CVE-2006-0058: Signal handler race condition in Sendmail 8.13.x before 8.13.6 allows remote attackers to execute arbitrary co

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HIGH 7.6DOWNGRADE

CVE-2006-0058 is a high-severity flaw (CVSS 7.6) affecting sendmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Signal handler race condition in Sendmail 8.13.x before 8.13.6 allows remote attackers to execute arbitrary code by triggering timeouts in a way that causes the setjmp and longjmp function calls to be interrupted and modify unexpected memory locations.

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.6 (High)
EPSS exploit chance	28.7% (top 2%)
CISA exploited list	No
Published	2006-03-22
Last modified	2026-06-16

Publisher (CNA): CERT/CC · Vendor: sendmail

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-03-22 20:06 UTCPublished CVE record published
2026-06-16 22:19 UTCUpdated Record last modified

sendmail sendmail DOWNGRADE

Affected: 8.13.0 · 8.13.1 · 8.13.2 · 8.13.3 · 8.13.4 · 8.13.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.13.0

1. Check installed version

apt-cache policy sendmail || rpm -q sendmail || sendmail --version

2. No fixed release: DOWNGRADE to a release before 8.13.0 (Debian / Ubuntu)

apt-cache madison sendmail sudo apt install sendmail=<VERSION_BEFORE_8.13.0> sudo apt-mark hold sendmail

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sendmail sudo dnf downgrade sendmail-<VERSION_BEFORE_8.13.0> sudo dnf versionlock add sendmail

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Sendmail 8.13.5 - Remote Signal Handling (PoC)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-0058?

sendmail: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0058 being exploited?

CVE-2006-0058 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-0058 affect?

CVE-2006-0058 affects sendmail. Severity is high (CVSS 7.6). Signal handler race condition in Sendmail 8.13.x before 8.13.6 allows remote attackers to execute arbitrary code by triggering timeouts in a way that causes the setjmp and longjmp function calls to be interrupted and modify unexpected memor

How urgent is CVE-2006-0058?

Priority 56/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference

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References

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