7.5

CVE-2026-32280: Unexpected work during chain building in crypto/x509

Modified
AliasesRHSA-2026:22130RHSA-2026:23244UBUNTU-CVE-2026-32280
Published 08-04-2026Last modified 18-09-2026

Vulnerability summary

CVE-2026-32280 is a high (CVSS 7.5) vulnerability in go standard library crypto/x509. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 49.5% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 04-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.61%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 129 · Related 128
MGASA-2026-0143MGASA-2026-0147OPENSUSE-SU-2026:10514-1OPENSUSE-SU-2026:10525-1OPENSUSE-SU-2026:10664-1OPENSUSE-SU-2026:20570-1

Showing 100 of 130.

Timeline

  1. 08-04-2026
    PublishedVulnerability first disclosed.
  2. 18-09-2026
    Last modifiedVulnerability information updated.

Description

During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls.

CVSS metrics

8 scores · 8 sources · 1 version

EPSS trend

Probability

0.61%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.61% on 05-10-2026

05-10-202604-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard198 products
  • aactl< 0.4.12-r53
  • act< 0.2.87-r2
  • actions-runner-controller< 0.14.1-r0
  • actions-runner-controller-fips< 0.14.1-r0
  • addon-resizer< 1.8.23-r17
Alpine2 products
  • go≥ 1.26.0, < 1.25.9-r0 | ≥ 1.26.0, < 1.26.2-r0
  • rclone< 1.73.5-r0

2 vendors · 200 products · Showing 200 of 3827

References

208 links
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