CVE-2023-38961: Buffer Overflwo vulnerability in JerryScript Project jerryscript v.3.0.0 allows a remote attacker to execute a

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-38961 is a critical-severity flaw (CVSS 9.8) affecting jerryscript. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer Overflwo vulnerability in JerryScript Project jerryscript v.3.0.0 allows a remote attacker to execute arbitrary code via the scanner_is_context_needed component in js-scanner-until.c.

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	1.5% (top 27%)
CISA exploited list	No
Weakness	CWE-787
Published	2023-08-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jerryscript

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

Am I affected?

Timeline

2023-08-21 17:15 UTCPublished CVE record published
2026-06-17 06:11 UTCUpdated Record last modified

jerryscript jerryscript DOWNGRADE

Affected: 3.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison jerryscript sudo apt install jerryscript=<VERSION_BEFORE_3.0.0> sudo apt-mark hold jerryscript

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

dnf --showduplicates list jerryscript sudo dnf downgrade jerryscript-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add jerryscript

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-2023-38961?

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

Is CVE-2023-38961 being exploited?

CVE-2023-38961 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-2023-38961 affect?

CVE-2023-38961 affects jerryscript. Severity is critical (CVSS 9.8). Buffer Overflwo vulnerability in JerryScript Project jerryscript v.3.0.0 allows a remote attacker to execute arbitrary code via the scanner_is_context_needed component in js-scanner-until.c.

How urgent is CVE-2023-38961?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-33260 MEDIUM 5.1 DOWNGRADE Jerryscript commit cefd391 was discovered to contain a segmentation violation via the component parser_parse_c
CVE-2024-33259 MEDIUM 5.5 DOWNGRADE Jerryscript commit cefd391 was discovered to contain a segmentation violation via the component scanner_seek a
CVE-2024-33258 HIGH 7.1 DOWNGRADE Jerryscript commit ff9ff8f was discovered to contain a segmentation violation via the component vm_loop at jer
CVE-2024-33255 MEDIUM 6.2 DOWNGRADE Jerryscript commit cefd391 was discovered to contain an Assertion Failure via ECMA_STRING_IS_REF_EQUALS_TO_ONE
CVE-2024-29489 MEDIUM 5.5 UPGRADE Jerryscript 2.4.0 has SEGV at ./jerry-core/ecma/base/ecma-helpers.c:238:58 in ecma_get_object_type.

References

← Back to latest CVEs