fetchmail 6.3.5 and 6.3.6 before 6.3.6-rc4, when refusing a message delivered via the mda…
Priority MEDIUM 41CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Complete
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
fetchmail 6.3.5 and 6.3.6 before 6.3.6-rc4, when refusing a message delivered via the mda option, allows remote attackers to cause a denial of service (crash) via unknown vectors that trigger a NULL pointer dereference when calling the (1) ferror or (2) fflush functions.
Why it matters now
EPSS 0.04012 90th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fetchmail:fetchmail:6.3.5:*:*:*:*:*:*:* | 6.3.5 | Vulnerable | fetchmail |
| cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc1:*:*:*:*:*:* | 6.3.6 rc1 | Vulnerable | fetchmail |
| cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc2:*:*:*:*:*:* | 6.3.6 rc2 | Vulnerable | fetchmail |
| cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc3:*:*:*:*:*:* | 6.3.6 rc3 | Vulnerable | fetchmail |
- cpe:2.3:a:fetchmail:fetchmail:6.3.5:*:*:*:*:*:*:* Versions 6.3.5 Vulnerable ·fetchmail
- cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc1:*:*:*:*:*:* Versions 6.3.6 rc1 Vulnerable ·fetchmail
- cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc2:*:*:*:*:*:* Versions 6.3.6 rc2 Vulnerable ·fetchmail
- cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc3:*:*:*:*:*:* Versions 6.3.6 rc3 Vulnerable ·fetchmail
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2006-5974
- 2026-10-03 Alias added: GHSA-qjgr-cmw7-hw63
- 2026-10-07 EPSS moved to the 90th–95th percentile
References
More Fetchmail vulnerabilities
- TI-2001-00964 Fetchmail (aka fetchmail-ssl) before 5.8.17 allows a remote malicious (1) IMAP server or… CVSS 2.0HIGH 10.0
- TI-2001-00101 Vulnerability in fetchmail 5.5.0-2 and earlier in the AUTHENTICATE GSSAPI command. CVSS 2.0HIGH 10.0
- TI-2001-00782 A buffer overflow in Linux fetchmail before 5.8.6 allows remote attackers to execute… CVSS 2.0HIGH 7.5
- TI-2006-05650 fetchmail before 6.3.6-rc4 does not properly enforce TLS and may transmit cleartext… CVSS 2.0HIGH 7.8
- TI-2002-01289 Heap-based buffer overflow in Fetchmail 6.1.3 and earlier does not account for the "@"… CVSS 2.0HIGH 7.5
- TI-2005-04091 fetchmail before 6.3.1 and before 6.2.5.5, when configured for multidrop mode, allows… CVSS 2.0HIGH 7.8
Sources
- CVE-2006-5974 · CVE Program
- CVE-2006-5974 · NVD
- FIRST EPSS
- GHSA-qjgr-cmw7-hw63 · GitHub Advisory Database · CC BY 4.0
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