Immediate
Before a patch is released, reduce exposure immediately and only allow trusted sources to reach the affected service.
root@hackertop:~/vulnfeed/CVE-2026-43863#
CVE-2026-43863
LOW
CVE
⚠ Unpatched · Zero-day◉ PoC 公开
Lifecycle 4/7
mutt up to 2.3.1 crypt-gpgme.c data_object_to_stream function return value
LIFECYCLE
3.3
CVSS
Vulnerability Description
A vulnerability, which was classified as problematic, has been found in mutt up to 2.3.1 (Mail Client Software). This issue affects the function data_object_to_stream of the file crypt-gpgme.c. Upgrading to version 2.3.2 eliminates this vulnerability. Applying the patch fdc04a171777327218a1e78db504926c388b48c4 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
Root Cause Analysis
Using CWE to declare the problem leads to CWE-253. The product incorrectly checks a return value from a function, which prevents it from detecting errors or exceptional conditions.
Impact: Impacted is availability.
Countermeasure: Upgrading to version 2.3.2 eliminates this vulnerability. Applying the patch fdc04a171777327218a1e78db504926c388b48c4 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
Impact: Impacted is availability.
Countermeasure: Upgrading to version 2.3.2 eliminates this vulnerability. Applying the patch fdc04a171777327218a1e78db504926c388b48c4 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
Validation (PoC/EXP) - Looking for Contributors
No public PoC yet
Public validation traces already exist. Community contributors can extend them with richer reproduction content.
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Mitigation Plan - Sorted by Priority
High
Enable extra access controls, WAF/ACL, or reverse-proxy rules for mutt.
High
Use logs and IOCs to hunt through production traffic and confirm whether exploitation traces already exist.
Medium
Keep this issue on the watch list and follow vendor advisories, rollback notices, and new variants.
Vulnerability Lifecycle - Click each stage to inspect details
The issue has entered HackerTop VulnFeed and is now being tracked by the community.
The vulnerability has been synchronized into the platform and entered the visible triage flow.
Initial impact validation is complete based on current disclosure, technical details, and public intelligence.
A public proof path already exists for reference.
No in-the-wild exploitation has been confirmed yet, but monitoring should continue.
No vendor patch is available yet. Apply temporary mitigations first.
Reduce exposure, restrict access, and inspect logs until a permanent fix is available.
3.3
CVSS
Temp Score
3.3
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metric Details
Attack Vector
Attack Vector
Network
Attack Complexity
Attack Complexity
Low
Privileges Required
Privileges Required
None
User Interaction
User Interaction
None
Confidentiality Impact
Confidentiality Impact
High
Integrity Impact
Integrity Impact
High
Availability Impact
Availability Impact
High
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CVE-2026-43863 · CVSS 3.3 · Active Threat
