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CVE-2026-45712

MEDIUM Exploitation: PoC
5.9
CVSS 3.1
Description
Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the screenshot/print proxy (/proxy?data=…) maintains a package-level assets map[string]MessageAssets cache, but reads the map without holding assetsMutex while a long-running cleanup goroutine and (re-entrant) CSS-rewriting code path concurrently write to it under the lock. When the unsynchronized read coincides with a synchronized write, Go's runtime raises fatal error: concurrent map read and map write — a runtime.throw that is not recoverable by http.Server's handler-panic recover. The whole Mailpit process exits, taking the SMTP, POP3 and HTTP listeners down with it. Version 1.30.0 contains a patch.

Metadata

CVE ID
CVE-2026-45712
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-13 05:51 UTC
Published
2026-07-20 14:59 UTC
Last updated
2026-07-20 15:33 UTC
Primary CWE
CWE-362
CWE-362: Concurrent Execution using Shared Resource with Imp…
Vendor / Product
axllent / mailpit
Sources
cve.org  ·  NVD

Severity & Metrics

5.9 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
axllent mailpit — < 1.30.0
Weakness (CWE)
CWESourceDescription
CWE-362 cna CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-770 cna CWE-770: Allocation of Resources Without Limits or Throttling
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.9 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
References (2)
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