---
title: "CVE-2026-107161: Cyrus SASL - Buffer Overflow"
description: "Cyrus SASL contains a heap-based buffer overflow caused by incorrect buffer size calculation in the DIGEST-MD5 plugin's add_to_challenge() function, letting malicious or on-path servers crash the client by supplying crafted challenge fields, exploit requires attacker-controlled server."
url: https://panop.io/threat-heartbeat/CVE-2026-107161/
---

# CVE-2026-107161 Cyrus SASL - Buffer Overflow

Cyrus SASL contains a heap-based buffer overflow caused by incorrect buffer size calculation in the DIGEST-MD5 plugin's add\_to\_challenge() function, letting malicious or on-path servers crash the client by supplying crafted challenge fields, exploit requires attacker-controlled server.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.28% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107161)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

7 October 2026

Updated

15 October 2026

Weakness

[CWE-122](https://cwe.mitre.org/data/definitions/122.html)

## Vendor fix

Update to the latest version with the buffer overflow fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107161](https://nvd.nist.gov/vuln/detail/CVE-2026-107161)
- [https://access.redhat.com/security/cve/CVE-2026-107161](https://access.redhat.com/security/cve/CVE-2026-107161)
- [https://bugzilla.redhat.com/show\_bug.cgi?id=2460420](https://bugzilla.redhat.com/show_bug.cgi?id=2460420)
- [http://www.openwall.com/lists/oss-security/2026/10/09/20](http://www.openwall.com/lists/oss-security/2026/10/09/20)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)