CVE-2026-39820
High
Description
Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.
SeverityHigh
CVSS7.5
Exploit probability—
ProductGo
PublishedMay 7, 2026
First seenMay 7, 2026
Weakness typeCWE-407CWE-407
How to fix
Update
- golang go1.25.10, 1.26.3 or later
- stdlib1.25.10, 1.26.3 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:68334
- access.redhat.com/errata/RHSA-2026:50319
- access.redhat.com/errata/RHSA-2026:59830
- access.redhat.com/errata/RHSA-2026:65838
- access.redhat.com/errata/RHSA-2026:56852
- access.redhat.com/errata/RHSA-2026:60018
- access.redhat.com/errata/RHSA-2026:57482
- access.redhat.com/errata/RHSA-2026:54552
- access.redhat.com/errata/RHSA-2026:50336
- access.redhat.com/errata/RHSA-2026:57845
- access.redhat.com/errata/RHSA-2026:57914
- access.redhat.com/errata/RHSA-2026:57401
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| golang go | v < 1.25.10, 1.26.0 ≤ v < 1.26.3 | 1.25.10, 1.26.3 |
| stdlibGo | v < 1.25.10, 1.26.0-0 ≤ v < 1.26.3 | 1.25.10, 1.26.3 |
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