CVE-2019-1010177: Jsish 2.4.70 2.047 is affected by: Use After Free

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2019-1010177 is a critical-severity flaw (CVSS 9.8) affecting jsish. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Jsish 2.4.70 2.047 is affected by: Use After Free. The impact is: denial of service and possibly arbitrary code execution. The component is: function Jsi_RegExpNew (jsi/jsiRegexp.c:39). The attack vector is: executing crafted javascript code. The fixed version is: after commit 48a66c798d.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-416
Published	2019-07-24
Last modified	2026-06-17

Publisher (CNA): DWF · Vendor: jsish

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

Am I affected?

Timeline

2019-07-24 12:15 UTCPublished CVE record published
2026-06-17 02:09 UTCUpdated Record last modified

jsish jsish DOWNGRADE

Affected: 2.4.70_2.047

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.4.70_2.047

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.4.70_2.047 (Debian / Ubuntu)

apt-cache madison jsish sudo apt install jsish=<VERSION_BEFORE_2.4.70_2.047> sudo apt-mark hold jsish

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

dnf --showduplicates list jsish sudo dnf downgrade jsish-<VERSION_BEFORE_2.4.70_2.047> 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-2019-1010177?

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

Is CVE-2019-1010177 being exploited?

CVE-2019-1010177 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-2019-1010177 affect?

CVE-2019-1010177 affects jsish. Severity is critical (CVSS 9.8). Jsish 2.4.70 2.047 is affected by: Use After Free. The impact is: denial of service and possibly arbitrary code execution. The component is: function Jsi_RegExpNew (jsi/jsiRegexp.c:39). The attack vector is: executing crafted javascript cod

How urgent is CVE-2019-1010177?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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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