CVE-2023-35839: A bypass in the component sofa-hessian of Solon before v2.3.3 allows attackers to execute arbitrary code via p

Q: How do I fix CVE-2023-35839?

solon: upgrade to 2.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2023-35839 being exploited?

CVE-2023-35839 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-35839 affect?

CVE-2023-35839 affects solon. Severity is critical (CVSS 9.8). A bypass in the component sofa-hessian of Solon before v2.3.3 allows attackers to execute arbitrary code via providing crafted payload.

Q: How urgent is CVE-2023-35839?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2023-35839 is a critical-severity flaw (CVSS 9.8) affecting solon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A bypass in the component sofa-hessian of Solon before v2.3.3 allows attackers to execute arbitrary code via providing crafted payload.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-502
Published	2023-06-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: solon

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

Am I affected?

Timeline

2023-06-19 01:15 UTCPublished CVE record published
2026-06-17 06:05 UTCUpdated Record last modified

solon solon UPGRADE

Affected: < 2.3.3

Fixed in: 2.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade solon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade solon

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2023-35839?

solon: upgrade to 2.3.3. Exact commands for each OS are on this page.

Is CVE-2023-35839 being exploited?

CVE-2023-35839 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-2023-35839 affect?

CVE-2023-35839 affects solon. Severity is critical (CVSS 9.8). A bypass in the component sofa-hessian of Solon before v2.3.3 allows attackers to execute arbitrary code via providing crafted payload.

How urgent is CVE-2023-35839?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-46096 MEDIUM 6.1 DOWNGRADE Directory Traversal vulnerability in solon v.3.1.2 allows a remote attacker to conduct XSS attacks via the sol
CVE-2023-48967 CRITICAL 9.8 UPGRADE Ssolon <= 2.6.0 and <=2.5.12 is vulnerable to Deserialization of Untrusted Data.

References

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