CVE-2026-42256

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.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• 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

0.30% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 22.3% of scored records. A rank, not a probability.

NVD base score

6.0 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Analyzed. NVD last modified this record on 2026-07-24.

Red Hat severity

Moderate. 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

2026-05-09 19:38Z3 MO AGO

Last updated

2026-05-11 17:04Z3 MO AGO

Reserved

2026-04-26

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 6.0)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-770Allocation of Resources Without Limits or ThrottlingBase
• CWE-1322Use of Blocking Code in Single-threaded, Non-blocking ContextBase
• CWE-606Unchecked Input for Loop ConditionBase

Data version

5.2

Document digest

f05d5b19c89bb1c6cac59d77ba724ce380e7a2128c19e7267534bc1c3a7a525b

• github.comhttps://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7x_refsource_CONFIRM
• github.comhttps://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612x_refsource_MISC
• github.comhttps://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4x_refsource_MISC
• github.comhttps://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758x_refsource_MISC
• github.comhttps://github.com/ruby/net-imap/releases/tag/v0.4.24x_refsource_MISC
• github.comhttps://github.com/ruby/net-imap/releases/tag/v0.5.14x_refsource_MISC
• github.comhttps://github.com/ruby/net-imap/releases/tag/v0.6.4x_refsource_MISC