesses
- CWE-407: Inefficient Algorithmic Complexity
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
net/mail: golang: Go net/mail: Denial of Service via crafted email inputs
Additional References
- https://access.redhat.com/security/cve/CVE-2026-39820
- https://bugzilla.redhat.com/show_bug.cgi?id=2467820
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39820.json
- https://access.redhat.com/errata/RHSA-2026:34364
- https://access.redhat.com/errata/RHSA-2026:33574
- https://access.redhat.com/errata/RHSA-2026:33120
- https://access.redhat.com/errata/RHSA-2026:33123
- https://access.redhat.com/errata/RHSA-2026:33142
- https://access.redhat.com/errata/RHSA-2026:33150
References
- https://go.dev/issue/78566
- https://go.dev/cl/759940
- https://groups.google.com/g/golang-announce/c/qcCIEXso47M
- https://pkg.go.dev/vuln/GO-2026-4986
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