CVE-2022-43357: Stack overflow vulnerability in ast_selectors.cpp in function Sass::CompoundSelector::has_real_parent_ref in l

This week

HIGH 7.5REMOTEDOWNGRADEDOWNGRADE

CVE-2022-43357 is a high-severity flaw (CVSS 7.5) affecting libsass, sassc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack overflow vulnerability in ast_selectors.cpp in function Sass::CompoundSelector::has_real_parent_ref in libsass:3.6.5-8-g210218, which can be exploited by attackers to causea denial of service (DoS). Also affects the command line driver for libsass, sassc 3.6.2.

Why this priority

High 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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-787
Published	2023-08-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sass-lang

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

Am I affected?

Timeline

2023-08-22 19:16 UTCPublished CVE record published
2026-06-17 05:06 UTCUpdated Record last modified

sass-lang libsass DOWNGRADE

Affected: 3.6.5-8-g210218

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.6.5-8-g210218

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.6.5-8-g210218 (Debian / Ubuntu)

apt-cache madison libsass sudo apt install libsass=<VERSION_BEFORE_3.6.5-8-g210218> sudo apt-mark hold libsass

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

dnf --showduplicates list libsass sudo dnf downgrade libsass-<VERSION_BEFORE_3.6.5-8-g210218> sudo dnf versionlock add libsass

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.

sass-lang sassc DOWNGRADE

Affected: 3.6.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.6.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.6.2 (Debian / Ubuntu)

apt-cache madison sassc sudo apt install sassc=<VERSION_BEFORE_3.6.2> sudo apt-mark hold sassc

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

dnf --showduplicates list sassc sudo dnf downgrade sassc-<VERSION_BEFORE_3.6.2> sudo dnf versionlock add sassc

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-2022-43357?

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

Is CVE-2022-43357 being exploited?

CVE-2022-43357 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-2022-43357 affect?

CVE-2022-43357 affects libsass, sassc. Severity is high (CVSS 7.5). Stack overflow vulnerability in ast_selectors.cpp in function Sass::CompoundSelector::has_real_parent_ref in libsass:3.6.5-8-g210218, which can be exploited by attackers to causea denial of service (DoS). Also affects the command line drive

How urgent is CVE-2022-43357?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-43358 HIGH 7.5 DOWNGRADE Stack overflow vulnerability in ast_selectors.cpp: in function Sass::ComplexSelector::has_placeholder in libsa
CVE-2022-26592 HIGH 8.8 DOWNGRADE Stack Overflow vulnerability in libsass 3.6.5 via the CompoundSelector::has_real_parent_ref function.

References

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