7.5

CVE-2026-42499: go standard library net/mail

CVSS: 7.5v3.1HighModified
AliasesRHSA-2026:17713RHSA-2026:17714UBUNTU-CVE-2026-42499
Published 07-05-2026Last modified 18-09-2026

Vulnerability summary

CVE-2026-42499 is a high (CVSS 7.5) vulnerability in go standard library net/mail. EPSS estimates a 0.80% chance of exploitation in the next 30 days, higher than 55.7% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.80%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 57 · Related 58

Timeline

  1. 07-05-2026
    PublishedVulnerability first disclosed.
  2. 18-09-2026
    Last modifiedVulnerability information updated.

Description

Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.80%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

0.00 pp

From 0.80% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.80%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard200 products
  • aactl< 0.4.12-r50 | < 0.4.12-r51
  • act< 0.2.88-r2
  • actions-runner-controller-fips< 0.14.1-r2 | All versions (No fix recorded) | < 0.14.1-r1
  • addon-resizerAll versions (No fix recorded)
  • addon-resizer-fipsAll versions (No fix recorded)

1 vendor · 200 products · Showing 200 of 3321. Use Open JSON for the complete list.

References

113 links
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Showing 100 of 113. Use Open JSON for the complete list.