CVE-2019-19796: Yabasic 2.86.2 has a heap-based buffer overflow in myformat in function.c via a crafted BASIC source file.

This month

HIGH 7.8DOWNGRADE

CVE-2019-19796 is a high-severity flaw (CVSS 7.8) affecting yabasic. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Yabasic 2.86.2 has a heap-based buffer overflow in myformat in function.c via a crafted BASIC source file.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-787
Published	2019-12-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yabasic

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-12-13 22:15 UTCPublished CVE record published
2026-06-17 02:27 UTCUpdated Record last modified

yabasic yabasic DOWNGRADE

Affected: 2.86.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.86.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.86.2 (Debian / Ubuntu)

apt-cache madison yabasic sudo apt install yabasic=<VERSION_BEFORE_2.86.2> sudo apt-mark hold yabasic

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

dnf --showduplicates list yabasic sudo dnf downgrade yabasic-<VERSION_BEFORE_2.86.2> sudo dnf versionlock add yabasic

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.

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-2019-19796?

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

Is CVE-2019-19796 being exploited?

CVE-2019-19796 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-2019-19796 affect?

CVE-2019-19796 affects yabasic. Severity is high (CVSS 7.8). Yabasic 2.86.2 has a heap-based buffer overflow in myformat in function.c via a crafted BASIC source file.

How urgent is CVE-2019-19796?

Priority 46/100. High severity; Public exploit reference

Related CVEs

CVE-2019-19720 HIGH 8.8 DOWNGRADE Yabasic 2.86.1 has a heap-based buffer overflow in the yylex() function in flex.c via a crafted BASIC source f

References

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