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TI-2026-80948 Aliases CVE-2026-116739GHSA-qvwh-gpqc-cpp8

Uninitialized stack memory disclosure in VMime uuencode decoder

Priority MEDIUM 57CWE-908Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-908 and the CVSS impact.

Summary

VMime through 0.9.2 contains an information disclosure flaw in the uuEncoder::decode function, which writes uninitialized stack memory into decoded output for over-long lines. Because of uninitialized resource use (CWE-908), an unauthenticated remote attacker can send a crafted uuencode or x-uuencode MIME part with a large line length byte to leak up to 15 bytes of stack contents per line in decoded attachments. The CVSS 4.0 vector requires user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

VMime through 0.9.2 contains an information disclosure vulnerability in the uuEncoder::decode function that writes uninitialized stack memory into decoded output for over-long lines. Attackers can send a crafted uuencode or x-uuencode MIME part with a large line length byte to leak up to 15 bytes of stack contents per line in decoded attachments.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00252 16th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
kislivmimeup to 0.9.2—No fix listedCNA
  • vmime Vendorkisli Affected up to 0.9.2 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for VMime.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-116739
  2. 2026-10-27 Alias added: GHSA-qvwh-gpqc-cpp8
  3. 2026-11-04 CISA SSVC decision points changed
  4. 2026-11-04 Priority changed: LOW → MEDIUM

References

Patch 2

Advisory 1

Other 2

  • TI-2026-80947 Stack-based buffer overflow in VMime uuencode decoder CVSS 4.0HIGH 8.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences