CVE-2021-46506: There is an Assertion 'v->d.lval != v' failed at src/jsiValue.c in Jsish v3.5.0.

Routine

MEDIUM 5.5DOWNGRADE

CVE-2021-46506 is a medium-severity flaw (CVSS 5.5) affecting jsish. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

There is an Assertion 'v->d.lval != v' failed at src/jsiValue.c in Jsish v3.5.0.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-617
Published	2022-01-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jsish

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

Am I affected?

Timeline

2022-01-27 21:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

jsish jsish DOWNGRADE

Affected: 3.5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.5.0 (Debian / Ubuntu)

apt-cache madison jsish sudo apt install jsish=<VERSION_BEFORE_3.5.0> sudo apt-mark hold jsish

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

dnf --showduplicates list jsish sudo dnf downgrade jsish-<VERSION_BEFORE_3.5.0> sudo dnf versionlock add jsish

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-2021-46506?

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

Is CVE-2021-46506 being exploited?

CVE-2021-46506 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-2021-46506 affect?

CVE-2021-46506 affects jsish. Severity is medium (CVSS 5.5). There is an Assertion 'v->d.lval != v' failed at src/jsiValue.c in Jsish v3.5.0.

How urgent is CVE-2021-46506?

Priority 37/100. Public exploit reference

Related CVEs

CVE-2025-65570 CRITICAL 9.8 DOWNGRADE A type confusion in jsish 2.0 allows incorrect control flow during execution of the OP_NEXT opcode
CVE-2024-24189 CRITICAL 9.8 DOWNGRADE Jsish v3.5.0 (commit 42c694c) was discovered to contain a use-after-free via the SplitChar at ./src/jsiUtils.c
CVE-2024-24188 CRITICAL 9.8 DOWNGRADE Jsish v3.5.0 was discovered to contain a heap-buffer-overflow in ./src/jsiUtils.c.
CVE-2024-24186 CRITICAL 9.8 DOWNGRADE Jsish v3.5.0 (commit 42c694c) was discovered to contain a stack-overflow via the component IterGetKeysCallback
CVE-2021-46507 MEDIUM 5.5 DOWNGRADE Jsish v3.5.0 was discovered to contain a stack overflow via Jsi_LogMsg at src/jsiUtils.c.

References

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