VulnSocial

CVE-2026-42007Patch

LOWCVSS 9.1 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, and to write memory contents beyond the intended buffer into the delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery, which can crash the delivery process and may allow execution of arbitrary code in the context of that process. Disable the Sieve editheader extension. Update to non-vulnerable version. No publicly available exploits are known.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-416

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 2 signals
  • Technical details provided in 2 signals
  • Peaked 2d ago at 1 mentions (2026-08-29); latest day: 1
  • 3 total mentions across 3 days

Deep dive

Activity timeline3 mentions / 3d
00111Mentions · 2026-08-29: 1Mentions · 2026-09-08: 1Mentions · 2026-10-10: 1Patch / Workaround · 2026-08-29: 1Patch / Workaround · 2026-09-08: 1Technical Details · 2026-08-29: 1Technical Details · 2026-09-08: 108-2909-0810-10
Signal classification1 categories
Patch
2100.0%
Referenced assets3 URLs
Full discourse3 posts
  • Wazuh@wazuh
    Patch

    Dovecot is affected by CVE-2026-42007 (CVSS 9.1 - Critical), a Sieve editheader use-after-free flaw that can crash mail delivery or potentially execute code. Apply vendor updates or disable editheader. Read more: https://ow.ly/7n7P50ZKoyC https://t.co/wNd1cdDorb

    Post summary

    The post announces the CVE‑2026‑42007 critical flaw in Dovecot’s Sieve editheader functionality, notes the vendor has released updates, and recommends disabling editheader as a workaround.

    0901621.1K
    8.3K followersView on X
  • DailyCVE@dailycve

    🔵 (Dovecot), Use-After-Free, #CVE-2026-42007 (Important) -DC-Oct2026-3075 https://dailycve.com/dovecot-use-after-free-cve-2026-42007-important-dc-oct2026-3075/

    0000043
    241 followersView on X
  • ADK Cyber@ADKCyber
    Patch

    CVE-2026-42007 (CVSS 9.1) impacts email servers allowing Sieve scripts. Review exposure and apply updates if using affected mail systems. https://nvd.nist.gov/vuln/detail/CVE-2026-42007 via NVD Recent High CVSS #CyberSecurity #InfoSec #Vulnerability #AI #MachineLearning https://t.co/jdRLiJ54qe

    Post summary

    The tweet highlights CVE‑2026‑42007, a high‑severity flaw affecting email servers using Sieve scripts, and urges users to review exposure and apply available updates.

    0000035
    95 followersView on X

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