CVE-2026-42499

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.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• 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

0.80% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 53.9% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-09-04.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

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

2026-05-07 19:41Z3 MO AGO

Last updated

2026-09-04 12:04Z4 HR AGO

Reserved

2026-04-28

Assigning CNA

Go

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

• CWE-1046Creation of Immutable Text Using String ConcatenationBase

Data version

5.2

Document digest

f6c9298e03f8d8436d5734ef8e0de78eab72893df887d37b6f25841cafa95b4a

• go.devhttps://go.dev/issue/78987
• go.devhttps://go.dev/cl/771520
• groups.google.comhttps://groups.google.com/g/golang-announce/c/qcCIEXso47M
• pkg.go.devhttps://pkg.go.dev/vuln/GO-2026-4977
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-42499vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2467809https://bugzilla.redhat.com/show_bug.cgi?id=2467809issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42499.jsonx_sadp-csaf-vex
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:59830vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:56785vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:56910vendor-advisoryx_refsource_REDHAT
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• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:60018vendor-advisoryx_refsource_REDHAT
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